scholarly journals Enhancement of Nucleate Pool Boiling Heat Transfer in Ammonia/Water Mixtures : Effect of Surface-Active Agent(Thermal Engineering)

2010 ◽  
Vol 76 (762) ◽  
pp. 306-311 ◽  
Author(s):  
Toshiaki INOUE ◽  
Masanori MONDE ◽  
Teruki KUWAHARA ◽  
Yoshio TERUYA
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Surface Active Agent ◽  
Pool Boiling ◽  
Active Agent ◽  
Thermal Engineering ◽  
Nucleate Pool Boiling ◽  
Ammonia Water ◽  
Surface Active ◽  
Effect Of Surface

Nucleate Pool Boiling Heat Transfer Measurement and Flow Visualization for Ammonia-Water Mixture

2011 ◽  
Vol 133 (10) ◽  
Author(s):  
A. Sathyabhama ◽  
T. P. Ashok Babu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Boiling Heat Transfer ◽  
Mass Fraction ◽  
Pool Boiling ◽  
Bubble Nucleation ◽  
Water Mixture ◽  
Nucleate Pool Boiling ◽  
Ammonia Water

Visualization of bubble nucleation during nucleate pool boiling outside a vertical cylindrical heated surface was done for ammonia-water binary mixture in order to obtain a descriptive behavior of the boiling, which was directly compared with the measured heat transfer coefficient data at low pressure of 4–8 bar and at low mass fraction of 0 < x < 0.3 and at different heat flux. Still images taken with high speed camera are used to demonstrate the decrease in boiling heat transfer coefficient with increase in ammonia mass fraction. Jensen and Memmel model has better agreement with experimental bubble diameter. Further work is required to obtain quantitative information about bubble nucleation parameters. It is found that both Calus and Rice and Stephan–Koorner correlation can predict the experimental heat transfer coefficient values with a maximum deviation of ± 20%.

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