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  • Journal of Fluid Mechanics, Volume 540
  • October 2005, pp. 49-73

An experimental study on thermal circulation driven by horizontal differential heating

  • WEI WANG (a1) and RUI XIN HUANG (a2)
  • DOI:
  • Published online: 27 September 2005

Circulation driven by horizontal differential heating is studied, using a double-walled Plexiglas tank $(20 \,{\times}\, 15\,{\times}\, 2.5$cm$^3$) filled with salt water. For instances of heating/cooling from above and below, results indicate that there is always quasi-equilibrium circulation. In contrast to most previous results from experimental/numerical studies, circulation in our experiments appears in the form of a shallow cell adjacent to the boundary of thermal forcing. The non-dimensional stream-function maximum confirms the 1/5-power law of Rossby, $\Psi\,{\sim}\,Ra^{1/5}_L$. Dissipation rate measured in the experiments appears to be consistent with theory.

For cases of heating/cooling from a sloping bottom, circulation is similar to cases with a flat bottom; circulation is strong if heating is below cooling, but it is rather weak if heating is above cooling. Nevertheless, circulation in all cases is visible to the naked eye.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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