Bubble growth in viscous newtonian and non-newtonian liquids

✍ Scribed by Moshe Favelukis; Ramon J. Albalak

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 559 KB
• Volume: 63
• Category: Article
• ISSN: 0923-0467
• DOI: 10.1016/s0923-0467(96)03119-3

✦ Synopsis

A model for the dynamics of hydrodynamically controlled spherical bubble growth in quiescent viscous newtonian and non-newtonian liquids is presented. Two constitutive equations were used to describe the behavior of the liquid medium: ( 1 ) a simple power law relation and (2) a truncated power law. Application of the truncated power law resulted in four different cases: (a) at all times the liquid acts as a newtonian liquid; (b) at all times the liquid behaves as a simple power law liquid; (c) at all times the liquid close to the growing bubble obeys a power law relation and the liquid far away from the bubble behaves as a newtonian liquid; (d) all the liquid initially behaves as a newtonian liquid and at some time transforms to a two-region liquid. Analytical expressions were derived for bubble growth as a function of dimensionless system parameters. The relevance of this work to the process of polymer devolatilization is discussed.