Table of Contents
Journal of Fluids
Volume 2014, Article ID 873684, 11 pages
http://dx.doi.org/10.1155/2014/873684
Research Article

Enhancement of Impinging Jet Heat Transfer Using Two Parallel Confining Plates Mounted near Rectangular Nozzle Exit

1Nagano National College of Technology, Nagano 381-8550, Japan
2Shinshu University, Nagano 380-8553, Japan

Received 1 October 2013; Accepted 16 January 2014; Published 25 March 2014

Academic Editor: Toshiyuki Gotoh

Copyright © 2014 Yoshiaki Haneda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Impinging jet heat transfer on a target plate was enhanced by using two parallel confining plates mounted between a rectangular nozzle end plate and a jet target plate. The target plate was set equal to 2, 3, 4, and 5 times the jet exit width, , and the gap ratio of two parallel confining plates, , were changed from 2.7 to 8.0 only by impinging length and from 2.7 to 6.7 by . Two confining parallel plates mounted near the jet exit produced swing-type flow under some conditions. As a result, the maximum Nusselt number attained around the stagnation point was augmented by about 50% compared to the one for normal impinging jet without the two parallel plates and then spatial mean Nusselt number was increased by about 40%.