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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.190
pages 220-229

An Experimental Study for Combined Close-Contact and Natural Convection Melting in a Spherical Capsules

Takeo S. Saitoh
Department of Aeronautics and Space Engineering, Tohoku University, Sendai 980 Japan
J. H. Moon
Department of Aeronautics and Space Engineering, Tohoku University, Sendai, Japan

ABSTRACT

The combined melting processes of the phase change material (PCM) in spherical capsules were investigated experimentally under various ambient temperature conditions. The spherical capsules filled with the solid n-octadecane initially at its melting temperature were instantaneously submerged into a constant-temperature bath. The density of the solid exceeds that of the liquid, which allows the solid bulk continually to drop toward the bottom of the capsule as melting progresses. It was shown that molten mass fraction can be represented as a function of a dimensionless parameter (t*Ste3/4Ar1/4), with f being the Fourier number, Ste the Stefan number, and Ar the Archimedes number. The melting shape and the complete melting time for various Stefan numbers has been studied. Further, the effect of ambient pressure was also clarified by the experiment. For the capsule with small diameter, it was found that heat conduction is a dominant heat transfer mode. The combined natural convection and close contact melting effects should be considered under large diameter and high Stefan number cases. The present experimental data will be compared with the analytical results by other researchers.


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