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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

INFLUENCE OF THE SURFACE STRUCTURE ON POOL BOILING HEAT TRANSFER

page 12
DOI: 10.1615/IHTC13.p28.270
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The surface structure, heat transfer and active nucleation sites on horizontal copper tubes are investigated. The surface of the tubes of varying diameter is fine sandblasted resulting in a stochastic microstructure. The surfaces are measured by a three-dimensional contactless stylus instrument combining the stylus technique with the near field acoustic microscopy. The method opens the possibility to obtain results according to standard for practical belongings on the one side and to get detailed information about the three-dimensional shape of each cavity within the surface investigated on the other side. The heat transfer measurements are carried out with R134a, propane and 2-propanol in wide ranges of pressure and heat flux within the standard apparatus. The bubble formation is observed by high speed video technique. The active nucleation sites are localized and are combined with the potential nucleation sites by means of statistical methods. The differences between simultaneously activated nucleation sites are manifold. The heat transfer coefficients for the three fluids are nearly the same although the bubble formation is totally different.

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