Subcooled flow boiling is widely used in many cooling systems due to its high cooling effect. In such systems, it is very important to accurately analyze the boiling heat transfer behavior of working fluid. Therefore, there have been several researches on accurately analyzing the behavior of subcooled flow boiling heat transfer by using commercial Computational Fluid Dynamics (CFD) codes. Most of the researchers have used the RPI (Rensseler Polytechnic Institute) model within Eulerian multi-phase framework in their CFD simulations of subcooled flow boiling heat transfer.
In a word, there have been many studies on the CFD analysis of subcooled flow boiling and a lot of progress has been made in terms of accuracy. However, most of the previous works for CFD simulations considered water as the working fluid, and the works for the CFD simulations with CO2 as the working fluid are rare.
Ma Kuk Chol, a researcher at the Faculty of Heat Engineering, has developed a mathematical model to simulate the subcooled flow boiling of CO2 by utilizing the Eulerian multi-phase model combined with the RPI and IAC models, and solved the model by means of the CFD solver, ANSYS FLUENT 19.3.
Thus, he proved that the coefficient of heat transfer is greatly affected by bubble waiting time coefficient (CWT) and critical Weber number (Wecri) and determined reasonable CWT and Wecri.
The details are found in his paper “Determining of bubble waiting time coefficient, critical Webber number and turbulence model for modeling of subcooled flow boiling heat transfer of CO2 at low temperature” in “Applied Physics A” (SCI).
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