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The dynamics of wettability driven droplets in smooth and corrugated microchannels

Esmaili, E ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1088/1742-5468/2012/10/P10005
  3. Publisher: IOP , 2012
  4. Abstract:
  5. A multi-component lattice Boltzmann scheme is used to investigate the dynamics of a wettability driven droplet within a microchannel. The driving force for the motion is created by a stepwise change in the wettability of the channel walls. Moreover, an analytical solution is developed for evaluation of the dynamics of the droplet inside the channel. The effects of various parameters such as the height of the channel, the wetting pattern of the channel walls, the viscosity and the density ratio on the dynamics are studied. Also, the effect of grooves of different sizes on the channel surfaces on the dynamics of the droplet is investigated for both hydrophilic and hydrophobic surfaces. Finally, the effect of an obstacle in the channel on the motion of the droplet is studied. The numerical results are compared with the analytical solutions and close agreement between the results is found
  6. Keywords:
  7. Fluids in confined geometries ; Interfacial phenomena and wetting ; Lattice Boltzmann methods ; Microuidics and nanouidics (theory)
  8. Source: Journal of Statistical Mechanics: Theory and Experiment ; Volume 2012, Issue 10 , 2012 ; 17425468 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/1742-5468/2012/10/P10005/meta;jsessionid=B5331DC8FEE4B2F8EC4986D9CA42035D.c2.iopscience.cld.iop.org