Lateral velocity fluctuations and dissipation time scale ratios for prediction of mean and fluctuating temperature fields

Gehrke P.J. and Bremhorst K. (1993) Lateral velocity fluctuations and dissipation time scale ratios for prediction of mean and fluctuating temperature fields. International Journal of Heat and Mass Transfer, 36 7: 1943-1952. doi:10.1016/S0017-9310(05)80181-4


Author Gehrke P.J.
Bremhorst K.
Title Lateral velocity fluctuations and dissipation time scale ratios for prediction of mean and fluctuating temperature fields
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/S0017-9310(05)80181-4
Volume 36
Issue 7
Start page 1943
End page 1952
Total pages 10
Subject 1507 Transportation and Freight Services
2100 Energy
2210 Mechanical Engineering
Abstract Further testing of a previously developed diffusivity-based model for predicting mean and fluctuating temperatures in water and liquid sodium flows downstream of a multi-bore jet block in which one jet is heated is performed but using air as the working fluid. The apparatus used enabled geometric similitude with the previous studies. The previous model used longitudinal turbulence intensities and longitudinal integral length scales to estimate values of the eddy diffusivity of heat. Measurement of lateral velocities in the present work allowed a significant improvement to be made in the modelling procedure. It was found that the lateral turbulence intensity was a more effective velocity scale to use and a length scale based on lateral velocity fluctuations was more apt. The Prandtl number effect on temperature dissipation rates found previously in water and sodium is extended by the results using air, leading to a simple algebraic relation between the Prandtl number and dissipation time scale ratio. The non-isotropic nature of the flow is identified and is seen to influence the results.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 14 Jun 2016, 11:02:35 EST by System User