The characteristics of heat transfer and flow in a rectangular channel with bottom of scale groove were investigated with numerical method. The numerical calculation was performed with large eddy simulation. A variety of small scale V-shapes groove with different of depth and space in longitudinal were employed in numerical simulation. The coherent structure near the surface of small scale groove was studied. The effect of the depth and space in longitudinal of small scale groove on coherent structure was investigated. Furthermore, the relationship between coherent structure and local heat transfer coefficient was investigated as well as. The numerical results indicate that the heat transfer performance of channel with small scale groove has been improved and the drag reduction has been gained in some case. The numerical simulation indicated that flow structure in different area of small scale groove had obvious difference and it would cause influence on local heat transfer coefficient.

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