ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
MODELING OF MASS TRANSPORT IN TURBULENT SHEAR FLOWS
Abstract
An alternative method to calculate mass/
scalar transport in simple turbulent shear flows
is presented. The method is based on the solution
of the transport equation for the joint probability
density function (pdf) of the species. It is
solved by partitioning the equation into a "fluid
mechanical" and a "mixing" part. A simple
model is proposed for the transport of the pdf,
while a Monte Carlo method is used to simulate
"mixing" of the species and hence, further
modified the pdf. The calculations give the probability
distributions of the species directly.
Therefore, the statistics of the species' fluctuations
can be determined. Results of the first
four moments of the pdf are in good agreement with
measurements of mass transport in non-reactive
turbulent shear flows with variable density. Good
agreement is also obtained with turbulent
diffusion flame measurements assuming chemical
equilibrium.