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首页> 外文期刊>International Journal of Heat and Mass Transfer >Gas flow in micro tree-shaped hierarchical network
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Gas flow in micro tree-shaped hierarchical network

机译：微型树状分层网络中的气流

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摘要

A lattice Boltzmann model of gas flow in tree-shaped microchannel network is developed and numerically analyzed to investigate the behaviors of gas flow and boundary velocity slip in tree-shaped hierarchical network. The rarefaction effect, multiscale effect and bifurcation effect are all examined and analyzed. The velocity and pressure distributions, Poiseuille number and effective slip length in hierarchical networks are presented. The results indicate that the gas flow behavior in tree-shaped microchannel network is dependent on the rarefaction effect, multiscale effect and bifurcation effect. The boundary slip velocity along the streamwise decreases in a stepwise fashion, but the velocity slip degree owing to rarefaction effect intensifies with increasing branching level. The abrupt rise and fall of slip velocity as well as slight pressure recovery is observed at the bifurcations. In multi-scale tree-shaped hierarchical network, increases in branching level lead to larger Knudsen number, which induce larger effective slip length and smaller Poiseuille number. In addition, the gas rarefaction effects are enhanced when the width exponent of tree-shaped microchannel tends to be smaller in the hierarchical network.
机译：建立了树状微通道网络中气流的格子Boltzmann模型，并对其进行了数值分析，以研究树状分层网络中的气体流动和边界速度滑移行为。对稀疏效应，多尺度效应和分叉效应都进行了分析。给出了分层网络中的速度和压力分布，泊松数和有效滑移长度。结果表明，树状微通道网络中的气体流动行为取决于稀疏效应，多尺度效应和分叉效应。沿河道的边界滑移速度呈阶梯状降低，但由于稀疏效应而导致的速度滑移度随分支水平的增加而增强。在分叉处观察到滑移速度的突然上升和下降以及轻微的压力恢复。在多尺度树状分层网络中，分支级别的增加导致更大的克努森数，从而导致更大的有效滑移长度和较小的泊瓦数。另外，当树状微通道的宽度指数在分层网络中趋于较小时，气体稀疏效果得到增强。

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  • 来源
  • 作者

    Yongping Chen; Zilong Deng;

  • 作者单位

    School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, PR China,Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas flow; Tree-shaped; MicroChannel; Slip;

    机译：气体流量树形微通道;滑;

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