Bounds on heat transfer by incompressible flows between balanced sources and sinks

Abstract

Internally heated convection involves the transfer of heat by fluid motion between a distribution of sources and sinks. Focusing on the balanced case where the total heat added by the sources matches the heat taken away by the sinks, we obtain \emph{a priori} bounds on the minimum mean thermal dissipation $⟨|\nabla T{|}^2⟩$ as a measure of the inefficiency of transport. In the advective limit, our bounds scale with the inverse mean kinetic energy of the flow. The constant in this scaling law depends on the source--sink distribution, as we explain both in a pair of examples involving oscillatory or concentrated heating and cooling, and via a general asymptotic variational principle for optimizing transport. Key to our analysis is the solution of a pure advection equation, which we do to find examples of extreme heat transfer by cellular and `pinching' flows. When the flow obeys a momentum equation, our bound is re-expressed in terms of a flux-based Rayleigh number $Ra$ yielding $⟨|\nabla T{|}^2⟩\ge CR{a}^{-\alpha }$. The power $\alpha$ is $0,2/3$ or $1$ depending on the arrangement of the sources and sinks relative to gravity.

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Cited by in corpus (4)

• Internal heating profiles for which downward conduction is impossible
• Rigorous scaling laws for internally heated convection at infinite Prandtl number
• Internally heated convection with rotation: bounds on heat transport
• Enhancing wall-to-wall heat transport with unsteady flow perturbations