Forced Convective Heat Transfer of MWCNT/Water Nanofluid Under Constant Heat Flux: An Experimental Investigation

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• 作者：Munish Gupta ; Rajesh Kumar ; Neeti Arora…
• 关键词：Nanofluids ; Laminar flow ; Heat transfer enhancement ; Constant heat flux
• 刊名：Arabian Journal for Science and Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：41
• 期：2
• 页码：599-609
• 全文大小：1,199 KB
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• 作者单位：Munish Gupta (1)
  Rajesh Kumar (1)
  Neeti Arora (1)
  Sandeep Kumar (2)
  Neeraj Dilbagi (2)
  
  1. Department of Mechanical Engineering, Guru Jambheshwar University of Science and Technology, Hisar, 125001, Haryana, India
  2. Department of Bio and Nano Technology, Guru Jambheshwar University of Science and Technology, Hisar, 125001, Haryana, India
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Mathematics
  Science, general
  
• 出版者：Springer Berlin / Heidelberg

文摘

This research article investigates the effect of multi-walled carbon nanotubes (MWCNT)/water nanofluid on convective heat transfer in a uniformly heated copper tube under laminar flow regime. The MWCNT were synthesized using chemical vapor deposition method and characterized using transmission electron microscope. These nanoparticles were dispersed (with 0.05, 0.1, 0.3 and 0.5 % weight concentrations) in distilled water to form stable suspensions of nanofluids. The heat transfer coefficients (HTC) of nanofluids and distilled water (base fluid) were evaluated and compared using constant velocity basis. The thermophysical properties of nanofluids change with the addition of nanoparticles; thus, we have considered the constant velocity criteria which provide the true comparison in contrast to constant Reynolds number used by earlier researchers. The effect of flow velocity (0.166–0.232 m/s) and nanoparticles weight concentration on the HTC considering constant heat flux boundary conditions was studied. It is observed that with the increase in the weight concentration of nanoparticles or flow velocity, the HTC increases. Nanofluids show higher HTC with respect to distilled water at all the concentrations of nanoparticles. At 0.5 wt.% weight concentration and flow velocity of 0.232 m/s, the maximum HTC obtained is 77.60 % in comparison with distilled water. Keywords Nanofluids Laminar flow Heat transfer enhancement Constant heat flux