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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Behaviors of Gas Flow in Tree-Shaped Microchannel Networks

Get access (open in a dialog) DOI: 10.1615/IHTC15.nmm.009503
pages 5507-5513

Аннотация

The tree-shaped microchannel networks are found to be promising tools to realize the great efficiency in heat and mass transfer in microflow systems. In this paper, a two-dimensional model for flow through a treeshaped microchannel is developed and numerically analyzed to investigate the behaviors of flow in hierarchical network. The bifurcation effect, rarefaction effect and size effect on flow in microchannel networks are obtained by means of lattice Boltzmann method. The results indicate that, for gas flow in treeshaped microchannel networks, the velocity profiles in parabolic shape of gas flowing in different level microchannels recover the expected flow behavior from continuum hydrodynamics with varying boundary slip velocity. In addition, no swirl patterns and secondary flow are observed at bifurcations in tree-shaped structure, which is different from liquid flow in tree-shaped structure. In particular, the rarefaction effect is enhanced in higher-order level microchannels, which highlights the velocity slip and hence contributes to a less energy loss.