### 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 language | English (US) |
---|---|

Pages (from-to) | 783-795 |

Number of pages | 13 |

Journal | Journal of Fluid Mechanics |

Volume | 101 |

Issue number | pt 4 |

State | Published - Jan 1 1980 |

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### ASJC Scopus subject areas

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

### Cite this

*Journal of Fluid Mechanics*,

*101*(pt 4), 783-795.

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

Research output: Contribution to journal › Article

*Journal of Fluid Mechanics*, vol. 101, no. pt 4, pp. 783-795.

}

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 -