Steady axisymmetric creeping plumes above a planar boundary. Part 2. A distributed source

Robert J. Whittaker, John R. Lister

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22 Citations (Scopus)

Abstract

Asymptotic solutions are obtained for an axisymmetric plume rising from a localized heat source at the base of a half-space filled with very viscous fluid. Specifically, we consider sources comprising a heated disk with either rigid (no-slip) or free-slip (no tangential stress) conditions on the lower boundary. The boundary layer which forms above the source is solved using stretched coordinates, and then matched to a slender plume which rises above it. At large Rayleigh numbers, the Nusselt number is given by $Nu \sim 4.06 Ra^{1/3}(\ln Ra)^{-1/3}$ (free-slip boundary) and $Nu \sim 2.90 Ra^{1/5}$ (rigid boundary), where the Rayleigh number is based on the radius of the source. Both these expressions have corrections arising from a slender-body expansion in powers of $(\ln Ra)^{-1}$.
Original languageEnglish
Pages (from-to)379-397
Number of pages19
JournalJournal of Fluid Mechanics
Volume567
DOIs
Publication statusPublished - 2006

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