Numerical Simulation of Subcooled Boiling in Swing Rectangular Channel based on Non-Equilibrium Thermal Model

Abstract

Theoretical analysis on the fluid flow in a vertical rectangular channel under swing motion is performed to establish the mathematical model which is based on Eulerian two-fluid framework and non-equilibrium subcooled boiling model. It is analyzed that the flow and heat transfer characteristics and the force of the fluid under the condition of forced flow and swing motion condition. The results show that, for the existence of Coriolis force, the period of acceleration of the fluid is 1/2 of the period of swing angle, and the phase differ. In the rectangular channel, the angle of pressure isoline and horizontal line is sinusoidal likely, which is behind the swing angle phase; Due to the influence of the periodic force field, with the increase of the swing angle, the bubbles in the rectangular channel move to one side, and the wall temperature also increases, which leads to the deterioration of heat transfer; In a swing period, the vapor volume fraction at the outlet and the pressure drop between the inlet and outlet of the rectangular channel fluctuate, and the vapor volume fraction is located at the minimum pressure drop, and the vapor volume fraction at the outlet fluctuates in a trough type.