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Abstract
A numerical study is reported on the flow and heat transfer in a channel with two right-angle bends. The Reynolds-stress turbulence closure model is introduced for the computation of the flow field. The solution method of the governing transport equations is based on the finite volume method which incorporates the modified hybrid scheme. The computations are made for step ratios H/W = 1–4 and for Reynolds numbers Re = 3000–10,000. The complex patterns of the Reynolds stresses in the perpendicularly corrugated wall channel are analyzed and the mechanisms of heat transfer are explained with regard to the mean flow motions. The computed Nusselt numbers are compared with both experimental data in the literature and the computations which were obtained by using the κ-ϵ model.