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Experimental Investigation on the Accelerated Motion of Newtonian and Non-Newtonian Liquid Drops

Aminzadeh, Milad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43111 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar; Afshin, Hossein
  7. Abstract:
  8. Motion of liquid drops into another fluid is of central importance in a variety of most commonly used industries. Vast applications of emulsions in food and drug industries as well as using of drops in liquid-liquid extraction processes and direct contact heat exchangers are examples in which dynamics of motion of drops play a significant role in operation and efficiency.
    In present study, we consider the accelerated motion of Newtonian and non-Newtonian liquid drops experimentally. In order to find the effect of bulk fluid on the motion of drops, air and water are used as bulk fluid. The experiments have been done on Water, Ethanol, Ethyl acetate, n-Hexane and Toluene as Newtonian and two different solutions of CMC in water and polystyrene in toluene as non-Newtonian drops. Using a high speed camera as well as an image process code, 1) volume of drops, 2) position, velocity and acceleration of drops 3) drag coefficient 4) size oscillation and 5) non-Newtonian liquid drops are studied. Also, some theoretical correlations are presented which have a good consistency with experimental results in the case of Newtonian drops. In contrary, they have significant errors in the case of non-Newtonian drops. In addition, observed that by increasing density and viscosity of bulk fluid, the Newtonian and non-Newtonian liquid drops show similar behaviors.
    In order to consider the interaction among drops and their mutual effect on the motion of each other, we study motion of a sequence of drops rising in water and compare the behavior of a single drop moving lonely with a particular drop in sequence. In this case, results show that Newtonian and non-Newtonian drops have different behaviors
  9. Keywords:
  10. Image Processing ; Drag Coefficient ; Newtonian Liquid Drops ; Drop Deformation ; Draps Sequence ; Nonnewtonian Liquid Drops

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