TY - JOUR
T1 - Development of a new heat transfer optimization method for compressible fluid flows and it numerical verifications
AU - Sun, Meng He
AU - Zhang, Xin Rong
AU - Chen, Lin
N1 - Funding Information:
The support of National Science Foundation of China (No. 51276001 ) and the Common Development Fund of Beijing are gratefully acknowledged.
Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - A general optimization criterion for heat transfer process is developed based on the entransy theory. Then, a modified field synergy principle for compressible viscous fluid, which represents the irreversibility of the specific heat transfer processes, is discussed. Modified field synergy equations are set up and theoretically, the solution of the modified field synergy equations under the constraint conditions of a given mean kinetic energy is able to show the optimal flow field, in which the amount of heat transfer is maximized. In the study, a numerical simulation of the heat transfer processes of air in a cavity is selected as the numerical verification of the modified field synergy equations. Numerical simulation results show that asymmetric vortices are generated in the flow field due to the variation of the density. These vortices enhance the heat transfer performance in the absence of too much work dissipation. Comparisons among the results of the Navier-Stokes equations, the existed laminar field synergy equations, and the modified field synergy equations are made. The results confirm that the equations developed in this study correspond to the best heat-transfer performance when the density of fluid changes with temperature or pressure.
AB - A general optimization criterion for heat transfer process is developed based on the entransy theory. Then, a modified field synergy principle for compressible viscous fluid, which represents the irreversibility of the specific heat transfer processes, is discussed. Modified field synergy equations are set up and theoretically, the solution of the modified field synergy equations under the constraint conditions of a given mean kinetic energy is able to show the optimal flow field, in which the amount of heat transfer is maximized. In the study, a numerical simulation of the heat transfer processes of air in a cavity is selected as the numerical verification of the modified field synergy equations. Numerical simulation results show that asymmetric vortices are generated in the flow field due to the variation of the density. These vortices enhance the heat transfer performance in the absence of too much work dissipation. Comparisons among the results of the Navier-Stokes equations, the existed laminar field synergy equations, and the modified field synergy equations are made. The results confirm that the equations developed in this study correspond to the best heat-transfer performance when the density of fluid changes with temperature or pressure.
KW - Compressible fluid
KW - Entransy dissipation
KW - Field synergy equation
KW - Optimization
KW - Variable property
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U2 - 10.1016/j.ijheatmasstransfer.2016.04.051
DO - 10.1016/j.ijheatmasstransfer.2016.04.051
M3 - Article
AN - SCOPUS:84966340202
VL - 100
SP - 267
EP - 275
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -