Influence of unsteady mass transfer on dynamics of rising and sinking droplet in water: Experimental and CFD study

TY - JOUR

T1 - Influence of unsteady mass transfer on dynamics of rising and sinking droplet in water

T2 - Experimental and CFD study

AU - Rao, Abhijit

AU - Reddy, Rupesh K.

AU - Valsaraj, Kalliat T.

AU - Nandakumar, Krishnaswamy

AU - Pandey, Shashank

AU - Wu, Chunliang

N1 - Publisher Copyright: © 2014 American Institute of Chemical Engineers.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Experimental and numerical investigations were conducted to study the effect of unsteady mass transfer on the dynamics of an organic droplet released in quiescent water. The situation is important and relevant to deep sea oil spill scenario. The droplet contains two components, one is heavier (immiscible) than water and other is lighter (miscible). When released, with an initial mixture density (890-975 kg/m3) lower than that of surrounding water, droplet rises in the column. The mass transfer of lighter solute component into water causes the droplet density to increase and droplet sinks when the density exceeds that of water. A mass-transfer correlation accounting for the loss of the solute, based on Reynolds, Grashoff, and Schmidt numbers was developed. A two-dimensional axisymmetric Computational Fluid Dynamics (CFD) model accounting for species transport was developed to emulate the experimental observations. The study also helped in identifying dominant mass-transfer mechanisms during different stages of droplet motion.

AB - Experimental and numerical investigations were conducted to study the effect of unsteady mass transfer on the dynamics of an organic droplet released in quiescent water. The situation is important and relevant to deep sea oil spill scenario. The droplet contains two components, one is heavier (immiscible) than water and other is lighter (miscible). When released, with an initial mixture density (890-975 kg/m3) lower than that of surrounding water, droplet rises in the column. The mass transfer of lighter solute component into water causes the droplet density to increase and droplet sinks when the density exceeds that of water. A mass-transfer correlation accounting for the loss of the solute, based on Reynolds, Grashoff, and Schmidt numbers was developed. A two-dimensional axisymmetric Computational Fluid Dynamics (CFD) model accounting for species transport was developed to emulate the experimental observations. The study also helped in identifying dominant mass-transfer mechanisms during different stages of droplet motion.

KW - Computational fluid dynamics

KW - Droplet dynamics

KW - Mass-transfer coefficient

KW - Transport processes

KW - Unsteady mass transfer

KW - Volume of fluid

UR - http://www.scopus.com/inward/record.url?scp=84920025959&partnerID=8YFLogxK

U2 - 10.1002/aic.14612

DO - 10.1002/aic.14612

M3 - 文章

AN - SCOPUS:84920025959

SN - 0001-1541

VL - 61

SP - 342

EP - 354

JO - AICHE Journal

JF - AICHE Journal

IS - 1

ER -