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Molecular Dynamics Simulation of Electroosmotic Flow in Nano scales

Zakeri, Ramin | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40397 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Due to important applications and benefits of mass transfer in engineering and especially in nano-scales engineering, nano-science researchers have focused on this field. Considerably, in classical fluid dynamics applications, the fluid can be transported using differential pressure gradient. But the classical methods require moving components, which are usually expensive and not applicable in nano-sizes. To avoid these problems in nano-size transportation, we can use electro-osmotic process to perform mass transfer in low transfer rates. In electro-osmotic process, we can move electrolyte solvent with the aid of an external electrical field. Due to importance of this process in nano-science, we use dissipative particle dynamics (DPD) method to investigate electro-osmotic process in this research. Most of the past researches conducted in this field had assumed that the fluid is continuum and newtonian. In this research, we consider real physics of nano-fluids and simulate electro-osmotic flow in nano-channels. We extend our simulation to non-newtonian fluids in order to obtain wider range of application and novelty. In simulating newtonian fluids in nano-channels, we show that there are effective parameters which we can wisely adjust them to gain a precise control over electro-osmotic fluids and increase or decrease the mass flow rate. In simulating the non-newtonian electro-osmotic flow in nano-chanels, we parameterize the important factors on the non-newtonian electro-osmotic flow and show that there are regions where the mean speed for newtonian and non-newtonian fluids are very close to each other, while the difference is quite considerable outside of these regions. The presence of polymer chains in working fluids of a nano-electro-osmotic system can be very beneficial for industrial process. Therefore, we perform the simulation of polymer chains with DPD in case of Poiseuille and electro-osmotic flows. We show that the transfer of polymer chain in electro-osmotic mode has lower dispersion which is much more suitable.

  9. Keywords:
  10. Non-Newtonian Flow ; Polymer Chain ; Newtonian Fluid Flow ; Nano Electroosmatic Flow

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