Variation of temperature and velocity fluctuations in turbulent thermal convection over horizontal surfaces

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The variations of root-mean-square (r.m.s.) temperature and velocity in turbulent thermal convection above a heated, horizontal surface are analyzed by extending the arguments of Castaing et al. ([1]: J. Fluid Mech. 204, 1-30 (1989)) which lead to the two-sevenths power law for heat transfer. Asymptotic matching of properties scaled on Deardoff's convection scales with those scaled on Castaing et al.'s lambda-layer show that the r.m.s. temperature decays as z-1/2 and the r.m.s. vertical velocity increases as log z. These results are supported by data from Rayleigh convection and unsteady convection, both penetrative and non-penetrative.

Original languageEnglish (US)
Pages (from-to)2303-2310
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Issue number11
Publication statusPublished - Jul 1996
Externally publishedYes


ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy(all)
  • Mechanical Engineering
  • Engineering(all)

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