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

K. Oduyemi; R. E. Britter

doi: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

K. Oduyemi, R. E. Britter

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 flows^2,3,4. 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 data^3,4. The use of differentially heated screens downstream of a grid^3,4 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 language	English
Title of host publication	Advances in turbulence 2
Subtitle of host publication	Proceedings of the second European turbulence conference Berlin, August 30 – September 2, 1988
Editors	Hans-Hermann Fernholz, Heinrich E. Fiedler
Place of Publication	Berlin
Publisher	Springer-Verlag
Pages	186-191
Number of pages	6
ISBN (Electronic)	9783642838224
ISBN (Print)	9783642838248
DOIs	https://doi.org/10.1007/978-3-642-83822-4_30
Publication status	Published - 1989
Externally published	Yes
Event	Second European Turbulence Conference - Berlin, Germany Duration: 30 Aug 1988 → 2 Sep 1988 Conference number: 2nd

Conference

Conference	Second European Turbulence Conference
Country/Territory	Germany
City	Berlin
Period	30/08/88 → 2/09/88

Keywords

Prandtl number
Wind tunnel experiment
Passive scalar
Stable stratification
Turbulence parameter

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10.1007/978-3-642-83822-4_30

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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). 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

@inproceedings{e115467ed368429490efdb0569b182bc,

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{\textquoteright}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{\textquoteright}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.",

author = "K. Oduyemi and Britter, {R. E.}",

year = "1989",

doi = "10.1007/978-3-642-83822-4_30",

language = "English",

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pages = "186--191",

editor = "Hans-Hermann Fernholz and Fiedler, {Heinrich E.}",

booktitle = "Advances in turbulence 2",

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note = "Second European Turbulence Conference ; Conference date: 30-08-1988 Through 02-09-1988",

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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 proceeding › Conference contribution

TY - GEN

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.

N1 - Conference code: 2nd

PY - 1989

Y1 - 1989

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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M3 - Conference contribution

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EP - 191

BT - Advances in turbulence 2

A2 - Fernholz, Hans-Hermann

A2 - Fiedler, Heinrich E.

PB - Springer-Verlag

CY - Berlin

T2 - Second European Turbulence Conference

Y2 - 30 August 1988 through 2 September 1988

ER -

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

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

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