Numerical Simulation Of Ice Melting And Heat Transfer

We begin with introducing the solution and data process technology in CFD. And CFD, basic theory of numerical simulation as well as grid generation technology are presented. In order to solve the boundary problem of ice melting, the basic theory of it is introduced. And the coupled calculating equation of ice melting boundary is educed in terms of energy equations in phase change. And the new boundary position is solved. The Space Conservation Law is employed to update the Jacobian number in order to eliminate the effects of moving mesh on numerical stability and avoid the false mass source term arises with moving grid.In this thesis, the governing equations are discretized on the collocated grids in a body fitted coordinate by using finite volume methods. The QUICK and central differencing schemes are used for the discretizations of convectional term and diffused term respectively. The SIMPLE algorithm is employed to decouple velocities and pressure. Grid generation is using moving mesh technology in a body fitted coordinates.Energy release from ice melting and internal melt ice-on-coil during a charging cycle problem is simulated successfully through solving finite volume method in the N-S equations.The characteristics of the moving interface between the ice and water area during melting process are studied. Propagations of the temperature field and melting interface are obtained. The changes of melting curve, local Nusselt number and mean Nusselt number varying with time are presented with figures. In addition, this paper shows the analysis for energy release property varying with the different inlet temperature and velocity during the discharging cycle in the different way of heat transfer, and the rules of heat transfer in ice melting is gained. The conclusion shows: .for the energy release from ice melting problem, because of the existence of the influence of natural and forced convection on both melting of an ice layer and flow of liquid layer, the influence of the way to release energy to the rate of ice melting and effect of the energy release is obvious. Anticlockwise circulation in water area is formed after high temperature water is injected to the water area due to the influence of natural convection. The further the outlet position in this anticlockwise circulation is from the inlet position which is on the bottom of the right boundary; the better is the effect of the energy release. For the internal melt ice-on-coil during a charging cycle problem, with the increasing of the time the local Nusselt decreases and so does the range of local Nusselt decrease. From the track of ice melting, the influence of the natural convection is obvious...