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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

MOLECULAR DYNAMICS SIMULATION OF BUBBLE NUCLEATION ABOVE SURFACE WITH DIFFERENT CAVITIES

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.022315
pages 7161-7179

Abstract

Molecular dynamic simulations are performed to study the bubble nucleation of argon film above platinum cavity surfaces with wettability of weak hydrophilicity. First of all, comparisons are made between surfaces with and without cavity. It is found that there is an obvious bubble nucleus turns up above surface with a triangular cavity, while only a gas film above smooth surface. The cavity provides more heat transfer area for argon film to obtain more energy. It is confirmed by the temperature profile near surface. Then, both the areas of smooth region and cavity region are kept unchanged, and the common cavities of triangle, rectangle and trapezoid are constructed to explore their effects on bubble nucleation. There is almost no difference in growth rates of bubble nuclei above the three surface. Besides, the absorbed heat flux of argon shows the same trend. It indicates that cavity structures have little influence on the efficiency of bubble nucleation. All of the bubble nuclei merge into gas films finally, because periodic boundaries are applied in the directions parallel to the surface.