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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Bubble Dynamic Parameters and Pool Boiling Heat Transfer on Plasma Coated Tubes in Saturated R-134a and R-600a

[+] Author and Article Information
Shou-Shing Hsieh

Dean of Engineering,

Chung-Guang Ke

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424

J. Heat Transfer 124(4), 704-716 (Jul 16, 2002) (13 pages) doi:10.1115/1.1481360 History: Received July 27, 2001; Revised March 12, 2002; Online July 16, 2002
Copyright © 2002 by ASME
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References

Figures

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Local averaged bubble velocity distribution versus vertical position
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Local averaged bubble velocity versus vertical position
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Bubble diameter versus bubble velocity
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UT versus d and the deviation of UT correlation with experimental results
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Bubble departure frequency as function of heat flux
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Nucleation site density with heat flux
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n as a function of the relevant parameters
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(a) Heat transfer coefficient versus heat flux and (b) latent/sensible heat flux ratios for enhanced surfaces
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Heat transfer with experimental data
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Photography technique and LDV facility schematic for recording bubble dynamic data
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(a) Test section; (b) Thermocouple positions and test specimen
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SEM observations for test tubes
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Illustration of boiling visualizations: (a) smooth tube 1 kW/m2 , R-134a; (b) smooth tube 0.6 kW/m2 , R-134a; (c) coated tube (Mo) 1 kW/m2 , R-134a; (d) coated tube (Mo) 0.6 kW/m2 , R-134a; (e) coated tube (Cu) 1 kW/m2 , R-134a; (f ) coated tube (Cu) 0.6 kW/m2 , R-134a; (g) smooth tube 1 kW/m2 , R-600a; (h) smooth tube 0.6 kW/m2 , R-600a; (i) coated tube (Mo) 1 kW/m2 , R-600a; (j) coated tube (Mo) 0.6 kW/m2 , R-600a; (k) coated tube (Cu) 1 kW/m2 , R-600a; and (l) coated tube (Cu) 0.6 kW/m2 , R-600a.

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