How surface roughness reduces heat transport for small roughness heights in turbulent Rayleigh-Bénard convection
How surface roughness reduces heat transport for small roughness heights in turbulent Rayleigh-Bénard convection
复制标题
表面粗糙度如何减少湍流瑞利-贝纳德对流中小粗糙度高度的热传输
DOI：
10.1017/jfm.2017.786
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
Zhou Quan
中科院分区：
文献类型：
--
作者：
Zhang Yi-Zhao;Sun Chao;Bao Yun;Zhou Quan
Rough surfaces have been widely used as an efficient way to enhance the heat-transfer efficiency in turbulent thermal convection. In this paper, however, we show that roughness does not always mean a heat-transfer enhancement, but in some cases it can also reduce the overall heat transport through the system. To reveal this, we carry out numerical investigations of turbulent Rayleigh–Bénard convection over rough conducting plates. Our study includes two-dimensional (2D) simulations over the Rayleigh number range reduction is that the hot/cold fluid is trapped and accumulated inside the cavity regions between the rough elements, leading to a much thicker thermal boundary layer and thus impeding the overall heat flux through the system.
