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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

NONSTEADY FILM BOILING OF SUBCOOLED WATER-ETHANOL MIXTURES

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.022327
pages 1103-1110

Abstract

According to the available experimental data, the high-intensity heat transfer regime, named "micro-bubble boiling", occurs instead stable film boiling in cooling high-temperature bodies in water subcooled over 25 K. Investigation of cooling a hot surface in a subcooled liquid is a step to understanding of the nature of vapor explosion. The present experimental study is directed to revealing regularities of "micro-bubble boiling" phenomenon. New experimental data on heat transfer in pool film boiling of subcooled ethanol-water mixtures at spherical surfaces are considered. The solutions with ethanol mass fraction from 10 to 91% and temperature of liquid from -10 to +70 °C were examined as cooling media under atmospheric pressure. Besides the bared stainless steel sphere of 39 mm in diameter, the same sample with carbon coating was used. Boiling heat transfer intensifies with ethanol concentration decreasing at the fixed mixture temperature. It means that stable film boiling duration decreases and earlier transition to the intensive heat transfer regime occurs with growth of water mass fraction in mixture.