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doi: 10.3850/978-981-08-7614-2_IMPRES072
Boiling Heat Transfer and Pressure Drop of a Refrigerant Flowing Vertically Upward in Small Rectangular and Triangular Tubes
Koji Enoki1,a, Kazushi Miyata2, Hideo Mori2, Keishi Kariya2 and Yoshinori Hamamoto2
1Department of Mechanical Engineering, Graduate School, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
aenoki@therme.mech.kyushu-u.ac.jp
2Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
ABSTRACT
In the present study, experiments were performed to examine the characteristics of flow boiling heat transfer and pressure drop of a refrigerant R410A flowing vertically upward in small copper rectangular and triangular tubes with the hydraulic diameter of 1.04 and 0.88 mm respectively for the development of a high-performance heat exchanger using small tubes or mini-channels for air-conditioning systems. Their characteristics were clarified by comparing the measurements with the data for the small circular tube of 1.00 mm I.D. previously obtained. In the rectangular and triangular tubes, the pressure drop was found to be slightly less and the heat transfer was much better than those in the circular tube.
Keywords: Flow boiling heat transfer, Pressure drop, Refrigerant, Mini-channel, Vertical flow.
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