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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

The effect of surface conditions on boiling heat transfer from mesh wicks

Get access (open in a dialog) DOI: 10.1615/IHTC12.4570
6 pages

要約

This work presents an investigation into the augmentation of heat transfer in saturated pool boiling from a vertical heater by roughening the heater surface and by covering it with layers of mesh. Tests have been carried out with a heater submerged in distilled water. Four different mesh types (mesh 50, 100, 150 and 200) and two different heater surface finishes (Ra,fine = 0.42 µm, Ra,emery = 1.04 µm) have been used. Results show that both enhancement techniques, i.e. roughening the heater surface and equipping a smooth heater with a single layer of mesh are effective, however a combination of the two techniques is ineffective and may lower heat transfer coefficients compared to those observed for the reference smooth surface. With a heater covered with multiple layers of mesh the influence of the surface roughness on the heat transfer diminished.
The experimental facility allowed measurement of the fluid and heater surface temperature and recording of the heat transfer process by using a high-speed video.
The results were correlated in terms of an enhancement factor E and a blocking factor B.B oth of these factors have been expressed as functions of the relevant mesh dimensions and liquid properties.