Prof.  Peng-Sheng  Wei
National Sun Yat-Sen University,  China

Title: Solute Convection on Pore Shape Development in Solid

Abstract:

The effects of transport processes on the shapes of pores resulting from entrapped bubbles during solidification are numerically and theoretically investigated. Bubble formation results from supersaturation of dissolved gases in the liquid ahead of the solidification front. Pore formation and its shape in solid influence not only microstructure of materials, but also contemporary issues of biology, engineering, foods, geophysics and climate change, etc. In this study, equations of fluid flow, heat transfer and solute concentration are solved by using commercial COMSOL computer code. Scaling analysis shows that solute convection plays an important role inpore shape development during solidification. Solute convection influences not only thickness of solute concentration on the bubble cap, but also time for bubble entrapment. This work is critical to understand and control different types and sizes of pore shapes and their distributions in the solid in advance.

Biography: