Numerical Study on Bubble Dynamics and Heat Transfer of Subcooled Flow Boiling in Microchannels

A numerical study on the bubble dynamics and heat transfer characteristics of subcooled flow boiling in a microchannel was conducted using a multiphase flow and heat transfer computational code modified from the open-source CFD solver OpenFOAM. Simulations were performed over a wide range of operating conditions, including average liquid velocities of ۰.۰۳, ۰.۱۵, ۰.۵, and ۱ m/s; applied heat fluxes of ۱۲۰, ۳۰۰, ۶۰۰, and ۹۰۰ kW/m۲; and subcooling degrees of ۱, ۳, and ۵ K. The effects of applied heat flux, flow rate (velocity), and subcooling degree on bubble dynamics and heat transfer performance were systematically compared and analyzed. This was achieved by examining the bubble evolution process and evaluating quantitative heat transfer data obtained from the simulations. The results indicate that improved heat transfer performance is achieved at higher applied heat fluxes, lower flow velocities, and lower subcooling degrees.

کلیدواژه ها:

Subcooled flow boiling ، Numerical simulation ، Microchannels ، Bubble dynamics ، Heat transfer