The mechanism of heat transport in thermal convection at high Rayleigh numbers
The mechanism of heat transport in thermal convection at high Rayleigh numbers
复制标题
高瑞利数热对流中的热传输机制
DOI：
10.1063/1.857383
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发表时间：
1989
影响因子：
4.6
通讯作者：
Kunio Watanabe
中科院分区：
文献类型：
--
作者：
T. Asaeda;Kunio Watanabe
通过流动显示技术和温度测量，研究了高瑞利数自由对流的小尺度结构。流场的主要特征是由多个热源组成的片状羽流，它们将热量从导电层输送到内部区域。结果表明，边界热流密度和流体性质决定了热物质的平均特性，即(A)与产生热物质的边界的距离，(B)热物质输送的过量温度，(C)流体在热物质中的上升速度，以及(D)热物质的水平尺寸。速度起伏和热传递速率可以通过这些特征值来解释。
The small scale structure of free convection at high Rayleigh number was investigated by a flow visualization technique and temperature measurements. The dominant feature of the flow field was many sheetlike plumes consisting of several thermals, which transport heat from the conduction layer to the interior region. It was found that the boundary heat flux and the fluid’s properties determine the average characteristics of the thermals, namely, (a) the distance from the boundary where the thermals are generated, (b) the temperature excess transported by thermals, (c) the upward velocity of the fluid in a thermal, and (d) the horizontal dimension of the thermal. Velocity fluctuations and the heat transport rate can be explained through these characteristic values.