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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2019026914
Forthcoming Article

Laminar thermo-hydraulic characteristics in fractal tree-like microchannel networks

Cong Li
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, PR China
Wei-Biao Ye
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, PR China
Shuguang Gong
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, PR China
Si-Min Huang
Guangdong Provincial Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, PR China
Yuxiang Hong
Department of Chemistry and Chemical Engineering, Lishui University, Lishui 323000, PR China
Shunsheng Xu
Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, PR China

Краткое описание

The work focused on the hydraulic and thermal characteristics of fractal tree-like microchannels with variable hydraulic diameter, different bifurcation levels and hydraulic diameter ratios for the Reynolds numbers ranging from 124.4 to 622. To evaluate the comprehensive performances of the microchannel, the coefficient of performance is introduced based on pumping power and heat transfer rate. The thermal and hydraulic performances of eight different cases are discussed in terms of the mean heat transfer coefficient, pressure loss, thermal resistance and coefficient of performance. Results indicated that variable hydraulic diameters, higher bifurcation levels and hydraulic diameter ratios lead to an enhanced heat transfer at the expense of pressure loss. Furthermore, the hydraulic diameter ratio has the biggest influence on the mean heat transfer coefficient, pressure drop and coefficient of performance. The microchannel with variable hydraulic diameter, three bifurcation levels and the hydraulic diameter ratio is 1.618 can achieve a higher heat transfer performance but a lower coefficient of performance.