Computational Analysis of Subcooled Flow Boiling in a Vertical Minichannel with Two Different Shapes under Various Mass Fluxes

In the current research project, two-dimensional numerical simulations are conducted to analyze effects of geometrical configuration on flow structures and thermal performances subcooled boiling. The CFD carried out in two different configurations (straight periodic constriction expansion) a minichannel mounted vertically at four mass fluxes (500 kg/m2s; 836.64 1170 2535 kg/m2s). present predicted results exhibit excellent accordance with previous experiments, mean errors 6.39% 9.78%, demonstrating efficiency study. simulation show that expansion design provides good mixing between layers, leading 43.11% enhancement transfer, which is more important than slight pressure drop penalty 4.32 for flux 500 kg/m2s due combined along resulted from regions. Furthermore, visualization patterns shows bubbly dominant regime constriction-expansion configuration.