Rayleigh-Bénard湍流热对流系统中由内置隔板导致的湍流热输运增加
首发时间:2013-01-14
摘要:采用长方体对流槽,在以水为对流介质的Rayleigh-Bénard(RB)湍流热对流系统中,通过往对流槽中加入隔板的方式改变宽高比,研究其对系统传热Nu~Ra关系的影响。对流槽宽高比为(Γx,Γy)=(5,1.5),(2.44,1.5),(1.587,1.5),(1.16,1.5),(0.904,1.5)和(0.6114,1.5),实验参数Rayleigh数、Prantl数变化区间在3×107≤Ra≤1×109和5.20≤Pr≤5.30之间。结果表明,与之前矩形对流槽实验结果不同,随着加入隔板的数量增加,系统传热效率出现明显增加。
关键词: 关Rayleigh-Bénard 湍流热对流 隔板 宽高比 对流传热
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Heat transport enhancement induced by partition plates in turbulent Rayleigh-Bénard convection
Abstract:This paper reports high-precision measurements of the Nusselt(Nu) number as a function of the Rayleigh (Nu) number,which in water-filled rectangular cell Rayleigh-Bénard(RB)convection cells of aspect ratios via inserting partition plates into it. Aspect ratios are (Γx,Γy)=(5,1.5),(2.44,1.5),(1.587,1.5),(1.16,1.5),(0.904,1.5)and(0.6114,1.5),over the Rayleigh number ranges 3×107≤Ra≤1×109 and the Prantl number ranges 5.20≤Pr≤5.30.The result shows that,unlike the situation in previous rectangular cells, the system of the heat transport increases significantly with the number of partition plates increasing.
Keywords: Rayleigh-Bénard turbulent thermal convection partition plate aspect ratio heat transport
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