Double dispersion, natural convection in an open end cavity simulation via Lattice Boltzmann Method
Double dispersion, natural convection in an open end cavity simulation via Lattice Boltzmann Method
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DOI：
10.1016/j.ijthermalsci.2010.05.022
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发表时间：
2010-10
影响因子：
4.5
通讯作者：
A. Mohamad;R. Bennacer;M. El‐Ganaoui
中科院分区：
文献类型：
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作者：
A. Mohamad;R. Bennacer;M. El‐Ganaoui
采用格子玻尔兹曼方法（LBM）模拟了开口腔中的双色散。流动由浮力效应驱动，浮力效应是由于加热的垂直壁和在腔体的加热壁（封闭端）处的物质浓度引起的。本文的目的是解决物理的流动，传热和传质在开口端腔和封闭端槽。对于104、105和106的热瑞利数（RaT），普朗特数（Pr）固定为0.71（空气）。结果是中等刘易斯数为2，4和8和范围内的浮力比，N，（物种热）。物质浓度引起的浮力或者辅助或者对抗热驱动流，这由浮力比的值（分别为正或负）确定。有趣的流动模式预测相反的浮力。
Double dispersion in an open end cavities are simulated using Lattice Boltzmann Method (LBM). The flow is driven by the buoyancy effect due to the heated vertical wall and species concentration at the heated wall of the cavity (closed end). The paper is intended to address the physics of flow, heat and mass transfers in open ended cavities and close end slots. Prandtl number (Pr) is fixed to 0.71 (air) for the thermal Rayleigh number (RaT) of 104, 105and 106. The results are presented for moderate Lewis number of 2, 4 and 8 and for a range of buoyancy ratio, N, (species to thermal). The species concentration induced buoyancy force either aids or opposes the thermally driven flow, which is determined by the value of buoyancy ratio (positive or negative, respectively). Interesting flow patterns were predicted for opposing buoyancy forces.