Annals of the Assembly for International Heat Transfer Conference 13
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ARTICLE:
R. M. Morris J. A. Snyman Josua Meyer ABSTRACT 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 |
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