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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Highly Subcooled Water Boiling: Some New Details of the Process

Get access (open in a dialog) DOI: 10.1615/IHTC15.pbl.009265
pages 6083-6095

Resumo

Experimentally studying of highly subcooled water boiling has been conducted. On the basis of high speed (100 kHz) filming of the boiling process the data on statistical characteristics (bubble population density, bubble dimensions and life time, etc.) that expand the existed database are obtained. Some important details concerning the boiling mechanism are refined. It is shown that, at subcooled water boiling, vapor bubble incipience is chaotic in nature and permanently active nucleation cites are absent. This is the case for both technically smooth heating surfaces and those with artificial roughness. New details on the vapor bubble behavior at the bubble collapse stage are presented. The behaviors of large vapor agglomerates that appear at approaching boiling crisis are described. It is experimentally shown that the micro bubbles emission during subcooled water boiling is the emission of fine air bubbles.