ON THE SKEWNESS OF THE TEMPERATURE DERIVATIVE IN TURBULENT FLOWS.

K. R. Sreenivasan, S. Tavoularis

Research output: Contribution to journalArticle

Abstract

The paper provides some explanation of the fact that, contrary to the requirements of local isotropy, the skewness S of the streamwise temperature derivative has been observed to be a non-zero constant of magnitude of about unity in high-Reynolds-number and high-Peclet-number turbulent shear flows. Measurements in slightly heated homogeneous shear flows and in unsheared grid turbulence suggest that S is non-zero only when the mean shear and the mean temperature gradient are both non-zero. The form of S is given for the cases of fixed mean shear and of fixed mean temperature gradient. Predictions from a simplified transport equation for the streamwise temperature derivative, derived in the light of the present experimental observations, are in reasonable agreement with the measured values of S. A possible physical mechanism maintaining S is discussed. Refs.

Original languageEnglish (US)
Pages (from-to)783-795
Number of pages13
JournalJournal of Fluid Mechanics
Volume101
Issue numberpt 4
StatePublished - Jan 1 1980

Fingerprint

skewness
Shear flow
turbulent flow
Thermal gradients
Turbulent flow
Derivatives
Peclet number
shear flow
temperature gradients
Reynolds number
Turbulence
shear
Temperature
temperature
high Reynolds number
isotropy
unity
turbulence
grids
requirements

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

ON THE SKEWNESS OF THE TEMPERATURE DERIVATIVE IN TURBULENT FLOWS. / Sreenivasan, K. R.; Tavoularis, S.

In: Journal of Fluid Mechanics, Vol. 101, No. pt 4, 01.01.1980, p. 783-795.

Research output: Contribution to journalArticle

@article{2c5648edde074924bd71e592591bda8d,
title = "ON THE SKEWNESS OF THE TEMPERATURE DERIVATIVE IN TURBULENT FLOWS.",
abstract = "The paper provides some explanation of the fact that, contrary to the requirements of local isotropy, the skewness S of the streamwise temperature derivative has been observed to be a non-zero constant of magnitude of about unity in high-Reynolds-number and high-Peclet-number turbulent shear flows. Measurements in slightly heated homogeneous shear flows and in unsheared grid turbulence suggest that S is non-zero only when the mean shear and the mean temperature gradient are both non-zero. The form of S is given for the cases of fixed mean shear and of fixed mean temperature gradient. Predictions from a simplified transport equation for the streamwise temperature derivative, derived in the light of the present experimental observations, are in reasonable agreement with the measured values of S. A possible physical mechanism maintaining S is discussed. Refs.",
author = "Sreenivasan, {K. R.} and S. Tavoularis",
year = "1980",
month = "1",
day = "1",
language = "English (US)",
volume = "101",
pages = "783--795",
journal = "Journal of Fluid Mechanics",
issn = "0022-1120",
publisher = "Cambridge University Press",
number = "pt 4",

}

TY - JOUR

T1 - ON THE SKEWNESS OF THE TEMPERATURE DERIVATIVE IN TURBULENT FLOWS.

AU - Sreenivasan, K. R.

AU - Tavoularis, S.

PY - 1980/1/1

Y1 - 1980/1/1

N2 - The paper provides some explanation of the fact that, contrary to the requirements of local isotropy, the skewness S of the streamwise temperature derivative has been observed to be a non-zero constant of magnitude of about unity in high-Reynolds-number and high-Peclet-number turbulent shear flows. Measurements in slightly heated homogeneous shear flows and in unsheared grid turbulence suggest that S is non-zero only when the mean shear and the mean temperature gradient are both non-zero. The form of S is given for the cases of fixed mean shear and of fixed mean temperature gradient. Predictions from a simplified transport equation for the streamwise temperature derivative, derived in the light of the present experimental observations, are in reasonable agreement with the measured values of S. A possible physical mechanism maintaining S is discussed. Refs.

AB - The paper provides some explanation of the fact that, contrary to the requirements of local isotropy, the skewness S of the streamwise temperature derivative has been observed to be a non-zero constant of magnitude of about unity in high-Reynolds-number and high-Peclet-number turbulent shear flows. Measurements in slightly heated homogeneous shear flows and in unsheared grid turbulence suggest that S is non-zero only when the mean shear and the mean temperature gradient are both non-zero. The form of S is given for the cases of fixed mean shear and of fixed mean temperature gradient. Predictions from a simplified transport equation for the streamwise temperature derivative, derived in the light of the present experimental observations, are in reasonable agreement with the measured values of S. A possible physical mechanism maintaining S is discussed. Refs.

UR - http://www.scopus.com/inward/record.url?scp=0019287021&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0019287021&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0019287021

VL - 101

SP - 783

EP - 795

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

IS - pt 4

ER -