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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

FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION

page 11
DOI: 10.1615/IHTC13.p28.30
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ABSTRACT

Flow boiling experiments with mixtures of poly dimethyl siloxanes and n-pentane are carried out in a vertical annular channel. The mixtures are fed to the test section with a subcooling of 30 − 65 K. The flow condition at the inlet can be characterized as creeping flow with Re-numbers as small as 0.01. Strong radial temperature gradients prevail throughout the entire evaporation process, indicating a laminar flow character even under boiling conditions.
Analysing the experiments, heat transfer to a homogeneous liquid phase, subcooled boiling, fully developed nucleate boiling, convective heat transfer to a two-phase flow and flash effects due to pressure loss can be distinguished.
Yet heat transfer can be described as a first approximation by a simple model which is based on laminar single phase heat transfer and incorporates an additional convective term reflecting the augmentation of convection through the gas phase.

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