GCRIS

Accurate characterization of fluid transport in micro/nano confinements is essential for numerous applications from industrial, agricultural, and medical sciences. In these applications, electrokinetic interactions dominate the fluid behavior, which causes conventional fluid dynamics to become incomplete. Specifically, near-wall hydrodynamics and liquid/solid coupling at the interface varies by electrokinetic effects. Therefore, the current study focuses on characterization of the fluid transport at various porous systems and ionic conditions. The Poisson-Nernst-Planck (PNP) equations were numerically solved coupled with the Navier-Stokes (NS) equations. Charge regulation (CR) boundary condition is employed to calculate the charging behavior of the surfaces. First, the surface charging of nano-scale systems was analyzed by considering the electric double layer (EDL) overlap and inlet/outlet effects. While EDL overlap decreased the surface charge, inlet/outlet effects presented an opposite behavior. Then, transport is characterized by calculating the hydraulic conductivity from Darcy's law under electrokinetic and boundary slip effects. The results showed that electrokinetic effects decrease the hydraulic conductivity with increasing concentrations and decreasing confinement sizes. At slipping condition with a constant slip length applied, velocity slip developing on surface showed strong dependence on porosity and ionic conditions. For low porosities and high concentrations almost no-slip conditions were observed even at high slip lengths. Results showed that the transport in micro/nano-scale porous systems is dominated by electrokinetic interactions depending on porous system parameters and ionic conditions.

Phd Degree / Doktora

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