Publication de 6 numéros par an
ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110
Indexed in
LAMINAR THERMO-HYDRAULIC CHARACTERISTICS IN FRACTAL TREE-LIKE MICROCHANNEL NETWORKS
RÉSUMÉ
This study focuses on the hydraulic and thermal characteristics of fractal tree-like microchannels with variable hydraulic diameters, bifurcation levels, and hydraulic diameter ratios for the Reynolds numbers ranging from 124.4 to 622. To evaluate the microchannel performances, the coefficient of performance is 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 indicate 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 greatest 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 of 1.618 can achieve a higher heat transfer performance, while a lower coefficient of performance is obtained.
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