The Study of the Effect of Surfactant on the Liquid Drop Motion In Fluid

Kazempour, Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52004 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar; Afshin, Hossein
  7. Abstract:
  8. The drop motion in fluid and the mass transfer is one of the most interesting and favorite topics that has attracted the attention of many researchers. Knowing the functions of the factors affecting the deformation and the process of mass transfer and the effects of the addition of the surfactant, improve the efficiency of the related industrial processes.In this regard, the present study examines how the shape and speed of a moving Newtonian drop in a Newtonian fluid, the mass transfer of soluble material from inside the drop to the surrounding fluid and also the study of the effect of surfactant on the dynamics of moving droplet is studied numerically. During the drop movement, the absorbed surfactant is swept from the fluid around the surface and accumulated in the bottom of the droplet. Thus, the distribution of surfactant concentrations on the surface of the droplet is not uniform, and the gradient of the concentration formed on the surface causes the stresses of the Marangoni to affect the hydrodynamic effect of the droplet. With a review of studies in this field and using computational fluid dynamics, to numerical modeling the effects of surfactants, the volume of fluid method has been used in OpenFOAM open source software.In this study, the effects of surfactant on the dynamics of a Newtonian drop, including deformation and its ascent speed, and comparison with pure drop have been investigated. The results show that with the addition of surfactant to the soluble field, the speed of rising of the drop decreases. Also, the deviation of the shape of the blank droplet from its initial spherical state is lower compared to pure droplets
  9. Keywords:
  10. Newtonian Liquid Drops ; Surfactants ; Drop Rising ; Deformation ; Newtonian Fluid Flow ; Mass Transfer ; Volume of Fluid

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