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http://dx.doi.org/10.12989/anr.2014.2.2.099

Convective heat transfer of MWCNT / HT-B Oil nanofluid inside micro-fin helical tubes under uniform wall temperature condition  

Kazemia, M.H. (School of Mechanical Engineering, College of Engineering, University of Tehran)
Akhavan-Behabadi, M.A. (School of Mechanical Engineering, College of Engineering, University of Tehran)
Nasr, M. (School of Mechanical Engineering, College of Engineering, University of Tehran)
Publication Information
Advances in nano research / v.2, no.2, 2014 , pp. 99-109 More about this Journal
Abstract
Experiments are performed to investigate the single-phase flow heat transfer augmentation of MWCNT/HT-B Oil in both smooth and micro-fin helical tubes with constant wall temperature. The tests in laminar regime were carried out in helical tubes with three curvature ratios of 2R/d=22.1, 26.3 and 30.4. Flow Reynolds number varied from 170 to 1800 resulting in laminar flow regime. The effect of some parameters such as the nanoparticles concentration, the dimensionless curvature radius (2R/d) and the Reynolds number on heat transfer was investigated for the laminar flow regime. The weight fraction of nanoparticles in base fluid was less than 0.4%. Within the applied range of Reynolds number, results indicated that for smooth helical tube the addition of nanoparticles to the base fluid enhanced heat transfer remarkably. However, compared to the smooth helical tube, the average heat transfer augmentation ratio for finned tube was small and about 17%. Also, by increasing the weight fraction of nanoparticles in micro-fin helical tubes, no substantial changes were observed in the rate of heat transfer enhancement.
Keywords
convective heat transfer; nanofluid; helical tube; micro-fin tube; enhancement;
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