FLOW AND HEAT-TRANSFER IN ROUND VERTICAL BUOYANT JETS

The application of the algebraic stress modeling method (ASM) for calc ulating the flow in a turbulent vertical round jet is described. The A SM method yields algebraic equations for Reynolds stresses [u'(i)u'j] and turbulent heat flux components [u'(i)T']. Transport equations are solved for the turbulent kinetic energy k, its dissipation rate epsilo n and mean square of temperature fluctuations [T'2]. A new version of the model has been used allowing one to account for the effect of norm al Reynolds stresses on energy redistribution in the spectrum of turbu lent fluctuations. To model these effects, an additional term has been included into the equation for epsilon. A new effective approach to s olving the governing system of partial differential equations is sugge sted based on the introduction of mathematical variables. Examples of numerical calculations are presented which are compared with the avail able experimental data of other authors. It has been found that they a gree satisfactorily with the results of measurements.