4349 Experimental study of influence of mass velocity and heat flux on carbon dioxide flow boiling heat transfer coefficient in horizontal smooth tube

2006 ◽  
Vol 2006.3 (0) ◽  
pp. 105-106
Author(s):  
Katsumi HASHIMOTO ◽  
Akihiro KIYOTANI ◽  
Naoe SASAKI
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Experimental Study ◽  
Heat Flux ◽  
Heat Transfer Coefficient ◽  
Boiling Heat Transfer ◽  
Mass Velocity ◽  
Flow Boiling ◽  
Flow Boiling Heat Transfer ◽  
Boiling Heat Transfer Coefficient

Flow Boiling Heat Transfer of R-22 in Small-Diameter Horizontal Round Tubes

2003 ◽  
Author(s):  
K. S. Park ◽  
W. H. Choo ◽  
K. H. Bang
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Mass Flux ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Vapor Quality ◽  
Flow Boiling Heat Transfer ◽  
Boiling Heat Transfer Coefficient

The flow boiling heat transfer coefficient of R-22 in small hydraulic diameter tubes has been experimentally studied. Both brass and aluminum round tubes of 1.66 mm inside diameter are used for the test section. The ranges of the major experimental parameters are 300∼600 kg/m2s of refrigerant mass flux, 10∼20 kW/m2 of the wall heat flux, 0.0∼0.9 of the inlet vapor quality. The experimental result showed that the flow boiling heat transfer coefficient in this small tubes are in the range of 2∼4 kW/m2K and it varies only by heat flux, independent of mass flux and vapor quality. It is also observed that the heat transfer coefficients in the aluminum tube are up to 50% higher than in the brass tube.

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