harinandan KUMAR - Academia.edu (original) (raw)

Papers by harinandan KUMAR

Materials Today: Proceedings

Arabian Journal of Geosciences

Arabian Journal of Geosciences

International Journal of Thin Films Science and Technology, 2021

This study deals with the extensive investigation of Alumina thin film coating deposited on glass... more This study deals with the extensive investigation of Alumina thin film coating deposited on glass, stainless steel, and polycarbonate substrates at 25ºC. The transmittance, reflectance, and surface roughness were determined. Transmittance was observed from 88 to 91 % for alumina thin film coating on glass and polycarbonate substrates. The stiffness, hardness, and elastic modulus were 58, 52, and 47 μN/nm, 7.52, 7.14, 6.87, 103, 112, and 122 GPa thin-film coating on different substrates. An increase in surface roughness and transmittance was observed with sputtering power and the thickness of the coating.

Arabian Journal of Geosciences

International Journal of Materials Engineering Innovation, 2021

The enhancement of optical properties such as transmittance, absorptance, and reflectance is poss... more The enhancement of optical properties such as transmittance, absorptance, and reflectance is possible by applying selective metal and ceramic coatings to the surfaces. Aluminium oxide coatings have potential advantages in this regard. The coating is used for passivation, wear resistance, anti-reflection purpose, etc. in combination with other materials. The aluminium-based coating characteristics include transmittance, reflectance, absorptance, surface roughness, etc. depending on the type of deposition method, operating principles involved, and working conditions maintained during the deposition process. In this study, aluminium and alumina thin films of different thicknesses were deposited on borosilicate glass substrates using thermal evaporation, E-beam, and sputtering method with a substrate temperature from 25°C to 100°C. The optical properties like transmittance, reflectance, and absorptance were evaluated for the thin film coating. The surface roughness of the thin film was also analysed. The Rrms values of aluminium and alumina thin films deposited using thermal evaporation and sputtering process with a coating thickness from 100 nm to 300 nm varied from 2 to 5 nm and 1 nm. An increase in reflectance of aluminium coatings was observed with surface roughness.

Hybrid Fiber Composites, 2020

Journal of Engineering Science and Technology Review, 2018

Arabian Journal of Geosciences, 2021

The feasibility of oil production in any reservoir depends on the porosity and the permeability o... more The feasibility of oil production in any reservoir depends on the porosity and the permeability of that reservoir. Particularly, the permeability in the reservoir allows the ease of flow of fluid through it. High permeability is always desirable for the successful production of oil in any reservoir. The porosity and permeability depend on the reservoir rock. In general, the higher value of porosity and permeability makes limestone a suitable reservoir. Therefore, it is very important to characterize the reservoir in terms of porosity and permeability for the feasibility of oil production. In this investigation, reservoir characterization was carried out to determine the porosity and permeability of limestone reservoirs obtained from four different basins of Oilmax Mumbai. A total of 32 core samples of NX size were tested for characterization and determined porosity and permeability values. The variation in porosity and permeability was observed from 0.3 to 20.5% and 0.002 to 1.484 m...

Coal bed methane (CBM) is considered as unconventional gas, and plays an important role in fulfil... more Coal bed methane (CBM) is considered as unconventional gas, and plays an important role in fulfilling the future energy supply as well as repositories for CO2 storage. The recovery of methane is a promising technology to meet a part of the growing energy demand. CBM is considered as clean source with minor amounts of carbon dioxide which is 117 lb/MBtu as compared to coal which produce 228.6 lb/MBtu, though its occurrence and extraction poses many challenges. CBM production from coalbed reservoir is typically initiated using water depletion method. This method reduces the pressure in coal bed as water is pumped out from the reservoir. Reduction in pressure in coal bed reservoir leads to desorption of gas from the coal matrix and flow in to the production well. Desorption of methane produces voids in coal matrix that facilitate repositories for CO2 storage. The commercial and economic extraction of methane and sequestration of CO2 depends on the various parameters of the coal seam in...

Journal of Petroleum Exploration and Production, 2021

Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques use... more Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques used to evaluate cement-casing-formation bonds before the well testing or execution of the production operation in the well. These logs are also crucial during the workover operation to maintain the integrity of the well. The logging techniques provide a clear view of the quality of cement bonds with casing and formation. The microannulus and other deviations in bonding between the cement and the casing or formation are recorded using this technique. Therefore, this technique is used by the regulatory authorities worldwide for the determination of the cement bond with casing and formation. In this paper, the CBL/VDL logging technique was used to determine the bonding between cement and casing and cement and formation at two different CBM wells from 850 to 1600 m depths in the Raniganj block of Durgapur, West Bengal. Two well, namely, A and B, were analyzed to determine the cement-casing-for...

International Conference on Advances in Agricultural, Biological & Environmental Sciences (AABES-2015) July 22-23, 2015 London(UK), 2015

India is the third largest coals producing country in the world. Estimation indicates the coal re... more India is the third largest coals producing country in the world. Estimation indicates the coal reserve is about 522 BT and CBM magnitude is of 4.6 TCM. CBM is one of the proved clean energy resources with heating value of approximately 8500 KCal/kg. CBM is future hope for energy demand in India and worldwide. But successful exploitation of coal bed methane needs advance knowledge of the coal and its behavior at varying condition. Estimation and evaluation of geo-mechanical properties of the coal and coal matrix has a direct relationship with CBM production. It is related to the in situ stress, lateral strain, axial strain, Poisson's ratio, young's modulus, bulk modulus, shear modulus etc. The measurement of geo-mechanical parameters using laboratory experiments are expensive and quite time taking. The coal from deep mines contains higher percentage of carbon and hence fragile in nature. Many a times, it is very tough to get sample of desire size to test for specific properties. This is why the ultrasonic testing is frequently employed to resolve and characterize the dynamic properties of coal. The P-wave velocity is closely related to the intact coal. Present paper discussed about dynamic properties and petrographic analysis of some coal samples from Jharia coalfield India. Correlation of geo-mechanical parameters with P-wave velocity and petrographic analysis results was also discussed due to its greater applicability in CBM evaluation and production. Statistical technique was employed to analyze the results for the credibly of the findings.

Journal of Petroleum Exploration and Production Technology, 2019

The establishment of oil production well is becoming a challenge with the increasing demand for e... more The establishment of oil production well is becoming a challenge with the increasing demand for energy. The fulfillment of energy need requires large production of oil and gas as it is a primary source of energy. EOR is also important because of the enhancement in oil production from thirty percent to more than fifty percent. The chemical EOR is one of the techniques for the increment in oil production. Chemical flooding using water-soluble polymers like partially hydrolyzed polyacrylamide (PHPA) has been industrially used as an EOR technique. The paper deals with the effect of nano-silica particles on viscosity as well as the shear rate of the polymer solution. The change in viscosity, as well as shear rate, was studied at variable concentrations of the nano particles in the different concentrations of PHPA solution. Mutual correlation between viscosity and other parameters like temperature, shear rate, salinity, nanoparticle concentration, and polymer concentration was established...

Air Quality, Atmosphere & Health, 2019

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2019

Geophysico-mechanical characterization of coal data are important in the economic success of CH 4... more Geophysico-mechanical characterization of coal data are important in the economic success of CH 4 extraction as well as a CO 2 injection in deep coal seam reservoir. The heterogeneous nature of coal makes the CH 4 removal quite challenging because of the complex behaviour of the seam at in situ as well as applied stress level. Coal matrix behaviour depends on several parameters as permeability, porosity, pore pressure, gas content, structural features, etc. plays a leading role in methane extraction. Therefore, extensive laboratory investigation is handiest approached to anticipate the behavior of coal effectively. This paper presents the results of coal characterization, gas permeability, adsorption/desorption capacity of coal as well as the performance of CBM production well in the replicated model of JH-MD-XVI-T coal seam at a depth of 580 m. The coal characterization was determined to evaluate the prospects of methane in the study area. The gas permeability was determined in a triaxial experimental set up using Darcy's approach to in situ conditions. The decrease in permeability with an increase in confining as well as gas pressure was observed in all coal samples due to the crushing of grain, coal deformation and narrowing of fractures as well as cleats leading to hinder the flow of fluid through it. The well performance was evaluated to determine the gas rate as well as cumulative gas volume over twenty-five years of well life. Mutual relation between permeability, in situ confining pressure as well as gas pressure, has been established statistically.

Arabian Journal for Science and Engineering, 2019

The multilayer thin film coatings are one of the proven technologies for improvement in solar the... more The multilayer thin film coatings are one of the proven technologies for improvement in solar thermal and optical applications. In current solar thermal and optical systems, multilayer thin film coatings find application in many functions such as photovoltaics, heat exchangers, filters, sensor technologies, laser windows, mirrors, reflectors and optics for digital projections. The solar absorptance and thermal emittance of the multilayer thin film coatings are one of the leading factors for its applicability in said areas. The processing conditions, morphology and surface finish influence the solar absorptance and thermal emittance behavior of multilayer thin film coating. Therefore, emphasis has given in this paper to deposit multilayer thin film coatings with an increased solar absorptance and decreased thermal emittance to improve its applicability in solar thermal applications. Multilayer thin film coatings (Al 2 O 3 /Ni/W-Al 2 O 3 /W) were deposited using DC/RF magnetron sputtering on the stainless steel substrate to improve its applicability in solar thermal receiver tube for power generation. The performance of this multilayer thin film was investigated by measuring the absorptance and emittance using 410 Solar and ET 100 in the solar spectrum region at a variable incident angle from 20° to 60°. The effect of optical properties, microstructure and morphology of the multilayer thin film coatings was also investigated. The maximum absorptance 0.92 and minimum emittance < 0.1 were observed in deposited multilayer thin film coating with the combination of Tungsten, Al 2 O 3 and Nickel, respectively. The observed values indicate the practical applicability of the multilayer coatings in medium-tohigh-temperature range of solar thermal receiver tubes.

Journal of Petroleum Exploration and Production Technology, 2019

The study of gas sorption characteristics is important for practical assessment of coal bed metha... more The study of gas sorption characteristics is important for practical assessment of coal bed methane (CBM) production and CO 2 sequestration in coal seam. Adsorption isotherm is one of the critical parameters for the establishment of production as well as injection well. Adsorption isotherm provides information about the reservoir conditions and critical desorption pressure as well as volume of gas that can be sequestered in deep coal seam. Alteration in sorption isotherm reflects the increase or decrease of the gas production as well as CO 2 sequestration. Therefore, in this paper, experimental investigation was carried out to determine the CO 2 /CH 4 sorption capacity of five different coal samples taken from different locations of Jharia coalfield (Moonidih area) of Gondwana basin. Gas sorption capacity was determined at 27 °C temperature and up to 7.5 MPa pressure. CO 2 adsorption was observed to be higher than that of the CH 4. The sorption ratio of CO 2 /CH 4 varied from 1.6:1 to 1.2:1 for all coal samples. Furthermore, the experimental results were correlated using established Langmuir, Freundlich, Temkin and D-R isotherm models. Experimentally obtained values satisfactorily fitted to the Langmuir and Freundlich model with comparable accuracy. The excess adsorption capacity of coal was also compared with different rank parameters to understand the variation of sorption capacity with rank of coal.

Silicon, 2019

The manufacturing of the composite material has been developed tremendously over the years due to... more The manufacturing of the composite material has been developed tremendously over the years due to its superior properties like low density, stiffness, lightweight and excellent mechanical as well as physical properties. These exceptional properties of composite materials have found its applications widely in aerospace, automotive, marine and many more engineering areas. The synthesis of the varieties of composites is continuously lookout without compromising its mechanical and physical properties. This paper deals in with synthesis as well as mechanical properties (Tensile Strength, Flexural Properties and Fatigue) of Glass-Epoxy as well as Glass-Vinyl Ester composites. The resins used in combination of composites were epoxy as well as Vinyl Ester while the reinforced material was glass fibers. The ultimate tensile strength in Glass-Epoxy composite was observed from 330 to 370 MPa while it was 270 to 330 MPa for Glass-Vinyl Ester Composites. Glass-Epoxy composites showed a 32% increase in flexural strength due to post-curing strength while it was 16% in case of Glass-Vinyl Ester Composites. The results of the fatigue analysis of composites indicate faster growth of cracks and defects at higher frequencies which results in a rapid drop in stress levels in the test specimen. The statistical analysis was carried out to establish mutual correlation among mechanical as well as physical properties.

Journal of Petroleum Exploration and Production Technology, 2018

Gas permeability is an important characteristic of coal seam(s) to determine the economic success... more Gas permeability is an important characteristic of coal seam(s) to determine the economic success of CH 4 extraction and CO 2 sequestration. There exists no comprehensive approach to predict the mechanical behaviour during CH 4 extraction, and CO 2 sequestration as coal is highly heterogeneous. Exhaustive laboratory experimentation is often the only approach to successfully predict its behaviour. Coal experiences triaxial stress conditions when change of force field occurs. This paper presents the mechanical properties and change in gas permeability at varying confining as well as gas pressures in a triaxial experimental setup using Darcy's approach. Mutual relations between permeability, in situ confining pressure as well as gas pressure have been established statistically. A reservoir simulation investigation has been carried out to predict the rate of coal bed methane (CBM) production and the cumulative amount of CBM over the 5-year life of production well. Keywords CBM • Proximate and ultimate analysis • Mechanical properties • Permeability • Reservoir simulation List of symbols M Moisture content A Ash content VM Volatile matter FC Fixed carbon VM (d) Volatile matter (dry basis) FC (d) Fixed carbon (dry basis) VM (daf) Volatile matter (dry ash-free basis) FC (daf) Fixed carbon (dry ash-free basis) C Carbon H Hydrogen N Nitrogen S Sulphur HC ratio Hydrogen carbon ratio R 0 Vitrinite reflectance UCS Uniaxial compressive strength E Elastic modulus K Bulk modulus G Modulus of rigidity µ Poisson's ratio

Materials Today: Proceedings

Arabian Journal of Geosciences

Arabian Journal of Geosciences

International Journal of Thin Films Science and Technology, 2021

This study deals with the extensive investigation of Alumina thin film coating deposited on glass... more This study deals with the extensive investigation of Alumina thin film coating deposited on glass, stainless steel, and polycarbonate substrates at 25ºC. The transmittance, reflectance, and surface roughness were determined. Transmittance was observed from 88 to 91 % for alumina thin film coating on glass and polycarbonate substrates. The stiffness, hardness, and elastic modulus were 58, 52, and 47 μN/nm, 7.52, 7.14, 6.87, 103, 112, and 122 GPa thin-film coating on different substrates. An increase in surface roughness and transmittance was observed with sputtering power and the thickness of the coating.

Arabian Journal of Geosciences

International Journal of Materials Engineering Innovation, 2021

The enhancement of optical properties such as transmittance, absorptance, and reflectance is poss... more The enhancement of optical properties such as transmittance, absorptance, and reflectance is possible by applying selective metal and ceramic coatings to the surfaces. Aluminium oxide coatings have potential advantages in this regard. The coating is used for passivation, wear resistance, anti-reflection purpose, etc. in combination with other materials. The aluminium-based coating characteristics include transmittance, reflectance, absorptance, surface roughness, etc. depending on the type of deposition method, operating principles involved, and working conditions maintained during the deposition process. In this study, aluminium and alumina thin films of different thicknesses were deposited on borosilicate glass substrates using thermal evaporation, E-beam, and sputtering method with a substrate temperature from 25°C to 100°C. The optical properties like transmittance, reflectance, and absorptance were evaluated for the thin film coating. The surface roughness of the thin film was also analysed. The Rrms values of aluminium and alumina thin films deposited using thermal evaporation and sputtering process with a coating thickness from 100 nm to 300 nm varied from 2 to 5 nm and 1 nm. An increase in reflectance of aluminium coatings was observed with surface roughness.

Hybrid Fiber Composites, 2020

Journal of Engineering Science and Technology Review, 2018

Arabian Journal of Geosciences, 2021

The feasibility of oil production in any reservoir depends on the porosity and the permeability o... more The feasibility of oil production in any reservoir depends on the porosity and the permeability of that reservoir. Particularly, the permeability in the reservoir allows the ease of flow of fluid through it. High permeability is always desirable for the successful production of oil in any reservoir. The porosity and permeability depend on the reservoir rock. In general, the higher value of porosity and permeability makes limestone a suitable reservoir. Therefore, it is very important to characterize the reservoir in terms of porosity and permeability for the feasibility of oil production. In this investigation, reservoir characterization was carried out to determine the porosity and permeability of limestone reservoirs obtained from four different basins of Oilmax Mumbai. A total of 32 core samples of NX size were tested for characterization and determined porosity and permeability values. The variation in porosity and permeability was observed from 0.3 to 20.5% and 0.002 to 1.484 m...

Coal bed methane (CBM) is considered as unconventional gas, and plays an important role in fulfil... more Coal bed methane (CBM) is considered as unconventional gas, and plays an important role in fulfilling the future energy supply as well as repositories for CO2 storage. The recovery of methane is a promising technology to meet a part of the growing energy demand. CBM is considered as clean source with minor amounts of carbon dioxide which is 117 lb/MBtu as compared to coal which produce 228.6 lb/MBtu, though its occurrence and extraction poses many challenges. CBM production from coalbed reservoir is typically initiated using water depletion method. This method reduces the pressure in coal bed as water is pumped out from the reservoir. Reduction in pressure in coal bed reservoir leads to desorption of gas from the coal matrix and flow in to the production well. Desorption of methane produces voids in coal matrix that facilitate repositories for CO2 storage. The commercial and economic extraction of methane and sequestration of CO2 depends on the various parameters of the coal seam in...

Journal of Petroleum Exploration and Production, 2021

Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques use... more Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques used to evaluate cement-casing-formation bonds before the well testing or execution of the production operation in the well. These logs are also crucial during the workover operation to maintain the integrity of the well. The logging techniques provide a clear view of the quality of cement bonds with casing and formation. The microannulus and other deviations in bonding between the cement and the casing or formation are recorded using this technique. Therefore, this technique is used by the regulatory authorities worldwide for the determination of the cement bond with casing and formation. In this paper, the CBL/VDL logging technique was used to determine the bonding between cement and casing and cement and formation at two different CBM wells from 850 to 1600 m depths in the Raniganj block of Durgapur, West Bengal. Two well, namely, A and B, were analyzed to determine the cement-casing-for...

International Conference on Advances in Agricultural, Biological & Environmental Sciences (AABES-2015) July 22-23, 2015 London(UK), 2015

India is the third largest coals producing country in the world. Estimation indicates the coal re... more India is the third largest coals producing country in the world. Estimation indicates the coal reserve is about 522 BT and CBM magnitude is of 4.6 TCM. CBM is one of the proved clean energy resources with heating value of approximately 8500 KCal/kg. CBM is future hope for energy demand in India and worldwide. But successful exploitation of coal bed methane needs advance knowledge of the coal and its behavior at varying condition. Estimation and evaluation of geo-mechanical properties of the coal and coal matrix has a direct relationship with CBM production. It is related to the in situ stress, lateral strain, axial strain, Poisson's ratio, young's modulus, bulk modulus, shear modulus etc. The measurement of geo-mechanical parameters using laboratory experiments are expensive and quite time taking. The coal from deep mines contains higher percentage of carbon and hence fragile in nature. Many a times, it is very tough to get sample of desire size to test for specific properties. This is why the ultrasonic testing is frequently employed to resolve and characterize the dynamic properties of coal. The P-wave velocity is closely related to the intact coal. Present paper discussed about dynamic properties and petrographic analysis of some coal samples from Jharia coalfield India. Correlation of geo-mechanical parameters with P-wave velocity and petrographic analysis results was also discussed due to its greater applicability in CBM evaluation and production. Statistical technique was employed to analyze the results for the credibly of the findings.

Journal of Petroleum Exploration and Production Technology, 2019

The establishment of oil production well is becoming a challenge with the increasing demand for e... more The establishment of oil production well is becoming a challenge with the increasing demand for energy. The fulfillment of energy need requires large production of oil and gas as it is a primary source of energy. EOR is also important because of the enhancement in oil production from thirty percent to more than fifty percent. The chemical EOR is one of the techniques for the increment in oil production. Chemical flooding using water-soluble polymers like partially hydrolyzed polyacrylamide (PHPA) has been industrially used as an EOR technique. The paper deals with the effect of nano-silica particles on viscosity as well as the shear rate of the polymer solution. The change in viscosity, as well as shear rate, was studied at variable concentrations of the nano particles in the different concentrations of PHPA solution. Mutual correlation between viscosity and other parameters like temperature, shear rate, salinity, nanoparticle concentration, and polymer concentration was established...

Air Quality, Atmosphere & Health, 2019

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2019

Geophysico-mechanical characterization of coal data are important in the economic success of CH 4... more Geophysico-mechanical characterization of coal data are important in the economic success of CH 4 extraction as well as a CO 2 injection in deep coal seam reservoir. The heterogeneous nature of coal makes the CH 4 removal quite challenging because of the complex behaviour of the seam at in situ as well as applied stress level. Coal matrix behaviour depends on several parameters as permeability, porosity, pore pressure, gas content, structural features, etc. plays a leading role in methane extraction. Therefore, extensive laboratory investigation is handiest approached to anticipate the behavior of coal effectively. This paper presents the results of coal characterization, gas permeability, adsorption/desorption capacity of coal as well as the performance of CBM production well in the replicated model of JH-MD-XVI-T coal seam at a depth of 580 m. The coal characterization was determined to evaluate the prospects of methane in the study area. The gas permeability was determined in a triaxial experimental set up using Darcy's approach to in situ conditions. The decrease in permeability with an increase in confining as well as gas pressure was observed in all coal samples due to the crushing of grain, coal deformation and narrowing of fractures as well as cleats leading to hinder the flow of fluid through it. The well performance was evaluated to determine the gas rate as well as cumulative gas volume over twenty-five years of well life. Mutual relation between permeability, in situ confining pressure as well as gas pressure, has been established statistically.

Arabian Journal for Science and Engineering, 2019

The multilayer thin film coatings are one of the proven technologies for improvement in solar the... more The multilayer thin film coatings are one of the proven technologies for improvement in solar thermal and optical applications. In current solar thermal and optical systems, multilayer thin film coatings find application in many functions such as photovoltaics, heat exchangers, filters, sensor technologies, laser windows, mirrors, reflectors and optics for digital projections. The solar absorptance and thermal emittance of the multilayer thin film coatings are one of the leading factors for its applicability in said areas. The processing conditions, morphology and surface finish influence the solar absorptance and thermal emittance behavior of multilayer thin film coating. Therefore, emphasis has given in this paper to deposit multilayer thin film coatings with an increased solar absorptance and decreased thermal emittance to improve its applicability in solar thermal applications. Multilayer thin film coatings (Al 2 O 3 /Ni/W-Al 2 O 3 /W) were deposited using DC/RF magnetron sputtering on the stainless steel substrate to improve its applicability in solar thermal receiver tube for power generation. The performance of this multilayer thin film was investigated by measuring the absorptance and emittance using 410 Solar and ET 100 in the solar spectrum region at a variable incident angle from 20° to 60°. The effect of optical properties, microstructure and morphology of the multilayer thin film coatings was also investigated. The maximum absorptance 0.92 and minimum emittance < 0.1 were observed in deposited multilayer thin film coating with the combination of Tungsten, Al 2 O 3 and Nickel, respectively. The observed values indicate the practical applicability of the multilayer coatings in medium-tohigh-temperature range of solar thermal receiver tubes.

Journal of Petroleum Exploration and Production Technology, 2019

The study of gas sorption characteristics is important for practical assessment of coal bed metha... more The study of gas sorption characteristics is important for practical assessment of coal bed methane (CBM) production and CO 2 sequestration in coal seam. Adsorption isotherm is one of the critical parameters for the establishment of production as well as injection well. Adsorption isotherm provides information about the reservoir conditions and critical desorption pressure as well as volume of gas that can be sequestered in deep coal seam. Alteration in sorption isotherm reflects the increase or decrease of the gas production as well as CO 2 sequestration. Therefore, in this paper, experimental investigation was carried out to determine the CO 2 /CH 4 sorption capacity of five different coal samples taken from different locations of Jharia coalfield (Moonidih area) of Gondwana basin. Gas sorption capacity was determined at 27 °C temperature and up to 7.5 MPa pressure. CO 2 adsorption was observed to be higher than that of the CH 4. The sorption ratio of CO 2 /CH 4 varied from 1.6:1 to 1.2:1 for all coal samples. Furthermore, the experimental results were correlated using established Langmuir, Freundlich, Temkin and D-R isotherm models. Experimentally obtained values satisfactorily fitted to the Langmuir and Freundlich model with comparable accuracy. The excess adsorption capacity of coal was also compared with different rank parameters to understand the variation of sorption capacity with rank of coal.

Silicon, 2019

The manufacturing of the composite material has been developed tremendously over the years due to... more The manufacturing of the composite material has been developed tremendously over the years due to its superior properties like low density, stiffness, lightweight and excellent mechanical as well as physical properties. These exceptional properties of composite materials have found its applications widely in aerospace, automotive, marine and many more engineering areas. The synthesis of the varieties of composites is continuously lookout without compromising its mechanical and physical properties. This paper deals in with synthesis as well as mechanical properties (Tensile Strength, Flexural Properties and Fatigue) of Glass-Epoxy as well as Glass-Vinyl Ester composites. The resins used in combination of composites were epoxy as well as Vinyl Ester while the reinforced material was glass fibers. The ultimate tensile strength in Glass-Epoxy composite was observed from 330 to 370 MPa while it was 270 to 330 MPa for Glass-Vinyl Ester Composites. Glass-Epoxy composites showed a 32% increase in flexural strength due to post-curing strength while it was 16% in case of Glass-Vinyl Ester Composites. The results of the fatigue analysis of composites indicate faster growth of cracks and defects at higher frequencies which results in a rapid drop in stress levels in the test specimen. The statistical analysis was carried out to establish mutual correlation among mechanical as well as physical properties.

Journal of Petroleum Exploration and Production Technology, 2018

Gas permeability is an important characteristic of coal seam(s) to determine the economic success... more Gas permeability is an important characteristic of coal seam(s) to determine the economic success of CH 4 extraction and CO 2 sequestration. There exists no comprehensive approach to predict the mechanical behaviour during CH 4 extraction, and CO 2 sequestration as coal is highly heterogeneous. Exhaustive laboratory experimentation is often the only approach to successfully predict its behaviour. Coal experiences triaxial stress conditions when change of force field occurs. This paper presents the mechanical properties and change in gas permeability at varying confining as well as gas pressures in a triaxial experimental setup using Darcy's approach. Mutual relations between permeability, in situ confining pressure as well as gas pressure have been established statistically. A reservoir simulation investigation has been carried out to predict the rate of coal bed methane (CBM) production and the cumulative amount of CBM over the 5-year life of production well. Keywords CBM • Proximate and ultimate analysis • Mechanical properties • Permeability • Reservoir simulation List of symbols M Moisture content A Ash content VM Volatile matter FC Fixed carbon VM (d) Volatile matter (dry basis) FC (d) Fixed carbon (dry basis) VM (daf) Volatile matter (dry ash-free basis) FC (daf) Fixed carbon (dry ash-free basis) C Carbon H Hydrogen N Nitrogen S Sulphur HC ratio Hydrogen carbon ratio R 0 Vitrinite reflectance UCS Uniaxial compressive strength E Elastic modulus K Bulk modulus G Modulus of rigidity µ Poisson's ratio