vivek khond - Academia.edu (original) (raw)

Papers by vivek khond

Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use o... more Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use of micro-channel condenser is common in refrigeration and air conditioning industry. Feature of compactness and relatively less weight makes it more suitable for automotive application. Comparison with conventional condenser has shown that performance was high in terms of more COP and improved refrigeration effect. The problem of air mal-distribution effect which was common in air conditioning was reduced with proper modifications. The shape of port of micro-channel condenser had effect on performance of overall system and condenser.

Effect of nanofluid additive and after treatment devices on engine emission - A review

Journal of Physics: Conference Series, 2021

This research paper summaries the research carried by various researcher in the field of Nanofuid... more This research paper summaries the research carried by various researcher in the field of Nanofuids and after treatment devices on performance and emission of CI engines. Basically there are two methods of reducing the emission in the engines. First method is completely burn the fuel i.e. converting hydrocarbon and eliminating the emission. Suppose if the fuel is not completely combustible and it produces emission but it can be reduced by treating it before it enter the atmosphere, this is another way of reducing exhaust emission. The major exhaust emission are NOx and PM i.e. particulate matter. It is evident from many research papers that combustion can be improved by adding Nano additives to reduce the emission. Researcher have used various nano particle of various size and material to improve the performance of the engine and reduce emission. Also they have used various after treatment device reduce emission.

Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use o... more Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use of micro-channel condenser is common in refrigeration and air conditioning industry. Feature of compactness and relatively less weight makes it more suitable for automotive application. Comparison with conventional condenser has shown that performance was high in terms of more COP and improved refrigeration effect. The problem of air mal-distribution effect which was common in air conditioning was reduced with proper modifications. The shape of port of micro-channel condenser had effect on performance of overall system and condenser. Keywords-Micro-channel condenser, vapor compression refrigeration system, COP, Maldistribution.

Experimental investigation of CI engine performance characteristics fuelled with diesel-neem biodiesel blend (D75NB25) with addition of nano iron oxide, silicon dioxide and zinc oxide fuel additive

An overview of use of nanofluid additives in compression ignition engine fuels (diesel and biodiesel)

International Journal of Renewable Energy Research, 2015

Abstract— Recent developments in nanotechnology are useful in many areas of engineering and scien... more Abstract— Recent developments in nanotechnology are useful in many areas of engineering and science. The use of nano fluid additives in compression ignition engines (CI) is one of the emerging areas. Because, fuel consumption and emissions are growing concern in compression ignition engines. The biodiesel fuelled CI engine emits more oxides of nitrogen and smoke. It also consumes more fuel. The objectives of the paper are to critically review the results of recent research papers on nano fluid additives in CI engines. It also reports the comparative analysis of evaporation, performances and emissions characteristic using various nano fluid additives in CI engines. It analyses the effect on properties, method of nano fluid preparation, composition of base fuel (diesel and biodiesel) and suspension stability. It is concluded that various nano particles like metal and metal oxides and carbon based materials can be successfully used in CI engine fuels. It is concluded that nano fluid ad...

Performance evaluation of PV-TEC coupling device for power production with improved hybrid nanocarbon based thermal material interface

Energy Reports, 2021

Abstract The waste heat harnessing from photovoltaic module (PV) with the thermoelectric device (... more Abstract The waste heat harnessing from photovoltaic module (PV) with the thermoelectric device (TE) is considered as an ideal solution for effective thermal management of PV technologies. However, idealized operating conditions for lossless device coupling and reduction in thermal contact resistance need to be investigated further to expedite PV-TE device efficiency. Our simple approach to tandemly attach a low-cost thermoelectric cooling device (TEC) to PV module has improved its power output and electrical efficiency by 1.02% and 1.1% respectively (No. of TEC device-1, 720 W/m2 and 20 °C of water-cooling). Herein, we explored the TEC device for power production as a cost-effective alternative to the traditional thermoelectric (TEG) devices. To facilitates the facile heat transport among the PV-TEC interface, the thermal interface material (TIM) has been applied on TEC devices. The hybridized paste of nanocarbon and thermal grease (NC-TG) was used as a TIM material, morphologically evident the linear alignment between NC in TG matrix has ameliorated the uniform heat conduction. It was observed that the application of hybrid Carbon TIM materials enhances the power generation by 10.65% compared to PV-TG-TEC. The physicochemical analysis and evaluation results indicated that the low-cost synthesized hybrid carbon-based TIM material is efficient in the reduction of thermal contact resistance. Concomitantly, the high heat absorption capacity of nanocarbon accelerated the TEC performance by creating a sufficient temperature gradient across TEC ends. The present work proposed a simple and low-cost pathway for the improvement of TEC performance using hybrid carbon-based TIM material.

SN Applied Sciences, 2021

The performance of heat transfer enhancement (HTE) using modified inserts (MIs) as a vortex gener... more The performance of heat transfer enhancement (HTE) using modified inserts (MIs) as a vortex generator in pipe flow and fluid flow analysis using computational fluid dynamics (CFD) are evaluated in this article. The MIs are fastened to the central rod, and the circular sections of the MIs touched the circular wall of the test pipe. Heat transfer and fluid flow analyses are carried out for the various pitch to diameter ratios (P/D) and angles of the MIs. P/D ratios of 3, 4 and 6 and MIs angles of 15°, 30°, 45°, 60° and 90° are considered for experimental analysis. CFD analysis is carried out for P/D ratios of 3, 4 and 6 and MIs angles of 30°, 45° and 90°. Nusselt number (Nu/Nus) and friction factor (f/fs) ratios are evaluated using the same Reynolds number between 8000 and 17,000 in the experimental study. The MIs encourage the wall and core fluid to be combined thus helps in HTE. It is found that, as the P/D ratio increases, the Nu/Nus and f/fs decrease. If the distance between the M...

New diesel-neem biodiesel blend (D75NB25) containing nano iron oxide, silicon dioxide and zinc oxide for diesel engine: An experimental investigation

Materials Today: Proceedings, 2021

Experimental analysis, modelling of evaporation and ignition characteristics of different biodiesels using RSM

Materials Today: Proceedings, 2021

Abstract In this work, the droplet evaporation rate and ignition probability of biodiesel of neem... more Abstract In this work, the droplet evaporation rate and ignition probability of biodiesel of neem and karanja were investigated and modelled using RSM. The biodiesel from neem and karanja oil were prepared using trasesterification. Thermo-physical properties of fuels was tested. Further, a test rig was fabricated to find out the rate of evaporation of fuel droplet as well as the ignition probability of the biodiesel and comparison was done so as to find out the feasibility for combustion application. It was concluded that the ignition probability and evaporation rate of karanja biodiesel was better than neem biodiesel. Also, evaporation rate and ignition probability above critical surface temperature (450 °C) drastically increased for all fuel. The model of ER and IP was found statistically significant and predict responses accurately at any surface temperature.

Experimental investigation and modeling of the evaporation rate of carbon nanotube blended emulsified Neem biodiesel

Biofuels, 2017

ABSTRACT Neem biodiesel is an abundant fuel in India. However, the higher viscosity and lower cal... more ABSTRACT Neem biodiesel is an abundant fuel in India. However, the higher viscosity and lower calorific value result in a lower evaporation rate, hence limiting its use in combustion applications. The evaporation rate of fuel plays a very important role in combustion reactions. An improvement in evaporation rate can be achieved using nanoparticles in Neem biodiesel. The present investigation was carried out to determine the evaporation characteristics of carbon nanotube suspended Neem biodiesel with different dosing ratios of nanoparticles with and without water. An improvement in evaporation rate with addition of carbon nanotubes was seen in Neem biodiesel. An improvement in calorific value and cetane number was obtained. It can be concluded that an increase in nanoparticle concentration results in an enhancement in evaporation rate. A regression model was developed and found to be statistically significant.

Renewable and Sustainable Energy Reviews, 2016

Mechanics, 2016

A -total heat transfer surface area,m 2 ; Cp -specific heat, J/(kg K); Dc -tube outside diameter,... more A -total heat transfer surface area,m 2 ; Cp -specific heat, J/(kg K); Dc -tube outside diameter, m; Dh -hydraulic diameter, m; f -friction factor; h -heat transfer coefficient, W/(m 2 K); k -thermal conductivity, W/(m 2 K); N -number of tube row; Nu -Nusselt number; mf -mass flow rate, kg/s; ΔP -pressure drop, Pa;

Researchers look for new source of fuel alternating to the petrol and diesel, petrol and diesel a... more Researchers look for new source of fuel alternating to the petrol and diesel, petrol and diesel are very expensive in the world, alternating fuel must be renewable, locally available and environmentally benign. From the alternative source, the significance of biodiesel fuel as technically and commercially viable alternative to petrol and diesel fuel. Depending on the availability of the different stocks biodiesel is made. Due to water emulsified in biodiesel fuel there is increase in ignition probability. This paper contains literature survey which provides reduction in NOx and carbon dioxide using emulsified biodiesel instead of petrol fuel. By adding additives in emulsified biodiesel performance of engine should be increases.

Comparative Analysis of Twin Cylinder C.I. Engine Fueled with Diesel and Preheated Karanj Oil

SAE Technical Paper Series, 2013

American Journal of Scientific and Industrial Research, 2011

Evaporative cooling is a very common form of cooling buildings for thermal comfort since it is re... more Evaporative cooling is a very common form of cooling buildings for thermal comfort since it is relatively cheap and requires less energy than many other forms of cooling. However evaporative cooling requires an abundant water source as an evaporate, and is only efficient when the relative humidity is low, restricting its effective use to dry climates. Traditionally, evaporative cooler pads consist of excelsior (wood wool) inside containment net. Padding media plays a large part in cooling efficiency and water consumption. This paper investigate a performance of Desert Cooler using four different pad materials in terms of cooling efficiency ,water consumption and air velocity. Pads of Stainless steel wire mesh, coconut coir, Khus and Wood wool were fabricated and tested using a laboratory-scale experimental arrangement. Maximum water consumption was observed in wood wool pad (0.24 Lit/min). Coconut coir (0.134 Lit/min) and Khus pad (0.21 Lit/min) also shown less water consumption rate as compared to conventional wood wool pad. Minimum water consumption was observed in Stainless steel wire mesh pad (0.066 Lit/min) at same fan speed. Stainless steel wire mesh pad (4.5 m/s) and coconut coir pad (5.2 m/s) shown higher air velocity which provides proper air distribution in room while Wood wool pad (4m/s) and Khus pad (3.4 m/s) were shown lower velocity. Maximum and minimum cooling efficiency were found in wood wool pad and Stainless steel wire mesh pad.

Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use o... more Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use of micro-channel condenser is common in refrigeration and air conditioning industry. Feature of compactness and relatively less weight makes it more suitable for automotive application. Comparison with conventional condenser has shown that performance was high in terms of more COP and improved refrigeration effect. The problem of air mal-distribution effect which was common in air conditioning was reduced with proper modifications. The shape of port of micro-channel condenser had effect on performance of overall system and condenser.

Effect of nanofluid additive and after treatment devices on engine emission - A review

Journal of Physics: Conference Series, 2021

This research paper summaries the research carried by various researcher in the field of Nanofuid... more This research paper summaries the research carried by various researcher in the field of Nanofuids and after treatment devices on performance and emission of CI engines. Basically there are two methods of reducing the emission in the engines. First method is completely burn the fuel i.e. converting hydrocarbon and eliminating the emission. Suppose if the fuel is not completely combustible and it produces emission but it can be reduced by treating it before it enter the atmosphere, this is another way of reducing exhaust emission. The major exhaust emission are NOx and PM i.e. particulate matter. It is evident from many research papers that combustion can be improved by adding Nano additives to reduce the emission. Researcher have used various nano particle of various size and material to improve the performance of the engine and reduce emission. Also they have used various after treatment device reduce emission.

Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use o... more Micro-channel condenser is vital component of vapor compression refrigeration system (VCRS).Use of micro-channel condenser is common in refrigeration and air conditioning industry. Feature of compactness and relatively less weight makes it more suitable for automotive application. Comparison with conventional condenser has shown that performance was high in terms of more COP and improved refrigeration effect. The problem of air mal-distribution effect which was common in air conditioning was reduced with proper modifications. The shape of port of micro-channel condenser had effect on performance of overall system and condenser. Keywords-Micro-channel condenser, vapor compression refrigeration system, COP, Maldistribution.

Experimental investigation of CI engine performance characteristics fuelled with diesel-neem biodiesel blend (D75NB25) with addition of nano iron oxide, silicon dioxide and zinc oxide fuel additive

An overview of use of nanofluid additives in compression ignition engine fuels (diesel and biodiesel)

International Journal of Renewable Energy Research, 2015

Abstract— Recent developments in nanotechnology are useful in many areas of engineering and scien... more Abstract— Recent developments in nanotechnology are useful in many areas of engineering and science. The use of nano fluid additives in compression ignition engines (CI) is one of the emerging areas. Because, fuel consumption and emissions are growing concern in compression ignition engines. The biodiesel fuelled CI engine emits more oxides of nitrogen and smoke. It also consumes more fuel. The objectives of the paper are to critically review the results of recent research papers on nano fluid additives in CI engines. It also reports the comparative analysis of evaporation, performances and emissions characteristic using various nano fluid additives in CI engines. It analyses the effect on properties, method of nano fluid preparation, composition of base fuel (diesel and biodiesel) and suspension stability. It is concluded that various nano particles like metal and metal oxides and carbon based materials can be successfully used in CI engine fuels. It is concluded that nano fluid ad...

Performance evaluation of PV-TEC coupling device for power production with improved hybrid nanocarbon based thermal material interface

Energy Reports, 2021

Abstract The waste heat harnessing from photovoltaic module (PV) with the thermoelectric device (... more Abstract The waste heat harnessing from photovoltaic module (PV) with the thermoelectric device (TE) is considered as an ideal solution for effective thermal management of PV technologies. However, idealized operating conditions for lossless device coupling and reduction in thermal contact resistance need to be investigated further to expedite PV-TE device efficiency. Our simple approach to tandemly attach a low-cost thermoelectric cooling device (TEC) to PV module has improved its power output and electrical efficiency by 1.02% and 1.1% respectively (No. of TEC device-1, 720 W/m2 and 20 °C of water-cooling). Herein, we explored the TEC device for power production as a cost-effective alternative to the traditional thermoelectric (TEG) devices. To facilitates the facile heat transport among the PV-TEC interface, the thermal interface material (TIM) has been applied on TEC devices. The hybridized paste of nanocarbon and thermal grease (NC-TG) was used as a TIM material, morphologically evident the linear alignment between NC in TG matrix has ameliorated the uniform heat conduction. It was observed that the application of hybrid Carbon TIM materials enhances the power generation by 10.65% compared to PV-TG-TEC. The physicochemical analysis and evaluation results indicated that the low-cost synthesized hybrid carbon-based TIM material is efficient in the reduction of thermal contact resistance. Concomitantly, the high heat absorption capacity of nanocarbon accelerated the TEC performance by creating a sufficient temperature gradient across TEC ends. The present work proposed a simple and low-cost pathway for the improvement of TEC performance using hybrid carbon-based TIM material.

SN Applied Sciences, 2021

The performance of heat transfer enhancement (HTE) using modified inserts (MIs) as a vortex gener... more The performance of heat transfer enhancement (HTE) using modified inserts (MIs) as a vortex generator in pipe flow and fluid flow analysis using computational fluid dynamics (CFD) are evaluated in this article. The MIs are fastened to the central rod, and the circular sections of the MIs touched the circular wall of the test pipe. Heat transfer and fluid flow analyses are carried out for the various pitch to diameter ratios (P/D) and angles of the MIs. P/D ratios of 3, 4 and 6 and MIs angles of 15°, 30°, 45°, 60° and 90° are considered for experimental analysis. CFD analysis is carried out for P/D ratios of 3, 4 and 6 and MIs angles of 30°, 45° and 90°. Nusselt number (Nu/Nus) and friction factor (f/fs) ratios are evaluated using the same Reynolds number between 8000 and 17,000 in the experimental study. The MIs encourage the wall and core fluid to be combined thus helps in HTE. It is found that, as the P/D ratio increases, the Nu/Nus and f/fs decrease. If the distance between the M...

New diesel-neem biodiesel blend (D75NB25) containing nano iron oxide, silicon dioxide and zinc oxide for diesel engine: An experimental investigation

Materials Today: Proceedings, 2021

Experimental analysis, modelling of evaporation and ignition characteristics of different biodiesels using RSM

Materials Today: Proceedings, 2021

Abstract In this work, the droplet evaporation rate and ignition probability of biodiesel of neem... more Abstract In this work, the droplet evaporation rate and ignition probability of biodiesel of neem and karanja were investigated and modelled using RSM. The biodiesel from neem and karanja oil were prepared using trasesterification. Thermo-physical properties of fuels was tested. Further, a test rig was fabricated to find out the rate of evaporation of fuel droplet as well as the ignition probability of the biodiesel and comparison was done so as to find out the feasibility for combustion application. It was concluded that the ignition probability and evaporation rate of karanja biodiesel was better than neem biodiesel. Also, evaporation rate and ignition probability above critical surface temperature (450 °C) drastically increased for all fuel. The model of ER and IP was found statistically significant and predict responses accurately at any surface temperature.

Experimental investigation and modeling of the evaporation rate of carbon nanotube blended emulsified Neem biodiesel

Biofuels, 2017

ABSTRACT Neem biodiesel is an abundant fuel in India. However, the higher viscosity and lower cal... more ABSTRACT Neem biodiesel is an abundant fuel in India. However, the higher viscosity and lower calorific value result in a lower evaporation rate, hence limiting its use in combustion applications. The evaporation rate of fuel plays a very important role in combustion reactions. An improvement in evaporation rate can be achieved using nanoparticles in Neem biodiesel. The present investigation was carried out to determine the evaporation characteristics of carbon nanotube suspended Neem biodiesel with different dosing ratios of nanoparticles with and without water. An improvement in evaporation rate with addition of carbon nanotubes was seen in Neem biodiesel. An improvement in calorific value and cetane number was obtained. It can be concluded that an increase in nanoparticle concentration results in an enhancement in evaporation rate. A regression model was developed and found to be statistically significant.

Renewable and Sustainable Energy Reviews, 2016

Mechanics, 2016

A -total heat transfer surface area,m 2 ; Cp -specific heat, J/(kg K); Dc -tube outside diameter,... more A -total heat transfer surface area,m 2 ; Cp -specific heat, J/(kg K); Dc -tube outside diameter, m; Dh -hydraulic diameter, m; f -friction factor; h -heat transfer coefficient, W/(m 2 K); k -thermal conductivity, W/(m 2 K); N -number of tube row; Nu -Nusselt number; mf -mass flow rate, kg/s; ΔP -pressure drop, Pa;

Researchers look for new source of fuel alternating to the petrol and diesel, petrol and diesel a... more Researchers look for new source of fuel alternating to the petrol and diesel, petrol and diesel are very expensive in the world, alternating fuel must be renewable, locally available and environmentally benign. From the alternative source, the significance of biodiesel fuel as technically and commercially viable alternative to petrol and diesel fuel. Depending on the availability of the different stocks biodiesel is made. Due to water emulsified in biodiesel fuel there is increase in ignition probability. This paper contains literature survey which provides reduction in NOx and carbon dioxide using emulsified biodiesel instead of petrol fuel. By adding additives in emulsified biodiesel performance of engine should be increases.

Comparative Analysis of Twin Cylinder C.I. Engine Fueled with Diesel and Preheated Karanj Oil

SAE Technical Paper Series, 2013

American Journal of Scientific and Industrial Research, 2011

Evaporative cooling is a very common form of cooling buildings for thermal comfort since it is re... more Evaporative cooling is a very common form of cooling buildings for thermal comfort since it is relatively cheap and requires less energy than many other forms of cooling. However evaporative cooling requires an abundant water source as an evaporate, and is only efficient when the relative humidity is low, restricting its effective use to dry climates. Traditionally, evaporative cooler pads consist of excelsior (wood wool) inside containment net. Padding media plays a large part in cooling efficiency and water consumption. This paper investigate a performance of Desert Cooler using four different pad materials in terms of cooling efficiency ,water consumption and air velocity. Pads of Stainless steel wire mesh, coconut coir, Khus and Wood wool were fabricated and tested using a laboratory-scale experimental arrangement. Maximum water consumption was observed in wood wool pad (0.24 Lit/min). Coconut coir (0.134 Lit/min) and Khus pad (0.21 Lit/min) also shown less water consumption rate as compared to conventional wood wool pad. Minimum water consumption was observed in Stainless steel wire mesh pad (0.066 Lit/min) at same fan speed. Stainless steel wire mesh pad (4.5 m/s) and coconut coir pad (5.2 m/s) shown higher air velocity which provides proper air distribution in room while Wood wool pad (4m/s) and Khus pad (3.4 m/s) were shown lower velocity. Maximum and minimum cooling efficiency were found in wood wool pad and Stainless steel wire mesh pad.