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Okawa, Tomio
International journal of heat and mass transfer, December 2021, 2021-12-00, 20211201, Letnik: 181Journal Article
•Mechanism of OSV in subcooled flow boiling was investigated theoretically.•OSV was supposed to be triggered by global bubble coalescence.•OSV resembles the transition from babbly to slug flows in two-phase flow.•Heat flux spent for vaporization was estimated using Chen's correlation.•Calculated OSV condition agreed with Saha-Zuber correlation well. Theoretical investigation was carried out for a possible mechanism of the onset of significant void (OSV) or net vapor generation (NVG) in subcooled flow boiling. Based on available knowledge on the two-phase flow regime transition from bubbly to slug flows, it was postulated that bubble coalescence is intensified substantially when the local void fraction near the heated wall exceeds a critical value. It was discussed that this can be a main cause of a rapid increase in the cross-sectional area-averaged void faction since the condensation rate decreases suddenly due to a sudden decrease in the interfacial area of vapor bubbles. It was demonstrated that if the vaporization rate on the heat transfer surface is evaluated using a reliable wall heat transfer correlation, the OSV conditions calculated by the present model agree with those by a widely-used empirical correlation well.
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