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The Effect of Type, Size and Morphology of Nanoparticles on the Hydrodynamics of Rising Bubble Motion

Bastami, Mohammad Mahdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54757 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Dariush; Feizi, Pouyan
  7. Abstract:
  8. The motion of gas bubbles in the bulk of a fluid can be one of the most widely used industrial phenomena. Various factors such as the size and shape of the bubbles, the physical properties of the liquid phase such as density and viscosity, method of gas injection, the presence of impurities, etc. affect this phenomenon. Some of the most important industrial processes that include the motion of bubbles in the liquid phase bulk are gas adsorption, distillation and froth flotation. According to the results of previous studies, the hydrodynamics of bubble motion in the bulk of a liquid fluid depends on the presence of impurities such as surfactants, proteins and colloidal particles. In many cases, the presence of impurities, even in small concentrations, can cause significant changes in surface properties such as surface tension and parameters such as friction drag coefficient. Under such conditions, the hydrodynamic behavior of the bubble motion and the whole process is affected. Recently, the use of nanoparticles as the most important colloidal particles has attracted the attention of many researchers in multiphase systems. The presence of nanoparticles in systems that include a fluid-fluid interface changes the interface state from a liquid to a pseudo-solid state. This phenomenon can change the hydrodynamic behavior of the bubble. Therefore, the study of the effect of different nanoparticles on bubble motion is a valuable fundamental achievement that can be considered in industrial systems. One of the common methods for measuring the hydrodynamic parameters in bubble motion in bulk of a liquid is the rising bubble method, which has been used many times by researchers and the results have been cited in various texts. Therefore, investigating the effect of type, size and morphology of nanoparticles on the hydrodynamics of bubble motion using the rising bubble method is a new idea that is proposed in this project. Calcium carbonate nanoparticles, spherical zinc oxide and rod zinc oxide will be used in this project.
  9. Keywords:
  10. Hydrodynamics ; Nanoparticles ; Gas Bubbles ; Bubble Size

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