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International Heat Transfer Conference 13

ISBN 印刷: 1-56700-226-9 (CD)
ISBN オンライン: 1-56700-225-0

HEAT FLUX CONTROLLED BOILING IN CONFINED SPACES

DOI: 10.1615/IHTC13.p28.480
page 12




Peter A. Kew
Heriot-Watt University, Department of Mechanical and Chemical Engineering, EH14 4AS Edinburgh, UK

E. Adom
Heriot-Watt University, Edinburgh, Scotland, UK

Keith Cornwell
Department of Mechanical Engineering, Heriot-Watt University, Edinburgh EH14 4AS Scotland, UK

要約

Recent interest in process intensification has resulted in many studies of boiling in confined spaces. Typically, these examine the relationships between heat flux, mass flux and quality similar in form to those widely accepted for use in conventional (>6 mm diameter) channels. As with large tubes, heat flux controlled, convective and dry out regions have been identified during boiling in confined spaces. The heat flux controlled region, often referred to as the apparently nucleate range, as indicated by the heat transfer being independent of quality, tends to be more marked in confined spaces than in conventional channels. In highly compact geometries, growth of confined bubbles controls the fluid flow and distribution at low to intermediate qualities. In this paper, from consideration of the growth of confined bubbles, it is shown that boiling heat transfer mechanisms in confined spaces are such that the mean heat transfer coefficient is a function of the rate of vapour generation, which in turn is directly proportional to the heat flux. Preliminary results from a study of boiling on a compact tube bundle are discussed and it is shown that the heat flux controlled region predominates in such a bundle.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION