Experimental Investigation into Heat Transfer during Swirl Jet Impingement

摘要

Augmentation of heat transfer during jet impingement has always been point of interest. For this numerous was are employed of which one way is increasing the turbulence of impinging jet. This can be achieved by using swirl generators. In Author's previous work, numerical simulations were executed to study the effect of heat transfer during Multi-Swirl Jet Impingement (MSJI). In the current work, experimental investigations for evaluating heat transfer during the same are presented. The ducts for this purpose are 3D Printed using PLA. The ducts contain helical swirl generators for generating swirls in impinging jets. 3 different helical swirl generators are experimented. During experimentation, 3×3 swirl jets are impinged on a flat plate. Smoke tests were executed to study the flow pattern. The flow pattern is in agreement with that of simulation results. These are discussed in the article. When experimenting for measuring heat transfer coefficient, Constant heat flux is given as input for which TEC is used. Constant heat flux is a situation that occurs during electronics cooling. Temperatures are measured using 100K Thermistors. These are interfaced to PC using Intel Edison development board. The schematics of the test rig are presented in the paper. Experimentally determined heat transfer coefficient is compared with that of numerically computed value. This is being done so as to validate the authors work published previously.