Numerical study on the effects of using internal star fins on heat transfer from pipes

سال انتشار: 1396
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 374

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شناسه ملی سند علمی:

ICHMT03_010

تاریخ نمایه سازی: 7 اسفند 1396

چکیده مقاله:

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.

کلیدواژه ها:

Internally star finned tube ، pressure drop ، thermal performance

نویسندگان

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;