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Experimental investigation of heat transfer and friction characteristics in a circular tube fitted with V-nozzle turbulators
Author(s)
Eiamsa-ard, S.
Date Issued
May 1, 2006
Type
Article
Abstract
The effects of V-nozzle inserts on heat transfer and friction characteristics in a uniform heat flux tube are experimentally studied. Three different pitch ratios (PR) of V-nozzle arrangements in the test tube are introduced with PR = 2.0, 4.0, and 7.0, in each run. The results of experimental investigations of heat transfer, friction characteristic and enhancement efficiency are presented. It is found that using the V-nozzle can help to increase considerably the heat transfer rate at about 270% over the plain tube. A maximum gain of 1.19 on enhancement efficiency is obtained for the smallest pitch ratio used, PR = 2.0. This indicates that the effect of the reverse/re-circulation flows can improve the heat transfer rate in the tube. In addition, correlations from the results are presented. © 2006 Elsevier Ltd. All rights reserved.
Citation
International Communications in Heat and Mass Transfer, 33(5), 591-600, 2006