On the Gradient Diffusion Hypothesis and Passive Scalar Transport in Turbulent Flows

被引：59

作者：

Combest, Daniel P. ^{[1
]}

Ramachandran, Palghat A. ^{[1
]}

Dudukovic, Milorad P. ^{[1
]}

机构：

[1] Washington Univ, Chem React Engn Lab, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2011年 / 50卷 / 15期

关键词：

QUANTITIES LIKE TEMPERATURE; SCHMIDT NUMBER; PRANDTL; PREDICTION; FLUID; MODEL;

D O I：

10.1021/ie200055s

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A discussion of modeling passive scalar transport in turbulent flows is given. Several methods employed to dose the scalar-flux term < u'phi'> that arises during Reynolds averaging are provided. Alternatives and improvements to the gradient diffusion hypotheses are addressed, most notably, the need for an alternative to the global constant turbulent Schmidt and Prandtl numbers. The reader is given a brief history covering methods used to predict turbulent Schmidt and Prandtl numbers, along with recommendations for future research, based partially on studies by Professor Stuart Churchill. More detailed formulations of turbulent Schmidt or Prandtl numbers will enable better approximations of the influence of turbulence in models of passive scalar flows using the gradient diffusion hypothesis.

引用

页码：8817 / 8823

页数：7

共 36 条

[1]

[Anonymous], 2007, TRANSPORT PHENOMENA

[2]

[Anonymous], 2003, Computational Models for Turbulent Reacting Flows, DOI 10.1017/CBO9780511610103

[3]

[Anonymous], 1997, Computational Fluid Mechanics and Heat Transfer

[4]

*ANS INC, 2006, ANS FLUENT 6 3 US GU