Results 171 to 180 of about 1,044 (209)
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Investigation of Hot Film Calibration for Entropy Generation Rate Calculations
Volume 1: Fora, Parts A and B, 2002The objective of this paper is to investigate in detail the relationship between results obtained from flow over a circular cylinder in cross flow using Hot Film and Hot Wire Constant Temperature Anemometry (C.T.A.). The experimental results are compared with those obtained using numerical methods. The results obtained from Hot Wire Anemometry are used
R. Mahon, P. Frawley, M. R. D. Davies
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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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Constructal entropy generation rate minimization for X-shaped vascular networks
International Journal of Thermal Sciences, 2015Based on constructal theory, an X-shaped vascular network model in a rectangular area is built in this paper. Subjected to the constraints of the total volume of the tubes and space occupied by the rectangular area, the model is optimized by taking the minimizations of the dimensionless entropy generation rate and dimensionless entropy generation ratio,
Huijun Feng +3 more
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Experimental Determination of Entropy Generation Rate Using Particle Image Velocimetry
ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, 2015As Particle Image Velocimetry (PIV) matures, new techniques have been developed for flow analysis that exploit PIV. One such recent use is in determining the underlying mechanisms of energy losses in fluidic systems. Often times, a First Law of Thermodynamics (FLT) approach is taken to determine the energy losses in a given fluidic system.
James Stewart +4 more
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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, 2011Transient 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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The entropy generation rate minimization for a proposed air ejector for the carpet industry
Meccanica, 2017In this study, a numerical model is developed to simulate an air ejector pump that is proposed for the carpet industry. Simulations have been performed by solving the compressible, steady-state, two-dimensional Reynolds-averaged Navier–Stokes equations, and k–e Realizable model is used to simulate a turbulent flow.
Esmail Lakzian +2 more
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Turbine Blade Entropy Generation Rate: Part II — The Measured Loss
Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration, 2000Using detailed boundary layer velocity measurements the profile loss, expressed in terms of local entropy generation rate, is evaluated at discrete locations along the suction surface of a turbine blade in a subsonic linear cascade at a chord Reynolds number of 1.8 × 103 under adiabatic test conditions.
F. K. O’Donnell, M. R. D. Davies
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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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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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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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