サブクール沸騰気泡挙動に関する数値シミュレーション

抄録

In this study, with the aim of establishment of numerical boiling and condensation model on subcooled boiling, numerical simulation has been carried out in subcooled boiling bubble behavior using the MARS (Multi-interface Advection and Reconstruction Solver) developed by Kunugi. Bubble behavior in subcooled pool boiling is also visualized for the verification of the boiling and condensation model. The subcooled bubble behaviors, especially growing of the nucleated bubble on heating surface, are investigated. It is found that the bubble growth rate obtained by the numerical simulation is very large compared to the experimental one. In order to solve this discrepancy, an effect of unsteady heat conduction on the phase-change phenomena is considered in an enthalpy method. The computational results based on this model show that the bubble growth rate is close to the Rayleigh equation, and it approaches to the visualization results.