Fundamental melting process of water-insoluble phase change material immersed in water

Tsuyoshi Kawanami, Ryota Hirai, Katsuaki Shirai, Shigeki Hirasawa

Research output: Contribution to journalArticle

Abstract

This study examined the melting behavior and heat transfer characteristics of a water-insoluble material immersed in water. n-Hexadecane, popularly used as a phase change material, was selected as the water-insoluble material. A rectangular n-hexadecane solid was immersed in water. The n-hexadecane block was then vertically fixed onto the copper plate of the cooling wall. The flow structure of the free convection of water was visualized by mixing tracer particles with the water, and a laser sheet entered from the opposite side of the cooling wall as a light source. Its melting behavior and melting rate were then observed under various water temperatures in a test vessel. The local heat transfer coefficients of n-hexadecane were calculated from its melting rate and latent heat. In addition, the thickness of the melting liquid of n-hexadecane was calculated using a simple analysis model. As the experimental results, it flows upward along the n-hexadecane block, accumulates at the top of the solid as a droplet, and then flows upward vertically because the melting liquid of n-hexadecane does not diffuse in water. The calculated thickness of the melting liquid of n-hexadecane increases drastically near the lower end and increases almost monotonically and at a mild rate in other parts of the block. The analytical and experimental local heat transfer coefficients showed good agreement at low water temperatures. The calculated local heat transfer coefficients changed slightly, except for those at the top and low parts of the block. The local heat transfer coefficients increased in most locations as time elapsed in the experiment.

Original languageEnglish
Article number17-00348
JournalJournal of Thermal Science and Technology
Volume12
Issue number2
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

phase change materials
Phase change materials
Melting
melting
Water
heat transfer coefficients
water
Heat transfer coefficients
water temperature
liquids
cooling
Liquids
latent heat
Cooling
free convection
n-hexadecane
tracers
vessels
Latent heat
light sources

Keywords

  • Heat transfer
  • Latent heat
  • Natural convection
  • Phase change material
  • Thermal energy storage

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Instrumentation
  • Engineering (miscellaneous)

Cite this

Fundamental melting process of water-insoluble phase change material immersed in water. / Kawanami, Tsuyoshi; Hirai, Ryota; Shirai, Katsuaki; Hirasawa, Shigeki.

In: Journal of Thermal Science and Technology, Vol. 12, No. 2, 17-00348, 01.01.2017.

Research output: Contribution to journalArticle

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