NUMERICAL FLOW AND HEAT TRANSFER UNDER IMPINGING JETS: A REVIEW
Numerical studies related to the prediction of transport processes under laminar and turbulent jets impinging on flat surfaces are reviewed in light of the experimental data available under a limited range of the relevant parameters. Brief summaries are presented of the numerical techniques commonly employed and the turbulence models used to obtain results of engineering interest. Effects of various flow and geometric parameters on the flow, heat/mass transfer in the impingement and wall jet zones of single/multiple, round/slot jets impinging normally/obliquely on a stationary/moving surface which may be permeable or impermeable are discussed. Deficiencies in current numerical models are identified via comparison with relevant experimental data. It is concluded that the two-equation and algebraic stress models, which allow the integration of the variables up to the wall, provide the best hope for engineering calculations for the turbulent impinging jets in the near future. Prediction of the flow, heat and mass transfer under a single, semi-confined turbulent jet may be employed as a good test for new turbulence models.
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