Numerical investigations of double diffusive mixed convection in enclosure

doi:10.3969/j.issn.0438-1157.2014.z1.018

CIESC Journal ›› 2014, Vol. 65 ›› Issue (S1): 111-118.DOI: 10.3969/j.issn.0438-1157.2014.z1.018

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Numerical investigations of double diffusive mixed convection in enclosure

XU Hongtao¹, XIAO Ruixue¹, YAN Zhenrong², SHAO Bin¹, YANG Mo¹

1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Shanghai Institute of Special Equipment Inspection & Technical Research, Shanghai 200062, China

Received:2014-01-22 Revised:2014-01-28 Online:2014-05-30 Published:2014-05-30
Supported by:
supported by the National Natural Science Foundation of China (51276117) and the Shanghai Institute of Special Equipment Inspection & Technical Research(2012-12).

方腔内双扩散混合对流数值模拟

徐洪涛¹, 肖瑞雪¹, 严祯荣², 邵斌¹, 杨茉¹

1. 上海理工大学能源与动力工程学院, 上海 200093;
2. 上海市特种设备监督检验技术研究院, 上海 200062

通讯作者: 徐洪涛
基金资助:
国家自然科学基金项目（51276117）；上海市质量技术监督局公益科研项目（2012-12）。

Abstract

Abstract: The double diffusive mixed convection around a heated cylinder in an enclosure was numerically studied. The heated cylinder was located at the center of the enclosure with high temperature and concentration. The inlet flow with low temperature and concentration was located at the lower-left wall of the enclosure and the exit was at the upper-right wall. First, the influences of Richardson number (Ri) on the interior flow characteristics were presented. It showed that the oscillation phenomenon occurred at Ri=0.001. At Ri=1.0, the flow was in a steady state. Then, the influences of Lewis number (Le) and buoyancy ratio (Br) on the double diffusive mixed convection were investigated while the Richardson number was kept constant at 1.0. The average Nusselt number Nu_avand Sherwood number Sh_av were reported. The current study can provide the theoretical supports for the pollutant control, thermal comfort or smoke control in space.

Key words: numerical simulation, double diffusion, mixed convection, enclosure, heated cylinder

摘要： 对内置发热圆的方腔内双扩散混合对流现象进行了数值模拟研究。发热圆位于方腔中心，流体从方腔左侧底部流进，右侧顶部流出。首先，分析了在不同Richardson数Ri下方腔内的流动特性，发现Ri=0.001时方腔内部流动出现了振荡现象，而Ri=1.0时流动处于稳定状态。其次，研究了流动处于稳定状态时，Lewis数Le及浮升力比Br对方腔内双扩散混合对流的影响，得出平均Nusselt数Nu_av和平均Sherwood数Sh_av随着Le及Br的变化规律，可为空间内部污染物处理、热舒适性研究以及烟气控制等提供理论参考。

关键词: 数值模拟, 双扩散, 混合对流, 方腔, 发热圆

CLC Number:

TK124

XU Hongtao, XIAO Ruixue, YAN Zhenrong, SHAO Bin, YANG Mo. Numerical investigations of double diffusive mixed convection in enclosure[J]. CIESC Journal, 2014, 65(S1): 111-118.

徐洪涛, 肖瑞雪, 严祯荣, 邵斌, 杨茉. 方腔内双扩散混合对流数值模拟[J]. 化工学报, 2014, 65(S1): 111-118.

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Numerical investigations of double diffusive mixed convection in enclosure

方腔内双扩散混合对流数值模拟

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