Thermal performance and entropy generation of single‐layer and double‐layer constructal Y‐shaped bionic microchannel heat sinks

2021 ◽  
Author(s):  
Zhijian Duan ◽  
Gongnan Xie ◽  
Han Shen ◽  
Chi‐Chuan Wang
Keyword(s):  
Double Layer ◽  
Entropy Generation ◽  
Thermal Performance ◽  
Single Layer ◽  
Heat Sinks ◽  
Microchannel Heat Sinks

Effect of porous substrates on thermohydraulic performance enhancement of double layer microchannel heat sinks

2019 ◽  
Vol 131 ◽  
pp. 52-63 ◽  
Author(s):  
Ali Ghahremannezhad ◽  
Huijin Xu ◽  
Mohammad Alhuyi Nazari ◽  
Mohammad Hossein Ahmadi ◽  
Kambiz Vafai
Keyword(s):  
Double Layer ◽  
Performance Enhancement ◽  
Heat Sinks ◽  
Microchannel Heat Sinks ◽  
Porous Substrates

scholarly journals Analytical Analysis of Heat Transfer and Entropy Generation in a Tube Filled with Double-Layer Porous Media

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1214 ◽  
Author(s):  
Kun Yang ◽  
Wei Huang ◽  
Xin Li ◽  
Jiabing Wang
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Porous Media ◽  
Nusselt Number ◽  
Double Layer ◽  
Entropy Generation ◽  
Single Layer ◽  
Entropy Generation Rate ◽  
Total Entropy ◽  
Interfacial Radius

The heat transfer and entropy generation in a tube filled with double-layer porous media are analytically investigated. The wall of the tube is subjected to a constant heat flux. The Darcy-Brinkman model is utilized to describe the fluid flow, and the local thermal non-equilibrium model is employed to establish the energy equations. The solutions of the temperature and velocity distributions are analytically derived and validated in limiting case. The analytical solutions of the local and total entropy generation, as well as the Nusselt number, are further derived to analyze the performance of heat transfer and irreversibility of the tube. The influences of the Darcy number, the Biot number, the dimensionless interfacial radius, and the thermal conductivity ratio, on flow and heat transfer are discussed. The results indicate, for the first time, that the Nusselt number for the tube filled with double-layer porous media can be larger than that for the tube filled with single layer porous medium, while the total entropy generation rate for the tube filled with double-layer porous media can be less than that for the tube filled with single layer porous medium. And the dimensionless interfacial radius corresponding to the maximum value of the Nusselt number is different from that corresponding to the minimum value of the total entropy generation rate.

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