Results 251 to 260 of about 50,610 (294)
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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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Comparison of Entropy Generation Rate Calculation Methods for Engineering Applications
43rd AIAA Thermophysics Conference, 2012Physics-based modeling and simulation requires proper formulation of the fundamental equations for numerical solution in order to best-represent the physical system being modeled. A standard engineering method to calculate the entropy generation rate is to assume steady flow and then use the steady entropy balance equation.
John Doty, Jose Camberos, Kirk Yerkes
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Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 2022
A detailed numerical analysis is carried out in a real human thoracic aorta by means of the Computational Fluid Dynamics (CFD) for the prediction of the atherosclerosis lesion. Common hemodynamics parameters, such as, the oscillatory shear index (OSI) and the time average wall shear stress (TAWSS) are used for the prediction of the atherosclerosis ...
Jesús A Crespo-Quintanilla +4 more
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A detailed numerical analysis is carried out in a real human thoracic aorta by means of the Computational Fluid Dynamics (CFD) for the prediction of the atherosclerosis lesion. Common hemodynamics parameters, such as, the oscillatory shear index (OSI) and the time average wall shear stress (TAWSS) are used for the prediction of the atherosclerosis ...
Jesús A Crespo-Quintanilla +4 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 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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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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DNS Of entropy generation rates for turbulent flows subjected to high temperature gradients
International Journal of Heat and Mass Transfer, 2021Abstract Direct Numerical Simulations are performed to analyze the influence of key boundary conditions and flow characteristics on entropy generation rate statistics in a highly anisothermal forced convective turbulent channel flow of a thermo-dependent fluid submitted to asymmetrical heating.
J.M. Avellaneda +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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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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