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ISBN: 978-1-56700-537-0

ISBN Online: 978-1-56700-538-7

ISSN Online: 2377-424X

International Heat Transfer Conference 17
August, 14-18, 2023, Cape Town, South Africa

NUMERICAL SIMULATIONS ON THE EFFECT OF AN ELECTRIC FIELD ON VAPOR BUBBLE GROWTH IN MICROGRAVITY

Get access (open in a dialog) DOI: 10.1615/IHTC17.50-10
10 pages

摘要

Nucleate boiling in microgravity is very different to nucleate boiling in gravity due to the lack of buoyancy forces. The vapor bubbles are not removed from their nucleation site, which deteriorates heat transfer. The application of an electric field in nucleate boiling in microgravity enables manipulation of bubble shape and location in a dielectric fluid by the dielectrophoretic and electrostrictive forces. Experiments with an electric field were conducted within the "Multiscale Boiling Project" onboard the International Space Station. This project is a.o. accompanied by numerical modeling with a Volume-of-Fluid solver with phase change capabilities in OpenFOAM, which is developed and validated against the experimental data. The capabilities of this solver were extended by the implementation of the modeling of the electric field and the corresponding electric forces. In order to validate against selected experimental data, numerical simulations were performed and analyzed regarding bubble shape and size. Good agreement could be achieved. Now the interplay between phase change and electric field can be researched more in detail.