Abstract
The purpose of the present study is to clarify the heat transfer
characteristics with multiple jet impingement aiming at the highly
efficient cooling performance. In the study, we investigated the
effect of injection parameters on circular jet array impingement
heat transfer. As we focus on interference among the adjacent
impinging jets, tests are mainly conducted at the minimum
crossflow condition. The experiments are also conducted at
injection distance from 2 to 8 jet hole diameters and jet-to-jet
spacing from 4 to 8 jet hole diameters. Jet hole diameter Reynolds
number is 4,680. Thermochromic liquid crystal is used to obtain
heat transfer coefficient. Wall pressure measurement and oil flow
visualization on the target surface are performed to understand the
flow pattern of impinging jet and wall jet. The effect of injection
parameters, such as injection distance, jet-to-jet spacing and
number of jets, on jet array impingement heat transfer is clarified.
