Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

R. M. Morris
University of Pretoria, Pretoria, South Africa

J. A. Snyman
University of Pretoria, Pretoria, South Africa

Josua Meyer
University of Pretoria

Computational Fluid Dynamics and mathematical optimization were used to investigate the mixing effectiveness of jets in crossflow. A numerical model was developed, validated and calibrated against experimental measurements of a temperature distribution at different cross-sectional planes downstream of an orifice injection plane. Good agreement was obtained when the ratio between momentum and species diffusivities was varied according to the jet-to-mainstream momentum flux ratio. Mathematical optimization of various double-sided jet configurations followed. The results obtained showed that changes in orifice size and spacing at a constant orifice-to-mainstream area ratio and momentum flux ratio have a significant influence on mixing effectiveness. The optimum configuration compared favourably with an empirically defined relationship between orifice spacing and momentum flux ratio. The results showed the feasibility of using a gradient-based approximation method to allow, for a given set of parameters, the systematic adjustment of design variables in order to achieve improvement in performance.

COM-21 pages DOI: 10.1615/IHTC13.p26.200 Download article

Article price - $35.00

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