Advances in nano research

  • 제2권2호
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  • Pages.99-109
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  • 2014
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  • 2287-237X(pISSN)
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  • 2287-2388(eISSN)
테크노프레스 (Techno-Press)
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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)
  • 투고 : 2013.03.07
  • 심사 : 2014.05.12
  • 발행 : 2014.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

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피인용 문헌

  1. Pressure Drop and Heat Transfer Characteristics of MWCNT/Heat Transfer Oil Nanofluid Flow inside Microfinned Helical Tubes with Constant Wall Temperature vol.622-623, pp.1662-8985, 2012, https://doi.org/10.4028/www.scientific.net/AMR.622-623.796
  2. Effect of high energy ball milling on the structure of iron - multiwall carbon nanotubes (MWCNT) composite vol.6, pp.3, 2017, https://doi.org/10.12989/amr.2017.6.3.245