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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural convection in differentially heated rectangular cavities with time periodic boundary condition on one side
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Natural convection in differentially heated rectangular cavities with time periodic boundary condition on one side

机译：一侧具有时间周期边界条件的差热矩形腔中的自然对流

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摘要

Natural convection in differentially heated rectangular cavities has been investigated. One of the vertical walls of the cavity is cooled, and the opposing vertical wall is heated. The cold and hot vertical walls have constant and time periodic temperatures, respectively. The other four walls are adiabatic. Heat transfer is by convection only because surface emissivities of the walls have been reduced. Experiments are performed on rectangular cavities with aspect ratios of 1, 2.09, 3, 4, 5 and 6. All six cavities have a height of 340 mm and a depth of 210 mm. The cavity length is changed to obtain different rectangular cavities. The cavity is closed and filled with air. Thermocouples are used to measure the temperature. For each cavity, the temperature distribution between the cold and the hot vertical walls is obtained at 35 positions along the length, three positions along the height and one position along the depth directions. The contour maps of the dimensionless temperature are presented at the mid-depth of the cavity. The local temperature difference is highest, and the local Nusselt number is lowest at the mid-height. Heat transfer correlations are presented for the Rayleigh number range of 4.51 x 10(5)-1.13 x 10(8), and for the aspect ratio range of 1-6. The Nusselt number largely decreases when the temperature on the heated wall is changed from constant to sinusoidally varying. (C) 2018 Elsevier Ltd. All rights reserved.
机译：已经研究了差热矩形腔中的自然对流。腔的垂直壁之一被冷却，并且相对的垂直壁被加热。冷垂直壁和热垂直壁分别具有恒定的温度和时间周期性的温度。其他四壁是绝热的。仅由于壁的表面发射率降低，才通过对流进行热传递。在长宽比分别为1、2.09、3、4、5和6的矩形腔体上进行实验。所有六个腔体的高度为340 mm，深度为210 mm。改变腔的长度以获得不同的矩形腔。空腔被封闭并充满空气。热电偶用于测量温度。对于每个腔，在沿纵向的35个位置，沿高度的三个位置和沿深度方向的一个位置处获得冷壁和热壁之间的温度分布。无因次温度的等高线图显示在型腔的中深度。局部温度差最高，而局部Nusselt数在中间高度最低。给出了瑞利数范围为4.51 x 10（5）-1.13 x 10（8）和纵横比范围为1-6的传热相关性。当加热壁上的温度从恒定变化为正弦变化时，Nusselt值会大大降低。 （C）2018 Elsevier Ltd.保留所有权利。

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