期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 92, 期 -, 页码 792-806出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2015.09.039
关键词
Turbulent Prandtl number; Reynolds analogy; Mixed convection; Supercritical pressure; Strong property variation
资金
- Nuclear Research & Development Program of the National Research Foundation of Korea (NRF) grant - Korean government (MSIP) [NRF-2012M2A8A2025682]
- National Research Foundation of Korea [2012M2A8A2025682] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
When a fluid at supercritical pressure approaches the pseudo-critical temperature it experiences a strong variation in physical properties putting applicability of various turbulent flow modelings in question. Earlier numerical calculations showed, without exception, unrealistic over-predictions, as soon as the fluid temperature approached the pseudo-critical temperature. The over-predictions might have been resulted either from an inapplicability of widely used turbulence models or from an unrealistic treatment of the turbulent Prandtl number (Pr-t) as a constant. Recent research, both numerical and experimental, indicates that Pr-t is very likely a function of fluid-thermal variables as well as physical properties, when the gradients of physical properties of a fluid are significant. This paper describes the procedure fora new formulation of Pr-t which varies with physical properties and fluid-thermal variables. The application of the variable Pr-t was surprisingly successful in reproducing the fluid temperature in supercritical fluids flowing in small-diameter vertical tubes ranging from 4.57 to 20 mm. (C) 2015 Elsevier Ltd. All rights reserved.
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