Dr. Manoj Kumar Praharaj | Biju Patnaik University and Technology, Rourkela, Odisha, INDIA (original) (raw)
Papers by Dr. Manoj Kumar Praharaj
Abstract: Ultrasonic velocity, density and viscosity measurements have been determined for differ... more Abstract: Ultrasonic velocity, density and viscosity measurements have been determined for different ratios of aqueous sodium chloride and potassium chloride solution at and about normal body temperature. The ratio required for the homeostatic balance in the human body is analysed in terms of the thermodynamic parameters derived from the ultrasonic data.
The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl a... more The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl at different concentrations, at different frequencies at constant temperature (293 0 K). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility, free length, free volume, internal pressure, relaxation time, acoustic impedance, Gibb's free energy and absorption coefficient for the solution. This kind of study is important for both humans as well as plants.
Nanofluids are colloidal suspensions obtained by dispersing nanoparticles in any base fluid. Thes... more Nanofluids are colloidal suspensions obtained by dispersing nanoparticles in any base fluid. These new type of fluids have attracted wide interest in recent years as nanofluids have significantly higher thermal conductivity than the base fluids. In this work nanofluids containing copper nanoparticles have been developed using a novel chemical method in our laboratory. Nanofluids soprepared were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The measurements of ultrasonic velocity and ultrasonic attenuation in the prepared samples were made as function of temperature and concentration of the copper nanoparticles in the PVA. The obtained results were analyzed taking into account the ultrasonic and thermal behavior of matrix and particles. The thermal conductivity of synthesized nanofluids was measured with Hot Disk Thermal Constant Analyser and 20-35% enhancement was found in the thermal conductivity of Cu-PVA nanofluids h...
International Journal of Current Research and Academic Review, 2017
The electrical conductivity (σ), ultrasonic velocity (U), density (ρ) and viscosity (η) have been... more The electrical conductivity (σ), ultrasonic velocity (U), density (ρ) and viscosity (η) have been measured for the aqueous potassium chloride solutions at different temperatures and at frequency 4 MHz for different concentration of KCl. The experimental data's have been used for study of the molecular interaction in the different solutions using different parameters such as adiabatic compressibility, free length, acoustic impedance and relaxation time. Variation in the above parameters for the different solutions at different temperature is indicative of the nature of interaction between them.
The Ultrasonic velocity, density and viscosity have been measured for different ratios of sodium ... more The Ultrasonic velocity, density and viscosity have been measured for different ratios of sodium (Na) to potassium (K) about vitality ratio and about normal body temperature. The ratios are analysed in terms of the thermodynamic parameters derived from the ultrasonic data.
The density, viscosity and ultrasonic velocity of ternary liquid mixtures of N,N-dimethylformamid... more The density, viscosity and ultrasonic velocity of ternary liquid mixtures of N,N-dimethylformamide, cyclohexane and benzene have been measured at different frequencies (2MHz, 4MHz,6MHz and 8MHz) using a multi frequency ultrasonic interferometer over the entire range of mole fraction at temperature 318 K. The data have been utilized to compute the acoustical parameters such as adiabatic compressibility (β), free length (L f), free volume (V f), internal pressure (П i), relaxation time (τ), acoustic impedance (Z), and Gibb's free energy (∆G) and their excess values, using the standard relations. The variations of sound speed with frequency plays a key role in analyzing the intermolecular interactions present in the ternary mixture. The results have been interpreted in terms of molecular interactions existing between the components of the mixtures.
The ultrasonic velocity, density, and viscosity have been measured for ternary mixtures of nitrob... more The ultrasonic velocity, density, and viscosity have been measured for ternary mixtures of nitrobenzene, N,N-dimethylformamide, and cyclohexane at temperatureT = 318 K at different frequencies such as 2, 4, 6, and 8 MHz. The experimental data have been used to calculate the acoustical and thermodynamical parameters like adiabatic compressibility, free length, free volume, internal pressure, acoustic impedance, Gibbs free energy, and their excess values. In particular, it is seen that the response of these parameters to frequency is less prominent incomparison to that of the ternary mixtures containing N,N-dimethylformamide, cyclohexane, and chlorobenzene.
Ultrasonic velocity in ternary mixture containing Benzene group of liquids has been evaluated as ... more Ultrasonic velocity in ternary mixture containing Benzene group of liquids has been evaluated as function of concentration and temperature, by using certain theoretical models like Nomoto’s relation, Impedance dependence relation, Ideal mixture relation, Rao’s specific velocity relation and Jungie’s method. The experimental values of ultrasonic velocity are compared with the theoretical values. Molecular interaction parameter and the percentage deviation thus calculated indicate the non-ideality in the mixtures.
Journal of Chemical, Biological and Physical Sciences
The ultrasonic velocity, density and viscosity have been measured for the ternary mixture of benz... more The ultrasonic velocity, density and viscosity have been measured for the ternary mixture of benzene, chloro-benzene, nitro-benzene and pyridine with N, N-dimethylformamide (DMF) in cyclohexane at different temperature, frequencies and concentration. The experimental data have been used for a comparative study of the molecular interaction in the different mixtures using the parameters, molar volume, available volume, free volume, surface tension, Rao's constant, Wada's constant, Vander wall's constant and excess values of some parameter's such as excess density, excess viscosity, excess velocity, excess free volume, excess Gibb's free energy and excess surface tension.
Journal of Scientific Research
Ultrasonic velocity measurements, density measurements, and viscometric studies were conducted fo... more Ultrasonic velocity measurements, density measurements, and viscometric studies were conducted for the ternary mixture of pyridine and toluene separately with N, N-dimethylformamide (DMF) in butanol, at different temperatures and for different concentrations of component liquids. Using these basic experimental data, various acoustic and thermodynamic parameters, such as adiabatic compressibility (β), free length (Lf,), free volume (Vf), etc. were calculated. Also, Excess thermo-acoustical parameters were calculated from the experimentally measured data. The outcomes were expressed in terms of the molecular interactions and the variations in parameters under varying solute concentrations. A comparative study is discussed. Variation in the above parameters for the different mixtures is indicative of the nature of the interactions between the components in the liquid mixture. Concluding remarks regarding intermolecular interactions are provided.
Indian Journal of Natural Sciences, Vol.14 / Issue 77 /April / 2023, 2023
In the past, many researchers have researched the utilization of fly ash in concrete as the repla... more In the past, many researchers have researched the utilization of fly ash in concrete as the replacement of
cement. It is focused on partial replacement of cement with appropriate amounts of fly ash, but
utilization of fly ash aggregates in concrete as the replacement of natural aggregates helped in large
volume in construction. In the present scenario, the researcher mostly interested to do the research in fly
ash in wide range because the utilization of large amount of fly ash reduces the environmental pollution
and abate of natural resources. Natural aggregates used in concrete as an inert filler give strength and
provide bulk volume to the concrete. Natural crushed aggregates that used in concrete are mainly
produced from exhausting the natural resources so that it requires substitute building materials. So it
leds wide research on using the waste product as the preparation of aggregate. So fly ash use to prepare
the aggregate which mix with cement in the ratio of 1:5 having the water cement ratio 0.3 to 0.5 in a
standard atmospheric condition. In this paper it is mainly concentrated on fly ash aggregate that is light
in weight and followed by 28 days of curing. The shape of these aggregates are round and
approximately 10-20mm size. The tests have been conducted for the characteristic of the fly ash
aggregates and the result suggested that these fly ash aggregates can be used as the replacement of
natural coarse aggregate in concrete. The by-products like fly ash, bottomash, silica fumes, blast furnace
slag that used to prepare the artificial lightweight aggregates. Fly ash are the byproducts of nearby power
plants like NTPC, Talcher & IMFA power plant, Choudwar easily available with minimum cost. In the
recent time, due to the cost effectiveness, the construction material are widely used in concrete for mass
application.
The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl a... more The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl at different concentrations, at different temperatures and at constant frequency (9 MHz). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility, free length, internal pressure, relaxation time, acoustic impedance, and Gibb's free energy for the solution. This kind of study is important for both humans as well as plants.
Journal of Chemical and Pharmaceutical Research, 2012
The Ultrasonic velocity, density and viscosity have been measured for ternary mixture of N-N dime... more The Ultrasonic velocity, density and viscosity have been measured for ternary mixture of N-N dimethylformamide (DMF), Cyclohexane and Chloro-benzene at different frequencies (2 MHz, 4 MHz, 6 MHz and 8 MHz) for a constant temperature (318 K). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility (β), free length (L f), internal pressure (Πi), relaxation time (τ), acoustic impedance (Z), Gibb's free energy (∆G) and absorption coefficient for the mixture. The excess values of the parameters are also evaluated and discussed.
Abstract: Ultrasonic velocity, density and viscosity measurements have been determined for differ... more Abstract: Ultrasonic velocity, density and viscosity measurements have been determined for different ratios of aqueous sodium chloride and potassium chloride solution at and about normal body temperature. The ratio required for the homeostatic balance in the human body is analysed in terms of the thermodynamic parameters derived from the ultrasonic data.
The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl a... more The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl at different concentrations, at different frequencies at constant temperature (293 0 K). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility, free length, free volume, internal pressure, relaxation time, acoustic impedance, Gibb's free energy and absorption coefficient for the solution. This kind of study is important for both humans as well as plants.
Nanofluids are colloidal suspensions obtained by dispersing nanoparticles in any base fluid. Thes... more Nanofluids are colloidal suspensions obtained by dispersing nanoparticles in any base fluid. These new type of fluids have attracted wide interest in recent years as nanofluids have significantly higher thermal conductivity than the base fluids. In this work nanofluids containing copper nanoparticles have been developed using a novel chemical method in our laboratory. Nanofluids soprepared were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The measurements of ultrasonic velocity and ultrasonic attenuation in the prepared samples were made as function of temperature and concentration of the copper nanoparticles in the PVA. The obtained results were analyzed taking into account the ultrasonic and thermal behavior of matrix and particles. The thermal conductivity of synthesized nanofluids was measured with Hot Disk Thermal Constant Analyser and 20-35% enhancement was found in the thermal conductivity of Cu-PVA nanofluids h...
International Journal of Current Research and Academic Review, 2017
The electrical conductivity (σ), ultrasonic velocity (U), density (ρ) and viscosity (η) have been... more The electrical conductivity (σ), ultrasonic velocity (U), density (ρ) and viscosity (η) have been measured for the aqueous potassium chloride solutions at different temperatures and at frequency 4 MHz for different concentration of KCl. The experimental data's have been used for study of the molecular interaction in the different solutions using different parameters such as adiabatic compressibility, free length, acoustic impedance and relaxation time. Variation in the above parameters for the different solutions at different temperature is indicative of the nature of interaction between them.
The Ultrasonic velocity, density and viscosity have been measured for different ratios of sodium ... more The Ultrasonic velocity, density and viscosity have been measured for different ratios of sodium (Na) to potassium (K) about vitality ratio and about normal body temperature. The ratios are analysed in terms of the thermodynamic parameters derived from the ultrasonic data.
The density, viscosity and ultrasonic velocity of ternary liquid mixtures of N,N-dimethylformamid... more The density, viscosity and ultrasonic velocity of ternary liquid mixtures of N,N-dimethylformamide, cyclohexane and benzene have been measured at different frequencies (2MHz, 4MHz,6MHz and 8MHz) using a multi frequency ultrasonic interferometer over the entire range of mole fraction at temperature 318 K. The data have been utilized to compute the acoustical parameters such as adiabatic compressibility (β), free length (L f), free volume (V f), internal pressure (П i), relaxation time (τ), acoustic impedance (Z), and Gibb's free energy (∆G) and their excess values, using the standard relations. The variations of sound speed with frequency plays a key role in analyzing the intermolecular interactions present in the ternary mixture. The results have been interpreted in terms of molecular interactions existing between the components of the mixtures.
The ultrasonic velocity, density, and viscosity have been measured for ternary mixtures of nitrob... more The ultrasonic velocity, density, and viscosity have been measured for ternary mixtures of nitrobenzene, N,N-dimethylformamide, and cyclohexane at temperatureT = 318 K at different frequencies such as 2, 4, 6, and 8 MHz. The experimental data have been used to calculate the acoustical and thermodynamical parameters like adiabatic compressibility, free length, free volume, internal pressure, acoustic impedance, Gibbs free energy, and their excess values. In particular, it is seen that the response of these parameters to frequency is less prominent incomparison to that of the ternary mixtures containing N,N-dimethylformamide, cyclohexane, and chlorobenzene.
Ultrasonic velocity in ternary mixture containing Benzene group of liquids has been evaluated as ... more Ultrasonic velocity in ternary mixture containing Benzene group of liquids has been evaluated as function of concentration and temperature, by using certain theoretical models like Nomoto’s relation, Impedance dependence relation, Ideal mixture relation, Rao’s specific velocity relation and Jungie’s method. The experimental values of ultrasonic velocity are compared with the theoretical values. Molecular interaction parameter and the percentage deviation thus calculated indicate the non-ideality in the mixtures.
Journal of Chemical, Biological and Physical Sciences
The ultrasonic velocity, density and viscosity have been measured for the ternary mixture of benz... more The ultrasonic velocity, density and viscosity have been measured for the ternary mixture of benzene, chloro-benzene, nitro-benzene and pyridine with N, N-dimethylformamide (DMF) in cyclohexane at different temperature, frequencies and concentration. The experimental data have been used for a comparative study of the molecular interaction in the different mixtures using the parameters, molar volume, available volume, free volume, surface tension, Rao's constant, Wada's constant, Vander wall's constant and excess values of some parameter's such as excess density, excess viscosity, excess velocity, excess free volume, excess Gibb's free energy and excess surface tension.
Journal of Scientific Research
Ultrasonic velocity measurements, density measurements, and viscometric studies were conducted fo... more Ultrasonic velocity measurements, density measurements, and viscometric studies were conducted for the ternary mixture of pyridine and toluene separately with N, N-dimethylformamide (DMF) in butanol, at different temperatures and for different concentrations of component liquids. Using these basic experimental data, various acoustic and thermodynamic parameters, such as adiabatic compressibility (β), free length (Lf,), free volume (Vf), etc. were calculated. Also, Excess thermo-acoustical parameters were calculated from the experimentally measured data. The outcomes were expressed in terms of the molecular interactions and the variations in parameters under varying solute concentrations. A comparative study is discussed. Variation in the above parameters for the different mixtures is indicative of the nature of the interactions between the components in the liquid mixture. Concluding remarks regarding intermolecular interactions are provided.
Indian Journal of Natural Sciences, Vol.14 / Issue 77 /April / 2023, 2023
In the past, many researchers have researched the utilization of fly ash in concrete as the repla... more In the past, many researchers have researched the utilization of fly ash in concrete as the replacement of
cement. It is focused on partial replacement of cement with appropriate amounts of fly ash, but
utilization of fly ash aggregates in concrete as the replacement of natural aggregates helped in large
volume in construction. In the present scenario, the researcher mostly interested to do the research in fly
ash in wide range because the utilization of large amount of fly ash reduces the environmental pollution
and abate of natural resources. Natural aggregates used in concrete as an inert filler give strength and
provide bulk volume to the concrete. Natural crushed aggregates that used in concrete are mainly
produced from exhausting the natural resources so that it requires substitute building materials. So it
leds wide research on using the waste product as the preparation of aggregate. So fly ash use to prepare
the aggregate which mix with cement in the ratio of 1:5 having the water cement ratio 0.3 to 0.5 in a
standard atmospheric condition. In this paper it is mainly concentrated on fly ash aggregate that is light
in weight and followed by 28 days of curing. The shape of these aggregates are round and
approximately 10-20mm size. The tests have been conducted for the characteristic of the fly ash
aggregates and the result suggested that these fly ash aggregates can be used as the replacement of
natural coarse aggregate in concrete. The by-products like fly ash, bottomash, silica fumes, blast furnace
slag that used to prepare the artificial lightweight aggregates. Fly ash are the byproducts of nearby power
plants like NTPC, Talcher & IMFA power plant, Choudwar easily available with minimum cost. In the
recent time, due to the cost effectiveness, the construction material are widely used in concrete for mass
application.
The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl a... more The Ultrasonic velocity, density, and viscosity have been measured for aqueous solution of NaCl at different concentrations, at different temperatures and at constant frequency (9 MHz). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility, free length, internal pressure, relaxation time, acoustic impedance, and Gibb's free energy for the solution. This kind of study is important for both humans as well as plants.
Journal of Chemical and Pharmaceutical Research, 2012
The Ultrasonic velocity, density and viscosity have been measured for ternary mixture of N-N dime... more The Ultrasonic velocity, density and viscosity have been measured for ternary mixture of N-N dimethylformamide (DMF), Cyclohexane and Chloro-benzene at different frequencies (2 MHz, 4 MHz, 6 MHz and 8 MHz) for a constant temperature (318 K). These experimental data have been used to estimate the thermodynamic parameters such as adiabatic compressibility (β), free length (L f), internal pressure (Πi), relaxation time (τ), acoustic impedance (Z), Gibb's free energy (∆G) and absorption coefficient for the mixture. The excess values of the parameters are also evaluated and discussed.