Some problems of second order modelling of mass transfer in a turbulent gas mixture
Abstract
Some of the problems encountered in the investigation of density effects in a turbulent flow are studied theoretically and experimentally, with attention focused exclusively on the mixing of two nonreactive gases in a free subsonic round jet. The theoretical part involves the secondorder modeling of such a flow with the use of massweighted averages; a model with eight transport equations is proposed. The experimental part consists in the measurement of mean velocity and concentration, and four significant Reynolds stresses in 21 sections of a CO2air jet issuing from a long pipe at Reynolds number of 54,100. A direct comparison between numerical predictions and experimental data makes it possible to assess a model based on rather crude extensions of schemes previously developed for buoyant flows. In addition, difficulties of turbulence modeling for a variable density flow are evaluated in an attempt to identify the critical aspects that require improvement.
 Publication:

Structure of turbulence in heat and mass transfer
 Pub Date:
 1982
 Bibcode:
 1982sthm.book..509C
 Keywords:

 Computational Fluid Dynamics;
 Free Jets;
 Gas Mixtures;
 Mass Transfer;
 Turbulent Flow;
 Air Jets;
 Gas Density;
 Mathematical Models;
 Turbulent Jets;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer