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The effect of coalescence on droplets size distribution in wet steam flow

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During the crossing and rapid expansion of steam in turbines, the vapour first supercooled and then with nucleation to become a wet steam. The droplets in wet steam change their properties due to several mechanisms. The most common mechanisms are coalescence (aggregation), breakage, nucleation and growth. In this study, we model coalescence between droplets colliding with each other because of turbulent fluctuations in the surrounding continuous phase in a converging-diverging nozzle. Droplets size distribution are predicted and compared with experimental results. It is found from the numerical simulation results that by considering coalescence between droplets, their size distribution approach the experimental data. Therefore this solution could be effective in designing the steam nozzle and turbine blades.

Author(s):

Sima Shaabani    
Hakim Sabzevari University
Iran

Esmaeil Lakzian    
Hakim Sabzevari University
Iran

GH. Farzi    
Hakim Sabzevari University
Iran