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Experimental Study of Droplet Formation in Surfactant Solution

Niknezhad, Mahdi | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50062 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar; Afshin, Hossein
  7. Abstract:
  8. Surfactants are materials that reduces surface tension, and this property has provided a wide range of applications for them. Most of the surfactants reduce surface tensions at the interface of two fluids. The pharmaceutical and food industries, detergents, cosmetics, agricultural pesticides, dye production and oil extraction are among these applications.In this study, the formation of droplets in the presence of three types of surfactants SDS, CTAB and Tween 20 has been investigated. To evaluate the droplet behavior in the presence of specific surfactants, various parameters such as formation time of the droplet, the diameter and length of the droplet formed, the diameter and length of the necking region and the contact angle have been studied. The presence of surfactant in the droplet formation process decreases the droplet formation time, the diameter of the droplet formed and the diameter of the necking region and increases the parameters such as the length of the droplet and the length of necking region. Addition of surfactant, especially in the case of two SDS and CTAB, also changes the contact angle pattern.The results of our experiment indicate that two types of SDS and CTAB surfactants have the same effect on the variables studied, but the Tween 20 produces less variation on the forming droplet. In the case of the behavioral difference between two SDS and CTAB surfactants with Tween 20, the influence of parameters such as molecular weight, ionic structure and molecular structure of surfactant can be mentioned. In the case of satellite droplets, it can be said that in the presence of the CTAB surfactant, larger droplets form in comparison to two other surfactants, and as the satellite droplet size increases, spherical shape formed to a drop drawn in the direction of the formation of a droplet.
  9. Keywords:
  10. Surfactants ; Experimental Studies ; Contact Angle ; Newtonian Liquid Drops ; Droplet Formation ; Drop Shape ; Necking Region

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