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Hydrodynamic cavitation and boiling in refrigerant (R-123) flow inside microchannels |
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| Affiliation: | 1. Sabanci University, Nanotechnology Research and Application Center, Orta Mahalle, 34956 Tuzla, Istanbul, Turkey;2. Mechatronics Engineering Program, Faculty of Engineering and Natural Science, Sabanci University, Orhanli, Tuzla, Istanbul 34956, Turkey;3. Integrated Manufacturing Technologies Research and Application Center, Sabanci University, Tuzla 34956, Istanbul, Turkey;4. Molecular Biology Genetics and Bioengineering Program, Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkey;5. Center of Excellence for Functional Surfaces and Interfaces for Nano-Diagnostics (EFSUN), Sabanci University, Orhanli, Tuzla, Istanbul 34956, Turkey;1. Department of Mechanical Design Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea;2. Department of Food and Nutrition, Hanyang University, 222, Wangsimri-ro, Seongdong-gu, Seoul 04763, Republic of Korea;3. Department of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea |
| Abstract: | This research article investigates the effect that hydrodynamic cavitation has on heat transfer. The fluid medium is refrigerant R-123 flowing through 227 μm hydraulic diameter microchannels. The cavitation is instigated by the inlet orifice. Adiabatic tests were conducted to study the two-phase cavitating flow morphologies and hydrodynamic characteristics of the flow. Diabatic experiments were performed resulting in surface temperatures under heat fluxes up to 213 W/cm2 and mass velocities from 622 kg/m2 s to 1368 kg/m2 s. Results were compared to non-cavitating flows at the same mass velocities. It was found that the cavitating flows can significantly enhance the heat transfer. The heat transfer coefficient of the cavitating flows was larger than the non-cavitating flows by as much as 84%. Single-phase and two-phase heat transfer coefficients have been elucidated and employed to deduce the heat transfer mechanism prevailing under boiling conditions with and without the presence of cavitation. |
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