Results 261 to 270 of about 50,610 (294)

Metastable Equilibrium of a Dynamic Electrical System in Terms of Entropy Generation Rate

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011
Transient dynamic DC electrical systems are often characterized by response time, amount of damping, and dynamic behavior of outputs in terms of input functions. This investigation correlates some of these standard responses in terms of nonequilibrium entropy generation rates to illustrate the concept of thermodynamic equivalence of metastable DC ...
John Doty, Kirk Yerkes
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Investigation of entropy generation rate and its minimization in helical grooved tubes

Journal of Mechanical Science and Technology, 2018
Surface enhancement in heat exchangers has been actively researched, but enhancements have been mainly on the tube side, involving optimization of the geometry. The effect of surface enhancement has been studied in great detail experimentally, but numerical studies are scarce and involve performance comparisons based on the friction factor and Nusselt ...
Shamoon Jamshed, Shafiq R. Qureshi, Aqeel Shah, Ahmad Hussain   +3 more
openaire   +1 more source

Constructal entropy generation rate minimization for cylindrical pin-fin heat sinks

International Journal of Thermal Sciences, 2017
Abstract Optimization of in-line cylindrical pin-fin heat sinks (PFHS) is carried out by using constructal theory and entropy generation minimization (EGM) theory for fixed total heat sink volume and fin-material volume. The optimal constructs of cylindrical pin-fin are obtained by taking the minimum entropy generation rate (MEGR) as objective, and ...
Lingen Chen, Aibo Yang, Zhihui Xie, Fengrui Sun   +3 more
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Calculation of Entropy Generation Rates via DSMC with Application to Continuum/Equilibrium Onset

38th AIAA Thermophysics Conference, 2005
This paper expands upon the concept of entropy generation as a means of examining the breakdown of the continuum fluid equations in regions of nonequilibrium. A brief analysis based on statistical mechanics and kinetic theory is presented which leads to expressions for the entropy contribution of the translational energy mode, as well as the rotational
Christopher Schrock, Richard McMullan, Jose Camberos   +2 more
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Effects of couple stresses on entropy generation rate in a porous channel with convective heating

Computational and Applied Mathematics, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Adesanya, Samuel O., Makinde, Oluwole D.
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Entropy generation rate optimisation for profiled endwall design for axial turbines

Proceedings of Global Power & Propulsion Society
This paper investigates the formulation of the optimal objective function for aerodynamic design of turbomachinery using genetic algorithms (GA) supported by Computational Fluid Dynamics (CFD). The aim is to outline entropy generation rate minimisation as the most suitable objective function for improving turbomachinery. To this end, the calculation of
Pedro A. Martinez-Castro, Richard J. Williams, Grant L. Ingram   +2 more
openaire   +1 more source

Effects of design parameters on entropy generation rate of sulphuric acid decomposition process

International Journal of Ambient Energy, 2019
Based on the finite-time thermodynamics, the sulphuric acid (H2SO4) decomposition process (SADP) is investigated in this paper.
Chao Wang, Shaojun Xia, Lingen Chen, Yanlin Ge, Lei Zhang, Huijun Feng   +5 more
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Analysis of entropy generation rate inside the stack of standing-wave thermoacoustic refrigerator

AIP Conference Proceedings, 2012
Considering from the second law of thermodynamics, the equation for entropy generation rate near a single-plate, representative of the stack inside thermoacoustic refrigerators was derived in this paper. It indicates that entropy generation is produced due to heat transfer in the x-y direction of finite temperature gradients and fluid friction ...
Xiujuan Xie, Gang Gao, Qing Li
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Some Remarks About the Computation of the Entropy Generation Rate in Turbomachinery

2009
accepted for publication ...
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Entropy generation rate for a mechatronics system

International Journal of Exergy, 2017
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