Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 32, Issue 3, Pages 761-775Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2007.09.006
Keywords
experimental; friction; heat transfer; helically-finned tube
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Heat transfer coefficients and friction factors were determined experimentally for eight helically-finned tubes and one smooth tube using liquid water at Reynolds numbers ranging from 12,000 to 60,000. The helically-finned tubes tested in this investigation have helix angles between 25 degrees and 48 degrees, number of fin starts between 10 and 45, and fin height-to-diameter ratios between 0.0199 and 0.0327. An uncertainty analysis was completed and plain-tube results were compared to the Blasius and Dittus-Boelter equations with satisfactory agreement. Power-law correlations for Fanning friction and Colburn j-factors were developed using a least-squares regression. The performance of the correlations was evaluated with data of other researchers with average prediction errors between 30% and 40%. Published by Elsevier Inc.
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