Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Theoretical an experimental study of nucleate pool boiling heat transfer on copper hydrophobicity surface

Authors
Seyed Sina Arshadi 1
Hamid Saffari 2
Amir Mirzagheytani 3
1 Msc., Department of Mechanical Engineering, Iran University of Science and Technology
2 Associate professor, Department of Mechanical Engineering, Iran University of Science and Technology
3 PhD. Stu., Department of Mechanical Engineering, Iran University of Science and Technology
Abstract
In this paper, the effects of surface hydrophilicity on nucleate pool boiling of water under atmospheric pressure were theoretically modeled and experimentally examined. The proposed analytical model consider change of contact angle in bubble growing period Comparisons of the pool boiling curve based on the modified model with existing experimental data and previous model show the better agreement. Moreover, hydrophilic surfaces (with contact angles of 34, 22, ˂10) are made by immersing the copper in an aqueous solution of sodium hydroxide and potassium persulphate for different length of times (30, 60, 180 min, respectively) and the boiling experiment on these surfaces is compared with prediction of model. According to experimental results, the surface treating method applied in this research is an effective means to promote the surface wettability of a copper, and the more hydrophilicity of treated surfaces tend to yield a greater pool boiling heat transfer coefficient than the untreated surface.
Keywords
Nucleate pool boiling
Surface hydrophilicity
Dynamic contact angle

Subjects

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Iranian Journal of Mechanical Engineering Transactions of ISME
Volume 17, Issue 4 - Serial Number 41
Heat Transfer and Fluid Mechanics
Winter 2016
Pages 85-104

  • Receive Date 08 June 2015
  • Revise Date 19 September 2015
  • Accept Date 20 October 2015