Random Roughness of Boundary Increases Turbulent Convection Scaling Exponent
chao-dyn
2009-10-31 v1 Chaotic Dynamics
Abstract
The influence of the boundary layer properties on the heat transport in turbulent thermal convection is experimentally investigated in a cell with a rough bottom plate.It is shown that the standard 2/7 exponent of the convective heat flow dependence on the Rayleigh number, usually observed in cell with smooth boundaries, increases if the roughness has power law distributed asperity heights and the thermal boundary layer thickness is smaller than the maximum asperity size. In contrast a periodic roughness does not influence the heat transportlaw exponent.
Keywords
Cite
@article{arxiv.chao-dyn/9904046,
title = {Random Roughness of Boundary Increases Turbulent Convection Scaling Exponent},
author = {S. Ciliberto and C. Laroche},
journal= {arXiv preprint arXiv:chao-dyn/9904046},
year = {2009}
}
Comments
8 pages, 4 figures, to be published in Phys. Rev. Lett