Results 251 to 260 of about 268,561 (292)
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Entropy generation in silicon thin film: Influence of film thickness on entropy generation rate
Journal of Non-Equilibrium Thermodynamics, 2014Abstract Thermodynamic irreversibility in thin silicon film is considered and entropy generation in the film is predicted. The Boltzmann equation is incorporated to formulate the phonon transport in the film due to temperature disturbance across the film edges. Frequency-dependent and frequency-independent phonon transport are introduced
Haider Ali, Bekir S. Yilbas
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Determination of LEDs degradation with entropy generation rate
Journal of Applied Physics, 2017We propose a method to assess the degradation and aging of light emitting diodes (LEDs) based on irreversible entropy generation rate. We degraded several LEDs and monitored their entropy generation rate (Ṡ) in accelerated tests. We compared the thermoelectrical results with the optical light emission evolution during degradation.
Angel Cuadras +2 more
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Robust heart rate variability analysis by generalized entropy minimization
Computational Statistics & Data Analysis, 2015zbMATH Open Web Interface contents unavailable due to conflicting licenses.
La Vecchia, Davide +2 more
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Flow-Induced Endothelial Surface Reorganization and Minimization of Entropy Generation Rate
Journal of Biomechanical Engineering, 2004Effects of hydrodynamic shear on the shape of the endothelial surface are examined based on evaluations of the rate of entropy generation at the cell surface. A linear solution of the flow over a sinusoidally varying endothelial surface is used to evaluate the entropy generation rate on the cell surface for which measured cell dimensions are available.
Haidong, Liu, Uichiro, Narusawa
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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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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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The Measurement and Prediction of Boundary Layer Entropy Generation Rate
Fluids Engineering, 2003In this paper hot wire measurements of the boundary layer velocity profiles at discrete locations along the suction surface of a turbine blade profile are presented. The measured aerodynamic data is transformed into thermodynamic data by way of the entropy function for the investigated Reynolds numbers of 76,000, 120,000 and 185,000 based on inlet ...
E. J. Walsh, M. R. D. Davies
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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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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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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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