Heat transfer in a radially rotating four-pass serpentine channel with staggered half-V rib turbulators

The present work is concerned with experimental investigation of the convec tive heat transfer in a radially rotating four-pass serpentine channel. Two types of staggered half-V rib turbulators are considered to examine their effects on heat transfer enhancement. The coolant air is pressurized and pr e-cooled to compensate for the low rotating rare and low temperature or den sity difference in key parameters of thermal and flow characteristics. The geometric dimensions are fixed whereas the ranges bf the thermal and flow p arameters in the present measurements are 20,000 less than or equal to Re l ess than or equal to 40,000, 0 less than or equal to Ro less than or equal to0.21, and Gr/Re-2 similar to O (10(-2)). The present results disclose the effects of the pressurized flow, rib arrangement, channel rotation, and ce ntrifugal buoyancy on the local heat transfer in each passage of the channe l. Finally, the present data are fitted on correlation equations for evalua tion of local heat transfer in the rotating four-pass ribbed channel config urations considered.