摘要
The heat transfer and flow characteristics of air jet impingement on a curved surface are investigated with computational fluid dynamics(CFD)approach.The first applied model is a one-equation SGS model for large eddy simulation(LES)and the second one is the SST-SAS hybrid RANS-LES.These models are utilized to study the flow physics in impinging process on a curved surface for different jet-to-surface(h/B)distances at two Reynolds numbers namely,2960 and 4740 based on the jet exit velocity(U_e)and the hydraulic diameter(2B).The predictions are compared with the experimental data in the literature and also the results from RANS k-εmodel.Comparisons show that both models can produce relatively good results.However,one-equation model(OEM)produced more accurate results especially at impingement region at lower jet-to-surface distances.In terms of heat transfer,the OEM also predicted better at different jet-to-surface spacings.It is also observed that both models show similar performance at higher h/B ratios.
The heat transfer and flow characteristics of air jet impingement on a curved surface are investigated with com- putational fluid dynamics （CFD） approach. The first applied model is a one-equation SGS model for large eddy simulation （LES） and the second one is the SST-SAS hybrid RANS-LES, These models are utilized to study the flow physics in impinging process on a curved surface for different jet-to-surface （h/B） distances at two Reynolds numbers namely, 2960 and 4740 based on the jet exit velocity （Ue） and the hydraulic diameter （2B）, The predic- tions are compared with the experimental data in the literature and also the results from RANS k-ε model. Com- parisons show that both models can produce relatively good results. However, one-equation model （OEM） produced more accurate results especially at impingement region at lower jet-to-surface distances. In terms of heat transfer, the OEM also predicted better at different jet-to-surface spacings. It is also observed that both models show similar performance at higher h/B ratios.
