Heat transfer enhancement and development of correlation for turbulent flow through a tube with triple helical tape inserts
Document Type
Article
Publication Date
1-1-2012
Abstract
Influence of triple helical tapes inserted for turbulent flow through a tube on heat transfer enhancement was studied experimentally. The triple helical tapes made of mild steel with different helix angles, alpha = 9 degrees, 13 degrees, 17 degrees, and 21 degrees were examined for Reynolds number ranging from 22,000 to 51,000. The experiment showed that the Nusselt number, effectiveness and friction factor for the inserts were found to be up to 4.5, 3.45 and 3.0 times, respectively, over the plain tube. The highest enhancement efficiency achieved was 3.7 for the inserts based on constant blower power. Finally, new correlations for predicting heat transfer and friction factor for turbulent flow through a circular tube fitted with the inserts were proposed.
Keywords
Nusselt number, Heat flux, Triple helical tape insert, Enhancement efficiency, Friction factor, Correlation
Divisions
fac_eng
Publication Title
International Communications in Heat and Mass Transfer
Volume
39
Issue
1
Publisher
Elsevier
Additional Information
900AP Times Cited:2 Cited References Count:25