NUMERICAL ANALYSIS OF CONVECTIVE BOILING HEAT TRANSFER OF A HORIZONTAL TUBE IMMERSED IN A SATURATED LIQUID WITH AN UPWARD VELOCITY

摘要

Numerical simulation of boiling heat transfer of a horizontal tube is important. It can provide insight into the modeling of boiling phenomena and help select the right models to predict heat transfer for industrial applications such as in kettle reboilers. In this study, heat transfer characteristics of convective boiling on the outside of a horizontal tube immersed in a large saturated liquid with upward velocity is studied numerically by using finite volume method with the mixture model in multiphase flow. Turbulence is modeled by the standard k — ε model in mixture of multiphase. For different heat fluxes with different upward flow velocities, the local angular distribution of heat transfer coefficient and void fraction around the tube are presented. The results are compared with relevant experimental data .