Abstract
Inward melting in a horizontal cylindrical capsule was studied experimentally and analytically. The shadowgraph technique was used to measure the local heat transfer coefficients at the heat source surface. The solid-liquid interface motion during phase change was recorded photographically. The convective motion in the liquid during melting was visualized using aluminum powder as a flow tracer. The experimental results reaffirmed the dominant role played by the natural convective fluid motion in the melt during the inward melting in the tube. In addition to the major natural convective recirculation flow in the liquid, secondary vortex circulation occurred at the bottom part of the melt region. To support the experiments, the data were compared with the numerical predictions and were found to be in good agreement.
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