Constructal optimization on T-shaped cavity based on entransy dissipation minimization

2009 ◽  
Vol 54 (23) ◽  
pp. 4418-4427 ◽  
Author(s):  
ZhiHui Xie ◽  
LinGen Chen ◽  
FengRui Sun
Keyword(s):  
Entransy Dissipation

Entransy dissipation minimization for generalized heat exchange processes

2016 ◽  
Vol 59 (10) ◽  
pp. 1507-1516 ◽  
Author(s):  
ShaoJun Xia ◽  
LinGen Chen ◽  
ZhiHui Xie ◽  
FengRui Sun
Keyword(s):  
Heat Exchange ◽  
Entransy Dissipation ◽  
Exchange Processes

scholarly journals Entransy dissipation minimization for optimization of heat exchanger design

2011 ◽  
Vol 56 (20) ◽  
pp. 2174-2178 ◽  
Author(s):  
XueFang Li ◽  
JiangFeng Guo ◽  
MingTian Xu ◽  
Lin Cheng
Keyword(s):  
Heat Exchanger ◽  
Entransy Dissipation ◽  
Heat Exchanger Design

scholarly journals Constructal Equivalent Thermal Resistance Minimization for Tau-Shaped Fin

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1206
Author(s):  
Shuhuan Wei ◽  
Huijun Feng ◽  
Lingen Chen ◽  
Yanlin Ge
Keyword(s):  
Thermal Resistance ◽  
Heat Transfer Performance ◽  
Constructal Theory ◽  
Width Ratio ◽  
Entransy Dissipation ◽  
Optimal Length ◽  
Entransy Theory ◽  
Engineering Designs ◽  
Material Volume ◽  
Maximum Thermal Resistance

With the aid of constructal theory and entransy theory, a Tau-shaped fin (TAUSF) is investigated in this paper, and the widths of the bend end and elemental fins are assumed to be different. The construct of the TAUSF is optimized by the minimum equivalent thermal resistance (ETR) obtained by entransy dissipation rate. The constraints of total enveloping volume and fin material volume are considered. The results show that in the specified range of width ratio, the twice minimum ETR of the TAUSF can be yielded by an optimal width ratio and an optimal length ratio. In addition, comparing the optimal performance of the TAUSF with the counterpart of a T-shaped fin, the former sacrifices a small amount of heat transfer performance and its stiffness increases due to its structure with the bend end. The optimal structure of the TAUSF yielded from ETR minimization is conspicuously different with the counterpart yielded from maximum thermal resistance minimization. Comparing the thermal performances of the two optimal constructs, the ETR of the former optimal construct is declined by 10.58%, whereas the maximum thermal resistance is augmented by 5.22%. The former optimal construct can lead to the uniformity of temperature gradient and the reduction in thermal stress, and can guide the engineering designs of practical fins.

scholarly journals Numerical Study on Heat Transfer Performance in Packed Bed

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 414 ◽  
Author(s):  
Shicheng Wang ◽  
Chenyi Xu ◽  
Wei Liu ◽  
Zhichun Liu
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Transfer Process ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Continuous Phase ◽  
Heat Transfer Process ◽  
Packed Beds ◽  
Transfer Performance ◽  
Entransy Dissipation

Packed beds are widely used in industries and it is of great significance to enhance the heat transfer between gas and solid states inside the bed. In this paper, numerical simulation method is adopted to investigate the heat transfer principle in the bed at particle scale, and to develop the direct enhanced heat transfer methods in packed beds. The gas is treated as continuous phase and solved by Computational Fluid Dynamics (CFD), while the particles are treated as discrete phase and solved by the Discrete Element Method (DEM); taking entransy dissipation to evaluate the heat transfer process. Considering the overall performance and entransy dissipation, the results show that, compared with the uniform particle size distribution, radial distribution of multiparticle size can effectively improve the heat transfer performance because it optimizes the velocity and temperature field, reduces the equivalent thermal resistance of convection heat transfer process, and the temperature of outlet gas increases significantly, which indicates the heat quality of the gas has been greatly improved. The increase in distribution thickness obviously enhances heat transfer performance without reducing the equivalent thermal resistance in the bed. The result is of great importance for guiding practical engineering applications.

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