Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient

K. Oduyemi, R. E. Britter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Transport of a passive scalar contaminant in nearly isotropic non-decaying turbulence was first studied theoretically by Corrsinl, and in that study it was predicted that an imposed passive linear cross-stream mean temperature profile will maintain itself and will be independent of the downstream distance. Corrsin’s prediction of constancy of the cross-stream temperature gradient, ß, has been confirmed experimentally for decaying turbulent flows2,3,4. Despite the constancy of ß there has been confusing experimental data on the streamwise evolution of passive scalar contaminants. The heated grid method used by Wiskind2 to study the streamwise evolution of passive scalar has been found to be far from ideal because significant transverse variation of temperature variance was observed in Wiskind’s data3,4. The use of differentially heated screens downstream of a grid3,4 has aided the study of the streamwise evolution of passive scalar fluctuations, but there still remains some uncertainties in the physics of this type of flow particularly at large decay times.
Original languageEnglish
Title of host publicationAdvances in turbulence 2
Subtitle of host publicationProceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988
EditorsHans-Hermann Fernholz, Heinrich E. Fiedler
Place of PublicationBerlin
PublisherSpringer-Verlag
Pages186-191
Number of pages6
ISBN (Electronic)9783642838224
ISBN (Print)9783642838248
DOIs
Publication statusPublished - 1989
Externally publishedYes
EventSecond European Turbulence Conference - Berlin, Germany
Duration: 30 Aug 19882 Sep 1988
Conference number: 2nd

Conference

ConferenceSecond European Turbulence Conference
CountryGermany
CityBerlin
Period30/08/882/09/88

Fingerprint

homogeneous turbulence
stratification
scalars
gradients
contaminants
temperature profiles
temperature gradients
turbulence
grids
physics
decay
predictions
temperature

Cite this

Oduyemi, K., & Britter, R. E. (1989). Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient. In H-H. Fernholz, & H. E. Fiedler (Eds.), Advances in turbulence 2: Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988 (pp. 186-191). Berlin: Springer-Verlag. https://doi.org/10.1007/978-3-642-83822-4_30
Oduyemi, K. ; Britter, R. E. / Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient. Advances in turbulence 2: Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988. editor / Hans-Hermann Fernholz ; Heinrich E. Fiedler. Berlin : Springer-Verlag, 1989. pp. 186-191
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title = "Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient",
abstract = "Transport of a passive scalar contaminant in nearly isotropic non-decaying turbulence was first studied theoretically by Corrsinl, and in that study it was predicted that an imposed passive linear cross-stream mean temperature profile will maintain itself and will be independent of the downstream distance. Corrsin’s prediction of constancy of the cross-stream temperature gradient, {\ss}, has been confirmed experimentally for decaying turbulent flows2,3,4. Despite the constancy of {\ss} there has been confusing experimental data on the streamwise evolution of passive scalar contaminants. The heated grid method used by Wiskind2 to study the streamwise evolution of passive scalar has been found to be far from ideal because significant transverse variation of temperature variance was observed in Wiskind’s data3,4. The use of differentially heated screens downstream of a grid3,4 has aided the study of the streamwise evolution of passive scalar fluctuations, but there still remains some uncertainties in the physics of this type of flow particularly at large decay times.",
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Oduyemi, K & Britter, RE 1989, Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient. in H-H Fernholz & HE Fiedler (eds), Advances in turbulence 2: Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988. Springer-Verlag, Berlin, pp. 186-191, Second European Turbulence Conference, Berlin, Germany, 30/08/88. https://doi.org/10.1007/978-3-642-83822-4_30

Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient. / Oduyemi, K.; Britter, R. E.

Advances in turbulence 2: Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988. ed. / Hans-Hermann Fernholz; Heinrich E. Fiedler. Berlin : Springer-Verlag, 1989. p. 186-191.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T1 - Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient

AU - Oduyemi, K.

AU - Britter, R. E.

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N2 - Transport of a passive scalar contaminant in nearly isotropic non-decaying turbulence was first studied theoretically by Corrsinl, and in that study it was predicted that an imposed passive linear cross-stream mean temperature profile will maintain itself and will be independent of the downstream distance. Corrsin’s prediction of constancy of the cross-stream temperature gradient, ß, has been confirmed experimentally for decaying turbulent flows2,3,4. Despite the constancy of ß there has been confusing experimental data on the streamwise evolution of passive scalar contaminants. The heated grid method used by Wiskind2 to study the streamwise evolution of passive scalar has been found to be far from ideal because significant transverse variation of temperature variance was observed in Wiskind’s data3,4. The use of differentially heated screens downstream of a grid3,4 has aided the study of the streamwise evolution of passive scalar fluctuations, but there still remains some uncertainties in the physics of this type of flow particularly at large decay times.

AB - Transport of a passive scalar contaminant in nearly isotropic non-decaying turbulence was first studied theoretically by Corrsinl, and in that study it was predicted that an imposed passive linear cross-stream mean temperature profile will maintain itself and will be independent of the downstream distance. Corrsin’s prediction of constancy of the cross-stream temperature gradient, ß, has been confirmed experimentally for decaying turbulent flows2,3,4. Despite the constancy of ß there has been confusing experimental data on the streamwise evolution of passive scalar contaminants. The heated grid method used by Wiskind2 to study the streamwise evolution of passive scalar has been found to be far from ideal because significant transverse variation of temperature variance was observed in Wiskind’s data3,4. The use of differentially heated screens downstream of a grid3,4 has aided the study of the streamwise evolution of passive scalar fluctuations, but there still remains some uncertainties in the physics of this type of flow particularly at large decay times.

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Oduyemi K, Britter RE. Molecular and stratification effects on the evolution of concentration fluctuations in decaying homogeneous turbulence with transverse mean-concentration gradient. In Fernholz H-H, Fiedler HE, editors, Advances in turbulence 2: Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988. Berlin: Springer-Verlag. 1989. p. 186-191 https://doi.org/10.1007/978-3-642-83822-4_30