Numerical modeling of electrowetting transport processes in digital microfluidics

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Journal titleMicrofluidics and Nanofluidics
Pages599608; # of pages: 10
SubjectLattice Boltzmann method; Shan-Chen mesoscopic potential; Hele-Shaw cells; Electrowetting; Digital microfluidics
AbstractElectrical actuation and control of liquiddroplets in Hele-Shaw cells have significant importance for microfluidics and lab-on-chip devices. Numerical modeling of complex physical phenomena like contact line dynamics, dynamic contact angles or contact angle hysteresis involved in these processes do challenge in a significant manner classical numerical approaches based on macroscopic Navier–Stokes partial differential equations. In this paper, we analyze the efficiency of a numerical lattice Boltzmann model to simulate basic transport operations of sub-millimeter liquid droplets in electrowetting actuated Hele-Shaw cells. We use a two-phase three-dimensional D3Q19 lattice Boltzmann scheme driven by a Shan–Chentype mesoscopic potential in order to simulate the gas– liquid equilibrium state of a liquid droplet confined between two solid plates. The contact angles at the liquid– solid–gas interface are simulated by taking into consideration the interaction between fluid particles and solid nodes. The electrodes are designed as regions of tunable wettability on the bottom plate and the contact angles adjusted by changing the interaction strength of the liquid with these regions. The transport velocities obtained with this approach are compared to predictions from analytical models and very good agreement is obtained.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number52485
NPARC number16001654
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Record identifierd82dbe03-0e4b-438d-9948-2f326fe1a61f
Record created2010-08-30
Record modified2016-05-09
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