Lattice Boltzmann Simulation of Double Diffusive Natural Convection in a Square Enclosure Filled With Porous Medium
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摘要: 采用格子Boltzmann方法,对4个壁面均为低温、低浓度,内置高浓度发热圆的充满均匀多孔介质的方腔内双扩散自然对流现象进行了数值模拟研究.分析了Darcy(达西)数Da(10-4≤Da≤10-2)和浮升力比B(-5.0≤B≤5.0)对内部发热圆表面平均Nusselt(努赛尔)数Nuav和平均Sherwood(舍伍德)数Shav的影响.模拟结果表明:除B=-1.0时,Nuav和Shav随Da的增加而增大;当-5.0<B<5.0,在Da=10-4时,Nuav和Shav几乎不受B变化的影响;在Da=10-3和Da=10-2时,Nuav和Shav随B的增加先减小后增大,在B=-1.0时取得最小值
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关键词:
- 方腔 /
- 多孔介质 /
- 双扩散自然对流 /
- 格子Boltzmann /
- 数值模拟
Abstract: The lattice Boltzmann method was adopted to investigate the double diffusive natural convection in a square enclosure filled with porous medium. The temperature and concentration on surrounding walls were low and those on the inner heat cylinder surface were high. The influences of Darcy number Da(10-4≤Da≤10-2) and buoyancyratio B(-5.0≤B≤5.0) on average Nusselt number Nuav and Sherwood number Shav on the heat cylinder surface were studied. The results indicate that both Nuav and Shav increase with Da except for the case of B=-1.0,and both Nuav and Shav are almost independent of B for Da=10-4.Both Nuav and Shav first decrease and then increase with B increasing from -5.0 to 5.0 for Da=10-3 and 10-2 and reach the minimal value for B=-1.0. -
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