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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

AN APPROXIMATE MODEL OF INCIPIENCE OF HIGHLY INTENSIVE FILM BOILING REGIME IN SUBCOOLED LIQUIDS

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.022322
pages 713-720

Аннотация

Under the conditions of high liquid subcooling a particular film boiling regime with high heat transfer intensity occurs, its first description as microbubble boiling regime was presented in [1]. Based on the analysis of published works and own experimental data the main characteristics and conditions of occurrence of this regime are determined. An approximate model of incipience of highly intensive film boiling regime in subcooled liquids is first presented. This regime appears as a result of local contacts of the crests of wavy liquid flow at the liquid/vapour interface with the protrusions of the solid surface roughness. At the boundary of the wetted micro area, extremely high heat flux arises that is determined by full evaporation of liquid, which inflow is controlled with the capillary pressure gradient. The ratio of the heat flux due to intensive liquid evaporation to the unsteady heat flux from the cooled body volume determines the conditions of incipience of the intensive heat transfer regime in film boiling of subcooled liquids. The experiments conducted in different liquids with spheres of different metals confirm the model.