World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Physics of Fluids : Mixing enhancement in electro-osmotic flows via modulation of electric fields

By J. R. Pacheco

Click here to view

Book Id: WPLBN0002169598
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 5 September 2008

Title: Physics of Fluids : Mixing enhancement in electro-osmotic flows via modulation of electric fields  
Author: J. R. Pacheco
Volume: Issue : September 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Fluids Collection
Historic
Publication Date:
Publisher: American Institute of Physics

Citation

APA MLA Chicago

Pacheco, J. R. (n.d.). Physics of Fluids : Mixing enhancement in electro-osmotic flows via modulation of electric fields. Retrieved from http://hawaiilibrary.net/


Description
Description: The mixing of a passive tracer in a three-dimensional rectangular microchannel is studied numerically. A time-dependent electric field across a microchannel, filled with an electrolyte solution, is applied in order to realize a well-mixed state. Random perturbations to a time-periodic electric field are introduced in order to break the invariant tori of the system and to attain better mixing results. Two types of nonperiodic protocols are used to generate chaotic mixing by modulating the transverse electric field. In each case the quality of mixing is quantified with Lyapunov exponents for nondiffusive tracers and variance in concentration for diffusive tracers. The numerical results suggest that when the Lyapunov exponent is properly scaled, its probability density function measured over various numbers of periods has the same geometrical structure. It was also found that the variance in the concentration of the passive scalar exhibits an exponential decay. For the modulated and periodic systems considered in this investigation, its evolution curves exhibited self-similarity when plotted versus the product of the nondimensional time and the mean Lyapunov exponent of the flow. As the axial flow in this study varies only inside the Debye layer, and the tracers were introduced into the middle pluglike region of the flow, it was found that Taylor dispersion effects are more pronounced for flows (at least in their early stages) with effective mixing in the cross section.

 

Click To View

Additional Books


  • Review of Scientific Instruments : Near ... Volume Issue : December 2008 (by )
  • The Journal of Chemical Physics : Monte ... Volume Issue : November 2008 (by )
  • Applied Physics Letters : Probing antiph... Volume Issue : December 2008 (by )
  • Biblioteca Hispanica : Elementary Natura... (by )
  • Review of Scientific Instruments : Polar... Volume Issue : December 2008 (by )
  • Chaos : Coherence resonance induced by c... Volume Issue : November 2008 (by )
  • Journal of Applied Physics : Quasi-in-pl... Volume Issue : November 2008 (by )
  • Review of Scientific Instruments : Fabri... Volume Issue : December 2008 (by )
  • Physics of Plasmas : Pitch angle scatter... Volume Issue : November 2008 (by )
  • Applied Physics Letters : Chemical patte... Volume Issue : December 2008 (by )
  • Journal of Applied Physics : Extrusion f... Volume Issue : November 2008 (by )
  • Physics of Plasmas : Toroidal self-consi... Volume Issue : November 2008 (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.