EFFECT OF STAGNANT CONDUCTIVITY ON NON-DARCIAN MIXED CONVECTION IN HORIZONTAL SQUARE PACKED CHANNELS

被引:13
作者
CHOU, FC
CHUNG, PY
机构
[1] Department of Mechanical Engineering, National Central University, Chung-li
关键词
D O I
10.1080/10407789508913696
中图分类号
O414.1 [热力学];
学科分类号
摘要
This paper presents a numerical study of stagnant conductivity effect on the fully developed non-Darcian mixed convection in horizontal packed-sphere channels. The effect of stagnant conductivity is characterized by the conductivity ratio of solid sphere to fluid (k(s)/k(f)). The results show that the buoyancy effect affects significantly the secondary flow structure and heat transfer rate when k(s)/k(f) and Peclet number are all low. But under a fixed Rayleigh number, the effect of buoyancy will be suppressed when the value of k(s)/k(f) or Peclet number increases. The critical Rayleigh number for the onset of buoyancy effect is shown to increase more than 1 order of magnitude when k(s)/k(f) increases from 1.3 to 26.8 or 38.8 at low Peclet number.
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页码:195 / 209
页数:15
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