Numerical study on the effects of using internal star fins on heat transfer from pipes
Publish place: سومین کنفرانس انتقال حرارت و جرم ایران
Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICHMT03_010
تاریخ نمایه سازی: 7 اسفند 1396
Abstract:
The paper presents a three dimensional numerical simulation to predict heat transfer and pressure drop of turbulent fluid flow inside internally star finned tubes.The effects of Reynolds number (Re = 5000-30000), finnumbers (n=5, 10), and fin geometry (wavy and smooth) on Nusselt number (Nu), friction factor (f) and thermal performance factor ( ) are investigated under uniform wall heat flux condition. The obtained results reveal that both heat transfer rate and friction factor of star finned tubes are significantly higher than those of plain tube. Maximum values of Nu and f for case with wavy star fins are 510% and 779% higher than those for plain tube, also maximum obtained value of is 2.96.
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Authors
f Khanmohammadi
M.sc Student of Mechanical Engineering, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology;
m Farhadi
Professor of Mechanical Engineering, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology
a.a Rabienataj. Darzi
Assistant Professor of Mechanical Engineering, Faculty of Mechanical Engineering, University of Mazandaran;