مقاله Simulation of mixed electroosmotic/pressure-driven flows by utilizing dissipative particle dynamics : تی پی بین

خلاصه مقاله

In this paper, we present an extension of dissipative particle dynamics method in order to study the mixed electroosmotic/pressure-driven micro- or nano-flows. This method is based on the Poisson–Boltzmann equation and has a great potential to resolve the electric double layer (EDL). Hence, apart from studying the bulk flow, it also provides a strong capability in order to resolve the complex phenomena occur inside the EDL. We utilize the proposed method to study the pure electroosmotic and also the mixed electroosmotic/pressure-driven flow through the straight micro-/nano-channels. The obtained results are in good agreement with the available analytical solutions. Furthermore, we study the electroosmotic flow and motion of DNA molecules through a T-shaped micro-channel. We show that neglecting the EDL and utilizing the slip wall boundary condition model can result in crucially misleading hydrodynamic characteristics if the EDL is comparable to the width of the channel. Finally, we utilize the presented method in order to study the complex flow patterns, which are created due to the heterogeneous distribution of the electric potential of the walls. These complex flow patterns usually are utilized in order to enhance the efficiency of mixing process in micro-/nano-length scales. In addition, we show that they can also be utilized effectively in order to separate the different macro-molecules such as polymers, DNA molecules and so on, according to their length of chain.

نویسندگان

Aryan Mehboudi [ Department of Mechanical Engineering, Center of Excellence in Energy Conversion, Sharif University of Technology, Tehran, Iran ]

Mahdieh Noruzitabar [ Bushehr University of Medical Sciences, Bushehr, Iran ]

Masoumeh Mehboudi [ Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran ]

کلمات کلیدی

Mixed electroosmotic/pressure driven flow Electric double layer Dissipative particle dynamics MEMS NEMS DNA molecular sieving

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Microfluidics and Nanofluidics 2013

Microfluidics and Nanofluidics is an international peer reviewed journal exploring all aspects of microfluidics, nanofluidics, and lab-on-a-chip science and technology. The journal seeks to improve the fundamental understanding of microfluidic and nanofluidic processes, examining the current state of research and development and the latest applications. This journal broadly interprets microfluidics and nanofluidics as the study of mass (including molecular and colloidal) and momentum transfer, heat transfer, and reactive processes, coupled with transport in microscale and nanoscale systems. Readers will find reports of original scientific research, techniques, and applications. In addition, the journal publishes brief communications presenting urgent announcements of significant advances or preliminary accounts of new work and topical reviews summarizing accepted practices and reporting progress in selected areas.

حوزه های تحت پوشش : Engineering Fluid Dynamics, Biomedical Engineering, Analytical Chemistry, Nanotechnology and Microengineering