Biomaterials

The pore shape in solid as a result of entrapment of a bubble by a solidification front is predicted in this work. Pore formation in solid influence microstructure of materials and contemporary issues of biology, engineering and climate change, etc. This work extends previous models by accounting for realistic mass and momentum transport across a self-consistent shape of the bubble cap. It is found that there exist three stages of solute concentration at the cap or solute gas pressure in the pore during solidification for initial contact angle greater than 90 degrees. Significant drops occur in the early stage and end of a middle stage at which solute concentration at the cap is about that in liquid far from the solidification front and contact angle is near 90 degrees. On the other hand, solute concentration at the cap exhibits two stages in most cases. The predicted pore shape agrees with experimental data. Increases in mass transfer coefficient and solidification rate decrease the pore radius. The predicted pore shape agrees with experimental data.

 

 

 

Recent Publications:
 

1. Wei PS, Chao TC (2016) The effects of drilling parameters on pore size in keyhole mode welding. ASME Journal of Manufacturing Science and Engineering; 138: 021008.
2. Wei PS, Chang CC (2016) Existence of universal phase diagrams for describing general pore shape resulting from an entrapped bubble during solidification. ASME Journal of Heat Transfer; 138: 104503.
3.  Wei PS, Hsiao SY (2016) Effects of mass transfer coefficient on pore shape in solid. International Journal of Heat and Mass Transfer; 103: 931-939.
4.  Wei PS, Hsiao SY (2016) Effects of solute concentration in liquid on pore shape in solid. International Journal of Heat and Mass Transfer; 103: 920-930.