Mathematical Modeling of Phase Changes Processes in Cylindrical Energy Storages

The paper covers a brief overview on cylindrical energy storages with phase change. One-dimensional one-phase and two-phase problems of melting are considered as mathematical models of phase changes in heat storages. Recommendations on use of different ratios for determining heat transfer coefficient between heat transfer fluid and filler through the wall of the heat pipe are given for some particular cases of laminar and turbulent flow of heat transfer fluid. For calculations of one-phase model of melting filler the authors considered and justified possibility of using an approach similar to the Neumann solution for Stefan problem in rectangular coordinate system. Estimated time of phase change is given for the storage in which paraffin as filler and water as heat transfer fluid. Dependence for the position of liquid-solid interfaces from time and temperature distribution of filler liquid phase from radial coordinate have been illustrated.

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