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Fluctuations and transport in a stirred fluid with a mean gradient

Gollub, J. P. and Clarke, J. and Gharib, M. and Lane, B. and Mesquita, O. N. (1991) Fluctuations and transport in a stirred fluid with a mean gradient. Physical Review Letters, 67 (25). pp. 3507-3510. ISSN 0031-9007. doi:10.1103/PhysRevLett.67.3507.

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The effective thermal diffusivity D* and the probability distribution of temperature fluctuations are measured in a stirred fluid across which a temperature gradient is maintained. A distinct mixing transition is observed for D* as a function of Reynolds number R. Above the transitions, the distribution is strongly non-Gaussian and approaches an exponential exp(-‖δT‖/βξ), where β is the local temperature gradient and ξ the correlation length.

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Additional Information:© 1991 The American Physical Society. Received 18 September 1991. The authors thank B. Shraiman and E. Siggia for suggesting this experiment and for helpful discussions. We also appreciate discussions with R. Kraichnan and Z.-S. She. S. Gaudio built the apparatus. The research was supported by DARPA/URI under Contracts No. N000-14-86-K-0758 and No. N00015-85-K-0759. O.N. M. acknowledges partial support from the Brazilian agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Brazil)UNSPECIFIED
Issue or Number:25
Record Number:CaltechAUTHORS:20130913-105647709
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41320
Deposited By: Tony Diaz
Deposited On:16 Sep 2013 21:11
Last Modified:10 Nov 2021 04:28

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