Shape of a pore trapped in solid during solidification

The axisymmetric shape of a pore resulting from a bubble trapped by a solid ification front is experimentally and theoretically investigated. Accountin g for momentum, energy, mass, and species transport and physico-chemical eq uilibrium at the moving cap surface of the pore and introducing a time-depe ndent mass transfer coefficient derived from a scale analysis, the results find the effects of dimensionless parameters governing mass transfer coeffi cient, the maximum and decaying rate of displacement of the solidification front, Henry's constant, concentration in bulk liquid, surface tension, and cap angle on the shape of the pore. Comparisons between the computed and m easured variations in the pore length and cap radius with time are also pre sented. (C) 1999 Elsevier Science Ltd. All rights reserved.