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Abstract of "A PORE TRAPPED IN SOLID DURING SOLIDIFICATION"

DOI: 10.1615/ICHMT.2000.TherSieProcVol2.310
99 pages

S. H. Chiu
Mechanical Engineering Department, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan, Republic of China

Y. K. Kuo
Mechanical Engineering Department, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan, Republic of China

P. S. Wei
Mechanical Engineering Department, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan, Republic of China

Abstract

Unsteady growth of pores in solid behind the interface advancing in the upward direction is experimentally and theoretically investigated. The working medium is distilled water which is poured inter a heat-treated glass tube with the lowest temperature at the bottom and the surrounding temperature at the top. Observing from a zoom microstereoscope shows the nucleation and growth of the bubbles on the interface and the subsequent formation of the pores in solid. The wall of the pore can be corrugated, melted and solidified, or remain the same shape depending on the pore filled or partially filled with gases or water. By accounting for unsteady mass, momentum, energy and species transport, and physico-chemical equilibrium on the cap surface, the predicted results show agreement with the measured locations of the solidification front, cap radii and shapes of the pore. The shape of the pore is strongly affected by solidification rate. In earlier stage of solidification, rapid freezing enhances mass transfer and gas pressure in the pore. The growth of cap radius is attributed to the decreasing rate of gas pressure overriding that of hydrostatic pressure on the cap. An oscillating interface fluctuates mass transfer and gas pressure. As the decreasing rate of gas pressure becomes the same order of that of hydrostatic pressure in later time, the wall of the pore readily corrugates.

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