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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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Entropy generation rate analysis in pendulum cart system undergoing damped oscillation
International Journal of Exergy, 2020A mechanical system consisting of a cart with slender rod is considered in this work for entropy generation rate investigation via a thermodynamic analysis. The dynamic model of the system is formulated using Lagrange's equation. Entropy generation rate is then introduced as the time derivative of the net-work potential of the system.
Amin A. Mohammed +2 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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Journal of Non-Equilibrium Thermodynamics, 2021
Abstract The entropy generation rate in a low dimensional film is formulated incorporating the heat flux and effective thermal conductivity of the film material. In the analysis, the mathematical formulation employed is kept the same as that used in the diffusive regime.
Saad Bin Mansoor, Bekir S. Yilbas
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Abstract The entropy generation rate in a low dimensional film is formulated incorporating the heat flux and effective thermal conductivity of the film material. In the analysis, the mathematical formulation employed is kept the same as that used in the diffusive regime.
Saad Bin Mansoor, Bekir S. Yilbas
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Turbine Blade Entropy Generation Rate: Part I — The Boundary Layer Defined
Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration, 2000The profile loss of a gas turbine blade is normally associated with the entropy increase due to the boundary layer phenomena of viscous shear, Reynolds stress generation and heat transfer. To establish the relative contributions of laminar, transitional and turbulent adiabatic boundary layer flow, to the overall entropy generation (as described in part
M. R. D. Davies +2 more
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