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Modeling and Analysis of Cylindrical Swellable Elastomers

Namdar, Amir Hossein | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52913 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani Hadi, Jamal
  7. Abstract:
  8. When swellable elastomer are surrounded by suitable fluid, they absorb the fluid and swell. This capability is used to design different tools. For example, drug release devises, sensors and actuators, in microfluidic devises such as micro-valves and micro-mixers, and seal devises. Most of these devises are shaped cylindrically. Therefore, have a thorough knowledge about how cylindrical swellable elastomer behavior, give us a good vision about how to design such actuators. In this thesis we have used constitutive equation of such materials and have investigated behavior of cylindrical swellable elastomers analytically and numerically. Analytical investigation is focused of transient behavior of the material. And for cases that boundary conditions were complicated we have used numerical methods. In numerical investigation only equilibrium state is considered. For analytical investigation, we have considered swelling and drying of elastomers. We have shown that these two mechanism are different and drying happens much faster for considered material parameters. Also FG material is considered and the differences in swelling and drying investigated. For numerical case, leakage of a seal and imperfectionity in channel were considered and investigated
  9. Keywords:
  10. Microvalve ; Swelling Kinetics ; Functionally Graded Materials (FGM) ; Swellable Elastomer ; Leakage

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