Effect of the second inlet location on heat transfer distribution in rotating wedge-shaped channel

When the inlet Reynolds number was fixed at 15 000, the maximum mass flow rate ratio (the ratio between the second inlet mass flow rate and major inlet mass flow rate) was 0.4, and the highest rotation number was 0.23, the heat transfer distribution in a wedge-shaped channel with three different locations of second inlet was investigated by test. The results showed that, under non-rotating condition, heat transfer was improved substantially in the vicinity region of second inlet. Under rotating condition, the upstream region affected by second inlet enlarged, lateral flow extraction slowed down, heat transfer difference between the local leading-wall and trailing-wall reduced, which was minimized when the local heat transfer efficiency reached the maximum. To promote average heat transfer efficiency of channel, and compensate the negative effects induced by rotation, the second inlet injection should be placed in the upper-middle part of channel, and mass flow rate ratio should be controlled below the corresponding critical value.