Papers by Sharad Chaudhary
Mechanical stiffening and thermal softening of superionic alkali metal oxides
Nucleation and Atmospheric Aerosols, 2015
The mechanical (pressure) and thermal (temperature) dependent nature of superionic cubic M2O (M =... more The mechanical (pressure) and thermal (temperature) dependent nature of superionic cubic M2O (M = Li, Na, K, and Rb) alkali metal oxides is studied. The model Hamiltonian in ab initio theory include long-range Coulomb, charge transfer, covalency, van der Waals interaction and the short-range repulsive interaction upto second-neighbor ions. The second order elastic constants as functions of pressure discern increasing trend, while to that they decreases with enhanced temperature. From the knowledge of elastic constants, Pugh ratio, Poisson’s ratio, heat capacity and thermal expansion coefficient are calculated. It is noticed that cubic M2O is brittle on applied pressure and temperature and mechanically stiffened as a consequence of bond compression and bond strengthening and thermally softened due to bond expansion and bond weakening due to lattice vibrations.
International Journal of Scientific Research in Science, Engineering and Technology
Vapour compression refrigeration system is the conventional way existing for the refrigeration th... more Vapour compression refrigeration system is the conventional way existing for the refrigeration these days. Although to overcome the loses in conventional method there are several ways to improve the performance of vapour compression refrigeration cycle. This paper provides an alternative method of increasing the performance by varying the area ratio of the ejector. As Ejector is the most simple and economical replacement of throttling valve. A Simulation model is developed and parametric study of ejector is done. It was found that there will be increase in performance as area ratio is changed. This cycle is named as Ejector expansion Refrigeration System.
International Journal of Low-Carbon Technologies, 2009
The efficient power, defined as the product of power output and efficiency, of an engine is taken... more The efficient power, defined as the product of power output and efficiency, of an engine is taken as the objective for performance analysis and optimization of an internally and externally irreversible radiative Carnot heat engine model in the viewpoint of finite time thermodynamics or entropy generation minimization. Results obtained are compared with those obtained by using maximum power (MP) and MP density (MPD) criteria, and the advantages and disadvantages of a maximum efficient power (MEP) design are analysed. The result showed that the engine design at MEP conditions has an advantage of smaller size and is more efficient than those designed at MP and MPD conditions.
International Journal of Low-Carbon Technologies, 2009
The efficient power, defined as the product of power output and efficiency of the engine, is take... more The efficient power, defined as the product of power output and efficiency of the engine, is taken as the objective for performance analysis and optimization of an endoreversible combined Carnot heat engine model in the viewpoint of finite time thermodynamics (FTT) or entropy generation minimization (EGM). The effects of finite-rate heat transfer, cycle temperature ratio and thermal-conduction parameters are considered in the analysis. The obtained results are compared with those obtained using maximum power (MP) and maximum power density (MPD) criterion. The design parameters for the optimal performances were derived analytically, and the effects of cycle temperature ratio and thermal conductance on it are investigated. The engines designed at MEP approach are more efficient and smaller than those designed at MP and MPD conditions.
Temperature and pressure dependent thermodynamical properties of uranium dinitrides: UN[sub 2]
AIP Conference Proceedings, 2013
ABSTRACT The high temperature and high pressure thermodynamic properties of UN2 are evaluated by ... more ABSTRACT The high temperature and high pressure thermodynamic properties of UN2 are evaluated by developing an effective interionic interaction potential with long range Coulomb, charge transfer, covalency, van der Waals interaction and the short-range repulsive interaction upto second-neighbor ions within the Hafemeister and Flygare approach. The second order elastic constants are used to estimate the Debye temperature which in turn computes the heat capacity and elastic wave velocities propagating in the UN2. Deduced results on pressure (temperature) dependence of thermodynamical properties are consistent with the available experimental data and theoretical results.
Optimum criteria on the performance of a generalised irreversible Carnot heat engine based on a thermoeconomic approach
International Journal of Ambient Energy, 2007
... be addressed) E-mail: govind~maheshwari2001 @yahoo.com ** Sharad Chaudhary, Department of Mec... more ... be addressed) E-mail: govind~maheshwari2001 @yahoo.com ** Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engineering and Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. "* Sunil K. Somani, Department of Mechanical ...
An ecological optimisation of an irreversible radiative type heat engine
International Journal of Ambient Energy, 2007
... "* Ashutosh Mehta, Department of Mechanical Engineering, lnstitute of Engineering &a... more ... "* Ashutosh Mehta, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. t Sunil K. Somani, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya ...
Mechanical stiffening and thermal softening of superionic alkali metal oxides
Nucleation and Atmospheric Aerosols, 2015
The mechanical (pressure) and thermal (temperature) dependent nature of superionic cubic M2O (M =... more The mechanical (pressure) and thermal (temperature) dependent nature of superionic cubic M2O (M = Li, Na, K, and Rb) alkali metal oxides is studied. The model Hamiltonian in ab initio theory include long-range Coulomb, charge transfer, covalency, van der Waals interaction and the short-range repulsive interaction upto second-neighbor ions. The second order elastic constants as functions of pressure discern increasing trend, while to that they decreases with enhanced temperature. From the knowledge of elastic constants, Pugh ratio, Poisson’s ratio, heat capacity and thermal expansion coefficient are calculated. It is noticed that cubic M2O is brittle on applied pressure and temperature and mechanically stiffened as a consequence of bond compression and bond strengthening and thermally softened due to bond expansion and bond weakening due to lattice vibrations.
International Journal of Scientific Research in Science, Engineering and Technology
Vapour compression refrigeration system is the conventional way existing for the refrigeration th... more Vapour compression refrigeration system is the conventional way existing for the refrigeration these days. Although to overcome the loses in conventional method there are several ways to improve the performance of vapour compression refrigeration cycle. This paper provides an alternative method of increasing the performance by varying the area ratio of the ejector. As Ejector is the most simple and economical replacement of throttling valve. A Simulation model is developed and parametric study of ejector is done. It was found that there will be increase in performance as area ratio is changed. This cycle is named as Ejector expansion Refrigeration System.
International Journal of Low-Carbon Technologies, 2009
The efficient power, defined as the product of power output and efficiency, of an engine is taken... more The efficient power, defined as the product of power output and efficiency, of an engine is taken as the objective for performance analysis and optimization of an internally and externally irreversible radiative Carnot heat engine model in the viewpoint of finite time thermodynamics or entropy generation minimization. Results obtained are compared with those obtained by using maximum power (MP) and MP density (MPD) criteria, and the advantages and disadvantages of a maximum efficient power (MEP) design are analysed. The result showed that the engine design at MEP conditions has an advantage of smaller size and is more efficient than those designed at MP and MPD conditions.
International Journal of Low-Carbon Technologies, 2009
The efficient power, defined as the product of power output and efficiency of the engine, is take... more The efficient power, defined as the product of power output and efficiency of the engine, is taken as the objective for performance analysis and optimization of an endoreversible combined Carnot heat engine model in the viewpoint of finite time thermodynamics (FTT) or entropy generation minimization (EGM). The effects of finite-rate heat transfer, cycle temperature ratio and thermal-conduction parameters are considered in the analysis. The obtained results are compared with those obtained using maximum power (MP) and maximum power density (MPD) criterion. The design parameters for the optimal performances were derived analytically, and the effects of cycle temperature ratio and thermal conductance on it are investigated. The engines designed at MEP approach are more efficient and smaller than those designed at MP and MPD conditions.
AIP Conference Proceedings, 2013
ABSTRACT The high temperature and high pressure thermodynamic properties of UN2 are evaluated by ... more ABSTRACT The high temperature and high pressure thermodynamic properties of UN2 are evaluated by developing an effective interionic interaction potential with long range Coulomb, charge transfer, covalency, van der Waals interaction and the short-range repulsive interaction upto second-neighbor ions within the Hafemeister and Flygare approach. The second order elastic constants are used to estimate the Debye temperature which in turn computes the heat capacity and elastic wave velocities propagating in the UN2. Deduced results on pressure (temperature) dependence of thermodynamical properties are consistent with the available experimental data and theoretical results.
Optimum criteria on the performance of a generalised irreversible Carnot heat engine based on a thermoeconomic approach
International Journal of Ambient Energy, 2007
... be addressed) E-mail: govind~maheshwari2001 @yahoo.com ** Sharad Chaudhary, Department of Mec... more ... be addressed) E-mail: govind~maheshwari2001 @yahoo.com ** Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engineering and Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. "* Sunil K. Somani, Department of Mechanical ...
International Journal of Ambient Energy, 2007
... "* Ashutosh Mehta, Department of Mechanical Engineering, lnstitute of Engineering &a... more ... "* Ashutosh Mehta, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. t Sunil K. Somani, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya ...
International Journal of Ambient Energy, 2006
... India. "' Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engi... more ... India. "' Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. t Sunil k Sornani, Department of Mechanical Engineering. ...
Performance comparison of an irreversible closed variable temperature heat reservoir Carnot engine under maximum power density and maximum power conditions
International Journal of Ambient Energy, 2006
... India. "' Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engi... more ... India. "' Sharad Chaudhary, Department of Mechanical Engineering, lnstitute of Engineering & Technology, Devi Ahilya University, Khandwa Road, lndore-452017, India. t Sunil k Sornani, Department of Mechanical Engineering. ...
The principal of refrigeration is method of successful storage of vegetable and fruits to maintai... more The principal of refrigeration is method of successful storage of vegetable and fruits to maintain their flavour and freshness, for post harvest product deterioration start with time and temperature so it need to be maintain desirable temperature and relative humidity for post harvest product that is for potato. A cold storage design at village HARSODAN district Ujjain (m.p.) to give better facility for potato storage. This paper deal with all standard refrigeration principles and different aspect of design of cold storage and this design is hypothetically intended to serve as a guide for future fabrication and erection. .
Ijesrt International Journal of Engineering Sciences & Research Technology Thermal System Design of a Cold Storage for 1500 Metric Tonne Potatos
Mechanical properties of large band width semiconductors like Alkaline-earth-chalcogenides compou... more Mechanical properties of large band width semiconductors like Alkaline-earth-chalcogenides compound are important for high temperature applications. The pressure dependent ductile (brittle) nature of such a compound is computed by formulating an effective inter-ionic interaction potential consisting the long-range Coulomb, the Hafemeister and Flygare type short-range overlap repulsion extended up to the second neighbor ions and the van der Waals (vdW) interaction. From the elastic constants the Poisson's ration, ratio RG/B of G (shear modulus) over B (bulk modulus) is calculated. It is noticed that alkaline-earth-chalcogenides [AECs] (AX; A = Ca, Sr; X =S, Se, Te) are brittle at low pressures and ductile at high pressures in B1 phase and remain ductile at all pressures in B2 phase.
It is established that the Ejector Expansion Refrigeration system achieves the significant improv... more It is established that the Ejector Expansion Refrigeration system achieves the significant improvement in coefficient of performance as compared to other system. Use of an ejector as expansion device is one of the alternative ways. The performance of a vapour compression system that uses an ejector as an expansion device is investigated. Ejector Expansion Refrigeration systems are analysed in this article using constant pressure and constant area mixing ejector as an expansion device. This paper provides a comparison between constant pressure and constant area model using R-1270 as a refrigerant. In the analysis, a two-phase constant area and constant pressure ejector flow model was used. Pressure variation along the length of the ejector is obtained for constant area model. The pressure variation is found to be higher for constant area ejector model compared to constant pressure model.
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Papers by Sharad Chaudhary