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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transport from a bluff body near a moving wall at Re = 100
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Heat transport from a bluff body near a moving wall at Re = 100

机译：在Re = 100时从壁壁附近的钝壁体传热

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摘要

Numerical simulations are performed for the flow and heat transfer from a stationary 2D square cylinder placed near a moving wall at Reynolds number 100 and cylinder-to-wall gap ratios in the range 0.1 ≤ G/D ≤ 4. The governing equations are solved using a finite volume method. Flow and thermal field resemble that of isolated case when the cylinder is far away from the moving wall. When G/D< 1, the twin vortex shedding pattern is transformed into single row of negative vortices and eventually the flow becomes steady when G/D < 0.3. Lift ((C)_L) and drag coefficient ((C)_D) of the cylinder are higher compared to that of an isolated cylinder. Strouhal number (St) of the cylinder increases with decrease in gap ratio from 4 to 1. With a further decrease in gap ratio, St reduces drastically before vanishing at G/D = 0.3 as a consequence of vortex shedding suppression. In general, the heat transfer rates are higher than the case of an isolated cylinder. The mean Nusselt number (Nu_M) increases with decrement in gap ratio. However, the trend is not the same. Nu_M increases gradually when GjD is varied from 4 to 0.5, while it suddenly decreases with decrement in GjD from 0.5 to 0.3 and again rises sharply for G/D ≤0.2. Results indicate that an enhancement of 27.45% in mean Nusselt number can be achieved, compared to the isolated case, by placing the cylinder at G/D = 0.1.
机译：对放置在运动壁附近的固定2D方筒的流动和传热进行了数值模拟，雷诺数为100，且筒壁间隙比在0.1≤G / D≤4的范围内。有限体积法。当圆柱体远离活动壁时，流场和热场类似于隔离情况。当G / D <1时，双涡旋脱落模式转变为单排的负涡旋，最终当G / D <0.3时，流量变得稳定。与孤立气缸相比，气缸的升程（（C）_L）和阻力系数（（C）_D）更高。随着间隙比从4减小到1，圆柱的Strouhal数（St）增大。随着间隙比的进一步减小，由于涡旋脱落的抑制，St在G / D = 0.3消失之前急剧减小。通常，传热速率高于隔离气缸的情况。平均努塞尔数（Nu_M）随着间隙比的减小而增加。但是，趋势并不相同。当GjD从4变为0.5时，Nu_M逐渐增加，而随着GjD从0.5减小到0.3，Nu_M突然减小，并且当G / D≤0.2时再次增大。结果表明，通过将圆柱体置于G / D = 0.1，与孤立的情况相比，平均Nusselt数可以提高27.45％。

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