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Simulating of Droplet Formation and Calculation of Interfacial Tension by Microfluidic Method

Ghanavati, Ashkan | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55504 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Mohammadi, Ali Asghar
  7. Abstract:
  8. Emulsions are the intermittent dispersion of liquid droplets that have many applications such as polymerization, dyeing, cosmetics, food industry, etc. Droplets can be created in a variety of ways, but the most important point in emulsification and the greatest efficiency of its applications is when the formed droplets are uniform. In the emulsification process, there is a key parameter called interfacial tension, which affects the behavior of the formed droplets, such as their stability and morphology, and its precise measurement is very effective in the quality control of the mentioned applications. Be. In this research, droplet formation in microfluidic systems due to uniform droplet formation using Comsol software has been simulated. Parameters such as continuous and dispersed phase flow, viscosity, interfacial tension and channel dimensions that affect the droplet size have been investigated. As a result, the parameters affecting the droplet size depend on the capillary number based on the continuous phase. Finally, the interfacial tension is calculated using a cheap and easy method based on the force balance in microfluidic systems. The interfacial tension error calculated in this method is less than 4% with the value set in Comsol software.

  9. Keywords:
  10. Droplet Formation ; Simulation ; Interfacial Tension ; Computational Fluid Dynamics (CFD) ; Microfluidic System ; Microfluidics Droplet Generation

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