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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/3211

Title: A comparison with the three-zone model for flow boiling heat transfer in small diameter tubes
Authors: Shiferaw, D
Karayiannis, TG
Kenning, DBR
Keywords: Flow boiling
Flow pattern
Heat transfer
Two-phase flow
Elongated bubble
Small diameter
Publication Date: 2006
Publisher: International Scientific Committee
Citation: 13th International Heat Transfer Conference, Sydney, Australia, 13-18 August 2006
Abstract: Flow boiling heat transfer experimental results, obtained in two stainless steel tubes of internal diameter 4.26 mm and 2.01 mm using R134a as the working fluid, indicate that the local heat transfer coefficient increases with heat flux and is independent of vapour quality when this is less than about 40% to 50% for the 4.26 mm tube and 20% to 30% for the 2.01 mm tube, conventionally interpreted as nucleate boiling. Above these quality values, the separate graphs merge into a single line for heat transfer coefficient decreasing with increasing vapour quality. The data in the apparently-nucleate boiling condition are compared with a recent state-of-the-art three-zone evaporation model for the confined bubble flow regime without a nucleate boiling contribution. The model predicts the experimental data reasonably well but does not predict correctly the trends for changing pressure and diameter. Some suggestions are made for improving the model. The comparisons made in this paper support the statements by the developers of the model and others that the application of conventional macro flow boiling correlations to micro tube flow boiling heat transfer may not necessarily have a sound physical basis.
URI: http://bura.brunel.ac.uk/handle/2438/3211
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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