Abstract: To better understand the effect of rotation on the heat transfer characteristics of internal channels, the flow and heat transfer in an internal channel with 90° ribs are investigated using three-dimensional numerical simulation method. The Reynolds number of channel inlet is 17 000, and the mass flow rates of three outlets are 25%, 50%, and 25%, respectively. The rotating number and the hydraulic diameter divided by radius of gyration range from 0 to 0.09 and 0 to 69.6, respectively. The influences of rotation number and radius of gyration on heat transfer coefficient are achieved. Results show that the pressure coefficient increases along radial outflow and decreases along radial inflow due to rotational force. In the trailing surface, Nusselt number (Nu) in radial outflow passages increases and Nu number in radial inflow passage decreases with the augment of the rotation number. The variation of Nu in the leading surface is contrary to that of the trailing surface. The Nu numbers along the flow direction in trailing and leading surfaces are slightly enhanced when the ratio of gyration radius to hydraulic diameter increases. The surface heat transfer coefficient is affected by the variable radius of gyration.

Key words: basic disciplines of aerospace and technology, ribbed channel, rotating, convective heat transfer, numerical simulation, pressure coefficient