Paper Submission
04. Boiling and Multi-Phase Flow
Two-Phase Immersion Cooling Simulation with Multiple Multiphase Flow Models
Two-Phase Immersion Cooling Simulation with Multiple Multiphase Flow Models
Two-Phase Immersion for electronic device involves multiple heat and mass transfer phenomenon, including boiling, natural convection and condensation. To simulate these physics phenomenon accurately and efficiently, different multiphase flow models is used. These models include Volume Of Fluid, Lagrangian Multiphase and fluid film model, and on top of that boiling and condensation models are also required to predict the heat transfer and phase change phenomenon. CFD software Star CCM+ is used to perform this simulation.
The model used is a plate with constant temperature immersed in working fluid, the working fluid is fluorinated fluid commonly used in Two-Phase Immersion Cooling, the temperature of the plate is set above the boiling temperature so boiling is present on the surface of the plate, the produced vapor will rise up due to buoyancy, and exit from the free surface of the fluid into the vapor region. In the vapor region is a round rod at constant temperature as the condenser, the temperature is set lower than the condensation temperature of the vapor so condensation would be present on the surface of the condenser. The condensed liquid would first form fluid films on the surface of the condenser due to surface tension, as the fluid film thickens, gravity would overcome surface tension and droplets would be formed. The droplets would detach from the surface of the condenser once they reach critical size, falling into the liquid pool.
Key challenges of simulating Two-Phase Immersion Cooling include finding suitable boiling and condensation model to correctly estimate heat and mass transfer rate. The other key challenge is how mass is transferred between the 3 multiphase flow models. The aim of this article is to show how to manage these 3 challenges.
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Author Information
Tun-Hung Lee
Mr.
Presenting author