Study on heat driven pump. Part 2-Mathematical modeling

Literature shows that the study on heat driven pump mainly focused on the experimental aspect. Numerical modeling is scarce. In this paper a numerical model is proposed to simulate the thermal hydraulic characteristics of a heat driven pump based on a variable-node moving boundary formulation. In the two-phase region of the heat driven pump, homogeneous equilibrium flow is assumed. The governing equations are successfully integrated over the single-phases and two-phase timedependent regions. The simulation results demonstrate that the working principle of the pump could be sub-divided into four distinct stages. Attempts have been made to compare the predictions with experimental data. The detailed thermal hydraulic characteristics, cycle behavior and factors affecting the pump performance are presented and discussed.