Flow and Mixing Pattern of Transverse Turbulent Jet in Venturi-Jet Mixer

In this paper, computational simulations of three dimensional flow mixing process of turbulent jet with crossflow in a venturi-jet mixer using a standard Computational Fluid Dynamics solver is presented. In addition to the prediction of velocity and pressure fields, the turbulent intensity, concentration decay and mixture parameter using tracer (suction fluid) spatial distributions in the downstream distances from the jet injection point are obtained numerically to deduce certain design information related to the orientation and position of the jet in the mixer. The jet injection angle (θo) is varied from 45° to 135° and Reynolds number (Re) is set in the range of 32,000–51,000. A jet centreline trajectory is traced based on maximum concentration values of tracer along the flow field for the theoretical cases and compared with previously published trajectory correlation of the author. A reasonable agreement was indicated between both traces. Also a comparison of numerical results and measured data for flow mixing process in the venturi-jet mixer is made to check the results of numerical simulations.