In this paper, a new kind of evaporative heat transfer experiment for the cooling process of coolers/condensers is conducted. The design of the test coils is immersed in an air-water bubbling layer. The air-water two-phase flow passes through the tubes of the coils. Due to the motion of the air bubbles in the water, a thin water film forms on the surface of the tube. As the air bubbles pass by the tube this water film is evaporated into the air. The tubes of coil reject heat to the water film, and the evaporation of the water film rejects heat to the air bubble stream. This heat transfer mode significantly increases the heat transfer coefficient between tubes and air. The consumption of the power of a water pump can be decreased. Moreover, the airflow rate required is less than that of an air-cooled condenser. The pressure drop of air through air-water bubbling layer and the heat transfer between the tube and water are experimentally investigated in this paper. The results show that the factors affecting the pressure drop and the heat transfer coefficient involve the pore geometry of sieve plate, the height of the air-water bubbling layer, the air flow rate through the sieve plate and the heat flux of tubes. The heat transfer coefficient between tube and water is two times larger than that of falling film of water on the outer surface of tube.
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ASME 3rd International Conference on Microchannels and Minichannels
June 13–15, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4185-5
PROCEEDINGS PAPER
Experimental Study on Evaporative Heat Transfer of Air-Water Bubbly Flow
Q. Chen,
Q. Chen
University of Wisconsin at Milwaukee, Milwaukee, WI
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R. S. Amano
R. S. Amano
University of Wisconsin at Milwaukee, Milwaukee, WI
Search for other works by this author on:
Q. Chen
University of Wisconsin at Milwaukee, Milwaukee, WI
R. S. Amano
University of Wisconsin at Milwaukee, Milwaukee, WI
Paper No:
ICMM2005-75158, pp. 665-669; 5 pages
Published Online:
November 11, 2008
Citation
Chen, Q, & Amano, RS. "Experimental Study on Evaporative Heat Transfer of Air-Water Bubbly Flow." Proceedings of the ASME 3rd International Conference on Microchannels and Minichannels. ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B. Toronto, Ontario, Canada. June 13–15, 2005. pp. 665-669. ASME. https://doi.org/10.1115/ICMM2005-75158
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