Chapter

Bubbly Flows

Part of the series Heat and Mass Transfer pp 159-174

Direct numerical simulation of mass transfer between rising gas bubbles and water

  • D. BotheAffiliated withTechnische Chemie, Universität Paderborn
  • , M. KoebeAffiliated withTechnische Chemie, Universität Paderborn
  • , K. WielageAffiliated withTechnische Chemie, Universität PaderbornPaderborn Center for Parallel Computing, Universität Paderborn
  • , J. PrüssAffiliated withTechnische Chemie, Universität PaderbornInstitut für Analysis, Martin-Luther Universität Halle-Wittenberg
  • , H.-J. WarneckeAffiliated withTechnische Chemie, Universität Paderborn

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Abstract

This paper presents numerical simulations of two-phase flow with high-density ratio, taking into account mass transport of a soluble component and its interfacial mass transfer. The mathematical model and the numerical method allow for different solubility of the species in the respective fluid phases, while volume changes due to mass transfer a reneglected. The discontinuous changes in species concentration sat the interface are modeled by means of Henry’s law. Simulations are carried out with a next ended version of the highly parallelized code FS3D, which employs an advanced Volume-Of-Fluid(VOF) method. For the examination of mass transfer, single bubbles are held in counter-flow to investigate the transient dissolution of a dilute species. In case of small bubbles with laminar wake a rotational symmetric concentration profile occurs, in agreement with theoretical considerations, while the local mass concentrations in the wake of larger bubbles show complex patterns of varying concentration as it also has been recently observed experimentally.