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Constructal entropy generation rate minimization for cylindrical pin-fin heat sinks
International Journal of Thermal Sciences, 2017Abstract 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 +3 more
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Entropy Generation Rate for Performance of Heat Transfer in Heat Exchangers
2022This chapter provides a specific study of the performance of thermal systems, principally heat exchangers, which are applied in several industrial applications such as chemical industry, energetic industry, industrial lasers, and so on. These thermodynamics systems were critical in transferring heat from a higher to a lower temperature fluid. They have
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Investigation of entropy generation rate and its minimization in helical grooved tubes
Journal of Mechanical Science and Technology, 2018Surface 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 +3 more
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On the Assessment of Mechanical Degradation of Grease Using Entropy Generation Rate
Tribology Letters, 2019A methodology for continuous monitoring of grease degradation subjected to mechanical shearing is proposed. It is hypothesized that the mechanical degradation of grease is akin to the running-in process in a tribo-pair with both transient and steady-state regimes.
K. P. Lijesh, M. M. Khonsari
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Optimization of plate-fin heat exchangers by minimizing specific entropy generation rate
International Journal of Heat and Mass Transfer, 2014In the present study, an optimization model is developed for plate-fin heat exchangers (PFHEs) based on the entropy generation minimization method. In the modeling, the entropy generation rate per unit partition plate area, i.e., specific entropy generation rate is proposed as an optimization objective function and the total heat transfer area of a ...
Yuanyuan Zhou +3 more
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International Journal of Heat and Mass Transfer, 2019
Abstract The process of hydrocarbon synthesis from carbon dioxide and hydrogen in a fixed-bed reactor, a novel approach of converting renewable and distributed energy to high-energy-density liquid hydrocarbon fuels, is designed and optimized thermodynamically in the present study.
Lei Zhang +5 more
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Abstract The process of hydrocarbon synthesis from carbon dioxide and hydrogen in a fixed-bed reactor, a novel approach of converting renewable and distributed energy to high-energy-density liquid hydrocarbon fuels, is designed and optimized thermodynamically in the present study.
Lei Zhang +5 more
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Effects of design parameters on entropy generation rate of sulphuric acid decomposition process
International Journal of Ambient Energy, 2019Based on the finite-time thermodynamics, the sulphuric acid (H2SO4) decomposition process (SADP) is investigated in this paper.
Chao Wang +5 more
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Entropy generation rate optimisation for profiled endwall design for axial turbines
Proceedings of Global Power & Propulsion SocietyThis 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 +2 more
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50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012
A new formulation is presented for calculation of unsteady entropy generation rate for thermophysical systems. This formulation has far-reaching implications for analysis and design of all systems. It has long been considered that direct calculation of entropy generation rate was impossible due to the insufficiency of independent information for ...
John Doty, Jose Camberos, Kirk Yerkes
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A new formulation is presented for calculation of unsteady entropy generation rate for thermophysical systems. This formulation has far-reaching implications for analysis and design of all systems. It has long been considered that direct calculation of entropy generation rate was impossible due to the insufficiency of independent information for ...
John Doty, Jose Camberos, Kirk Yerkes
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Calculation of Entropy Generation Rates via DSMC with Application to Continuum/Equilibrium Onset
38th AIAA Thermophysics Conference, 2005This 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 +2 more
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