Abstract
This chapter discusses heat transfer with phase change in a horizontal tube. Melting or solidification inside a horizontal tube has received much attention as a model of thermal energy storage (TES) system. The phase change material (PCM) of solid phase could either be considered free to fall under gravity or be fixed spacewise at its core position. It was assumed in the latter case that secondary circulation related with the flow instability plays an important role in the melting process. The chapter describes a procedure in which the PCM that was filled initially in a horizontal circular tube was considered fixed at its core position to keep from falling free during melting. It was assumed that the whole system was initially at a melting temperature, T m , before the tube wall was abruptly heated to a higher temperature, T w . The melting was dominated by the conduction mode in the early stage. The natural convection played more significant role in later times at the upper part of the melt region, causing a streamlined shape of solid in the final stage of the process.
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