Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7056706 | International Journal of Heat and Mass Transfer | 2015 | 9 Pages |
Abstract
In this work, the secondary flow and recirculation flow motions initiated at the bifurcations and bends in symmetric fractal-like microchannel networks with two branching levels were studied through three-dimensional simulations. The effects of Reynolds number and aspect ratio on the vortices generation were investigated. And the influences of these flow behaviors on the hydrodynamic and thermal characteristics of the fractal-like microchannel networks were demonstrated. It was found that for a fractal-like microchannel network, both the flow rate and the aspect ratio have large influences on the evolution of the vortices which therefore promoted the fluid mixing and enhanced the efficiency of the heat transfer greatly. As a result, the fractal-like microchannel network with a smaller aspect ratio of 0.333 was verified to have the lowest pressure drop and highest heat transfer performance compared with the other microchannel networks under investigation in our study.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Chun-ping Zhang, Yi-fu Lian, Cheng-Hsing Hsu, Jyh-tong Teng, Sheng Liu, Yaw-Jen Chang, Ralph Greif,