Heat transfer performance in a rotating two-inlet cooling wedge-shaped channel with lateral inflow holes

A two-inlet internal cooling wedge-shaped channel was used to perform the heat transfer study. Four circular holes, drilled on the wide side of high-radius region, are used to provide the lateral coolant inflow. The coolant mass flow rate ratio (MR, lateral-to-total) is applied for the interaction between bottom inlet coolant and lateral inlet coolant, and varies from 0 to 1.0. The major inlet Reynolds number and rotation number are varied from 10,000 to 20,000 and 0 to 1.1, respectively. Because only one wall-temperature ratio was performed in current study, the isolated buoyancy effect was not able to be disclosed while the main focus was the MR effect of present rotating channel. The results show that single lateral coolant inflow significantly improves heat transfer of channel top-half at stationary, but brings positive enhanced effect on bottom-half regions in rotating cases. When MR increases over 0.5, the lateral coolant begins to present positive effect on channel bottom-half. A critical MR of 0.3 is observed at top-half regions for the least stream-wise heat transfer difference. For both heat transfer enhancement and uniformity consideration, the MRs from 0.3 to 0.7 are better considered for two-inlet cooling schemes, while the optimal condition is around 0.45. Two-inlet cooling scheme monotonously improves rotational surface averaged heat transfer as MR increases. Due to the rotational effects and MR effects on high-radius regions are very limited, the trends of surface averaged values are mainly determined by low-radius region.