Effects of dynamic load on flow and heat transfer of two-phase boiling water in a horizontal pipe |
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Authors: | Qiu-ping Yao Bao-yin Song Mei Zhao Xi Cao |
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Institution: | (1) Department of Man-Machine-Environment Engineering, Nanjing University of Aeronautics and Astronautics, 210016 Nanjing, People’s Republic of China;(2) Faculty of Engineering, Shinshu University, Nagano 3808553, Japan |
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Abstract: | An experimental investigation was performed to obtain the flow and heat transfer characteristics of single-phase water flow
and two-phase pipe boiling water flow under high gravity (Hi-G) in present work. The experiments were conducted on a rotating
platform, and boiling two-phase flow state was obtained by means of electric heating. The data were collected specifically
in the test section, which was a lucite pipe with inner diameter of 20 mm and length of 400 mm. By changing the parameters,
such as rotation speed, inlet temperature, flow rate, and etc., and analyzing the fluid resistance, effective heat and heat
transfer coefficient of the experimental data, the effects of dynamic load on the flow and heat transfer characteristics of
single phase water and two-phase boiling water flow were investigated and obtained. The two-phase flow patterns under Hi-G
condition were obtained with a video camera. The results show that the dynamic load significantly influences the flow characteristic
and boiling heat transfer of the two-phase pipe flow. As the direction of the dynamic load and the flow direction are opposite,
the greater the dynamic load, the higher the outlet pressure and the flow resistance, and the lower the flow rate, the void
fraction, the wall inner surface temperature and the heat transfer capability. Therefore, the dynamic load will block the
fluid flow, enhance heat dissipation toward the ambient environment and reduce the heat transfer to the two-phase boiling
flow. |
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