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Non-equilibrium Interfacial Properties of Dynamic Interfaces; Experimental and Computational Fluid Dynamic Investigations

Lotfi, Marzieh | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47990 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh; Miller, Reinhard; Javadi, Aliyar
  7. Abstract:
  8. Surface phenomena and dynamic Interfacial properties play an important role in gas- liquid and liquid-liquid multiphase process from various industrial applications to understand fundamental phenomena. However, there is no experimental equipment and efficient methods for quantitative and detail investigation of interfacial properties under fast and non-equilibrium dynamic condition due to mobility and refreshing of interface (such as rising bubble). Also existing models accompanied with a lot of simplifications which is not yet validated with a proper experimental data. In presented thesis work for the first time, quantitative study of dynamic adsorption layer in multiphase systems and more detail investigation of common theories became possible with presenting a new experimental method " bubble in flow field" which is developed base on existing experimental equipment of measuring momentary capillary pressure. Study of dynamic adsorption layer of rising bubble with innovative experimental technique "bubble in flow field" has revealed new details that models of socalled" dynamic adsorption layer-DAL" needs to be seriously revised. Also one of novel experimental achievements in this thesis, could be observation of significant changes of protein adsorption kinetic in presence of a little bit of non ionic surfactant. Moreover qualitative notions regarding this phenomena have been validated by proposed modeling. In addition new theories at large Reynolds number has been developed for calculation of adsorption dynamic parameter base on experimental behavior of rising bubble. Also dynamic simulation with development of a special code is performed for more detail investigation of dynamic behavior of rising bubble and effect of adsorption dynamic parameter which results is in a good agreement with experiments. Also challenging issue of "diffusion control" or "Kinetic control" of surfactant adsorption at non-equilibrium condition is investigated by results of new technique and provided analytical model
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Surfactants ; Interfaces ; Interfacial Phenomena ; Capillary Pressure ; Adsorption Dynamic ; Rising Bubble ; Bubble in Flow Field

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