Random Roughness of Boundary Increases Turbulent Convection Scaling Exponent

Details Random Roughness of Boundary Increases Turbulent Convection Scaling Exponent Random Roughness of Boundary Increases Turbulent Convection Scaling Exponent

1999-04-26

arxiv.org/abs/chao-dyn/9904046v1

Nonlinear Sciences

Chaotic Dynamics

8 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.3998

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.

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