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Thermal performance of closed two-phase thermosiphon using nanofluids.

Author(s) : KHANDEKAR S., JOSHI Y. M., MEHTA B.

Type of article: Article

Summary

Nanofluids, stabilized suspensions of nanoparticles typically <100 nm in conventional fluids, are evolving as potential enhanced heat transfer fluids due to their improved thermal conductivity, increase in single phase heat transfer coefficient and significant increase in critical boiling heat flux. In this paper, the authors investigate the overall thermal resistance of closed two-phase thermosiphon using pure water and various water based nanofluids (of Al2O3, CuO and laponite clay) as working fluids. They observe that all these nanofluids show inferior thermal performance than pure water. Furthermore, they observe that the wettability of all nanofluids on copper substrate, having the same average roughness as that of the thermosiphon container pipe, is better than that of pure water. A scaling analysis is presented which shows that the increase in wettability and entrapment of nanoparticles in the grooves of the surface roughness cause decrease in evaporator side Peclet number that finally leads to poor thermal performance. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Thermal performance of closed two-phase thermosiphon using nanofluids.
  • Record ID : 2008-1572
  • Languages: English
  • Source: International Journal of thermal Sciences - vol. 47 - n. 6
  • Publication date: 2008/06

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