title: Heat transport by fluid flows with prescribed velocity fields.
abstract: We study the problem of heat transport by fluid flows with prescribed velocity fields. The advection-diffusion equation in two dimensions is solved for two velocity fields: (i). a circulation and (ii). a shear flow. These two flows focus separately on the two dominant features of the mean large-scale flow observed in turbulent convection experiments. We find that the Nusselt number, which measures the heat transport, scales respectively for the two velocity fields.
authors.affiliation: Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong.
authors.forename: E S
authors.initials: ES
authors.lastname: Ching
authors.forename: K F
authors.initials: KF
authors.lastname: Lo