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10:40
20 mins
Thermal Nucleated Bubbles Investigation in Subcooled Novec 7100 Boiling Induced by Megasound Streaming for Electronics Cooling Applications
Teerapat Thungthong, Tatsuo Sawada, Kunthakorn Khaothong, Jetsadaporn Priyadumkol, Weerachai Chaiworapuek
Session: Control of heat transfer I
Session starts: Wednesday 05 November, 10:20
Presentation starts: 10:40
Room: Lecture room A
Teerapat Thungthong (Kasetsart University)
Tatsuo Sawada (Kasetsart University)
Kunthakorn Khaothong (Kasetsart University)
Jetsadaporn Priyadumkol (Mahidol University)
Weerachai Chaiworapuek (Kasetsart University)
Abstract:
This study examines how megasound-induced streaming affects nucleated bubble behavior and heat transfer in the subcooled flow boiling of Novec 7100, which is crucial for advanced electronics cooling. The peak dimensionless temperature of 1.8 was found at the lowest heat flux highlights a significant enhancement in heat transfer coefficients. The mechanism is visualized using DSLR cameras and Particle Image Velocimetry (PIV) measurements. The visualize results demonstrated that megasound effectively disperses thermal bubbles, particularly at lower heat fluxes, preventing the formation of large insulating vapor blankets on the heated surface. PIV measurements quantified this effect, revealing an increment in near-wall fluid velocity due to megasound-induced acoustic streaming. This enhanced flow effectively removes heat from the surface. The combination of bubble dispersion and increased fluid velocity significantly improves heat transfer efficiency, highlighting the potential of megasound-induced streaming for next-generation, high-performance electronics cooling solutions.