Temperature spectra in shear flow and thermal convection

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Lohse, Detlef (1994) Temperature spectra in shear flow and thermal convection. Physics Letters A, 196 (1-2). pp. 70-75. ISSN 0375-9601

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Abstract:We show that the Pu(small omega, Greek) proportional to small omega, Greek¿7/3 shear velocity power spectrum gives rise to a P¿(small omega, Greek) proportional to small omega, Greek ¿4/3 power spectrum for a passively advected scalar, as measured in experiment [K. Sreenivasan, Proc. R. Soc. A 434 (1991) 165]. Applying our argument to high Rayleigh number Rayleigh-Benard flow, we can account for the measured scaling exponents equally well as the Bolgiano-Obukhov theory (BO59). Yet, of the two explanations, only the shear approach might be able to explain why no classical scaling range is seen in between the shear (or BO59) range and the viscous subrange of the experimental temperature spectrum
Item Type:Article
Copyright:© 1994 Elsevier
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/50337
Official URL:http://dx.doi.org/10.1016/0375-9601(94)91046-4
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