Heat transfer of a rotating two-inlet trailing edge channel with lateral fluid extractions

An experimental investigation of heat transfer in a radially rotating wedge-shaped channel with two inlets and lateral fluid extractions was conducted. The lateral inlet, comprising eight circular holes uniformly distributed on the wide sidewall, is for a second coolant besides the usual bottom inflow. The mass flow rate ratio (MR, lateral-to-total) is varied from 0 to 1.0 in current study to indicate the strength of the two streams. The major Reynolds number ranges from 10,000 to 20,000, and the highest rotation number is 1.1 in present work. In the current fashion of experiments, the effects of rotation number and buoyancy number could not be decoupled since the temperature ratio is controlled at around 0.14 in all the cases. Therefore, the authors would like to caution the audiences that there are uncontrollable buoyancy magnitude in the studies of the effects of rotation number. Compared with pure bottom inlet, higher heat transfer coefficients and better uniformity are observed with single lateral inlet. With both inlets, the increase of MR enhances the heat transfer rates over the top-half regions at the expense of weakening the bottom-half counterparts; while the least heat transfer difference is obtained when MR reaches 0.55. The averaged regional/surface heat transfer variations induced by rotation are no more than 6% when MR exceeds 0.5. It is recommended that more coolant should be supplied to the lateral inlet due to higher heat transfer levels with lower heat transfer variations. Meanwhile, comparison with our previous works is performed both at static states and rotation states and some meaningful results are obtained.