Fundamental study on subcooled boiling of binary mixture of anti-freezing liquid toward advanced cooling technology for a SiC-based on-vehicle inverter
In this study, subcooled pool boiling characteristics especially in a microbubble emission boiling (MEB) regime are investigated for binary mixture of water and ethylene-glycol. The effects of the concentration are evaluated at 30 vol%, 50 vol% and 70 vol% under the pressurized conditions of 50 kPag (0.5 atg) and 100 kPag (1.0 atg). Although MEB occurs in all the cases utilizing water as cooling liquid in this experiment, stable and stormy MEB (S-MEB) is clearly observed only at the liquid subcooling of 50 K at the concentration of 30 vol% under atmospheric condition, which indicates that increasing the concentration suppresses the occurrence of MEB. On the other hand, with increasing pressure, MEB also becomes more difficult to be induced. It is confirmed that only calm MEB (C-MEB) appears at the liquid subcooling of 50 K and at the liquid concentration of 30 vol% under the pressurized conditions of 50 kPag and 100 kPag. These findings are summarized as a MEB map.
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