Effects of roughness elements on laminar flow and heat transfer in microchannels
作者： Chengbin Zhang , Yongping Chen , Mingheng Shi
DOI: 10.1016/J.CEP.2010.08.022
关键词:
摘要: A model of laminar flow and heat transfer in rough microchannels is developed analyzed numerically to compare the effect roughness elements on thermal hydrodynamic characteristics. In this model, surfaces are configured with triangular, rectangular semicircular elements, respectively. Here, effects Reynolds number, height, element spacing pressure drop all investigated discussed. The results indicate that global performance improved by at expense head when compared smooth channel. Differing from microchannels, both Poiseuille number average Nusselt no longer constant numbers larger than classical value. Especially, difference three types identified. With increasing over triangular induces stronger recirculation separation. This contributes enhancement but also increases drop. However, influence height weaker elements. addition, decreasing order for semicircular,
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