Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
658445 | International Journal of Heat and Mass Transfer | 2013 | 8 Pages |
Abstract
This work reports detailed impingement heat transfer measurements on grooved surfaces using transient liquid crystal method. These grooves are machined on the target surfaces with either parallel or orthogonal to the exit flow direction, and are aligned either with the jet holes (inline pattern) or between the jet holes (staggered pattern). The jet-to-target plate spacing (Z/d) is 3 and the average jet Reynolds numbers are from 2500 to 7700. Results show that heat transfer is enhanced near grooves. However, the grooves underneath the jet holes hinder the impingement flow and the jet impingement heat transfer is reduced. Although local heat transfer shows distinct distributions, there is no significant difference in overall-averaged Nusselt numbers on the grooved surfaces and the highest heat transfer enhancement by grooved surfaces is 15%.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Yao-Hsien Liu, Siao-Jhe Song, Yuan-Hsiang Lo,