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Numerical Study of Induced-charge Electroosmotic (ICEO)Flow Effects on Mixing Phenomena in a Porous Media, Using Lattice Boltzmann Method

Shahriari Darabad, Zahra | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56398 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi Rahni, Mohammad; Salimi, Mohammad Reza
  7. Abstract:
  8. Rapid preparation of a homogeneous mixture is essential for many chemical and biological applications, such as micro-scale biological-chemical agent detection, drug delivery, and DNA hybridization. Some mixing systems have a micro-scale geometry, which results in a very slow mixing process, mainly due to laminar flow in these systems. Mixing in a slow flow is performed only by molecular diffusion. In the absence of any disturbances, increased mixing is not possible simply by diffusion. Accordingly, a suitable and innovative method to improve mixing for such systems is required. Induced charge electro-osmosis is a new field of electro-osmotic flow, which performs better than conventional hydrodynamic methods in small scales. In the present study, mixing of two fluids in a two-dimensional T-shaped microchannel, which has a mixing chamber containing a Sierpinski carpet porous media, was studied numerically at the scale of the pores. The parameters affecting mixing, including the intensity of the applied electric fields, the angle of the porous media in the mixing chamber, the number of repetitions, and the geometry of the pores were studied and reported. In this research, contrary to the previous researches, the pumping and the mixing of flows were done only by using the induced charge electro-osmotic phenomenon. The electric potential field was simulated using finite volume method (FVM) and the flow and the concentration fields were simulated using lattice Boltzmann method (LBM). The triangular conductive obstacles under the influence of uniform external electric fields caused the flow pumping. The effects of the number of obstacles and the intensity of the applied electric field were investigated. According to the results, increasing the intensity of the electric field and the number of obstacles cause an increase in the mass flow rate and the Reynolds number of the flow in the microchannel. Moreover, the most optimal geometry for mixing and pumping of fluids in this research is the porous medium with squared pores with a repetition order of 3 with a mixing efficiency of 94.3% in the outlet section
  9. Keywords:
  10. Mixing Fluids ; Finite Volume Method ; Lattice Boltzmann Method ; Electroosmotic Flow ; Sierpinski Carpet Porous Medium ; Induced Charge Electro Osmosis (ICEO)

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