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Investigation of Effect of the Initial Bubble Shape on Rising Bubble Behaviour

Ghamangiz Khararodi, Mohammad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48799 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh
  7. Abstract:
  8. In this experimental work terminal velocity, velocity profile and aspect ratio of bubble with 1.49 mm diameter which ascend in pure water and infected by surfactant nonionic C10DMPO and surfactant ionic SDS in regime that surface tension is dominant, have been considered. Observations showed that with respect to entering nozzle, bubbles with this diameter have two initial stable shape; spherical and extended form on surface for horizontal needle and vertical nozzle. Results are (1) Bubbles with initial spherical shape had lower terminal velocity and higher aspect ratio with respect to bubbles with initial extended form, (2) Spherical bubble had aspect ratio about 1 at whole bubble column i.e. bubble preserve its initial shape, where for bubbles with extended form in acceleration section aspect ratio decreased and became its minimum when terminal velocity occurred, (3) Cause of dispersion of terminal velocity wasn’t the concentration of surfactant but was initial shape of bubble, (4) it seems that surfactant role was to decrease extent of bubble surface, therefore a bubble infected by surfactant acts like a clean bubble with initial spherical shape. Therefore we can conclude in addition to DAL theory, we found another consideration of effects of surfactant on bubble movement
  9. Keywords:
  10. Aspect Ratio ; Air Bubble ; Rising Bubble ; Bubble Initial Shape ; Limit Velocity ; Surfactants ; Ionic Surfactant

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