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NUMERICAL UNDERSTANDING OF μ TAS

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dc.contributor.author Pal, Subhamoy
dc.date.accessioned 2024-12-04T10:46:32Z
dc.date.available 2024-12-04T10:46:32Z
dc.date.issued 2018-05
dc.identifier.uri http://localhost:8081/xmlui/handle/123456789/16001
dc.description.abstract Common feature of μTAS is impact on a droplet on a microfluidic channel for functional analysis. It has been observed that both hydrophilic and hydrophobic nature has their usual applications but shifting of wetting mode is also important for μTAS. One such mode of wetting mode shifted is electrowetting. In the present study droplet impact using electrowetting has been studied numerically. A coupled electro hydrodynamic model is used to explore the phenomenon of droplet impact on a charged surface. The spatio-temporal electric field is obtained from the solution to Poisson and charge conservation equation. The electrostatic forces are coupled with hydrodynamics by incorporation of Maxwell stress term of the two-phase momentum equation. Geometry of the foot print of the charged region is varied to control the contact line mobility. The electrical stress generated near the three phase contact-line due to the presence of electric field constrains its motion in the desired direction and causes a change of impact behavior. It can be observed that a hydrophilic surface shows hydrophobic characteristics when the droplet is collided with it at a concentric ring shaped charged regions. As the phenomenon is mainly governed by the interplay between electrostatic, capillary and inertia forces it is explored through the parametric variation of applied voltage as well as parametric variation of contact angle and impact height. It has been observed that the application of voltage can change hydrophilic surface into a bouncing hydrophobic one for application of μTAS. The outcome of the present study can be utilized to develop a vast range of engineering surfaces for various applications like drop wise condensation, anti-corrosion and self- cleaning and microfluidics. en_US
dc.description.sponsorship INDIAN INSTITUTE OF TECHNOLOGY ROORKEE en_US
dc.language.iso en en_US
dc.publisher I I T ROORKEE en_US
dc.subject Common Feature of μTAS en_US
dc.subject Coupled Electro Hydrodynamic en_US
dc.subject Momentum Equation en_US
dc.subject Geometry en_US
dc.title NUMERICAL UNDERSTANDING OF μ TAS en_US
dc.type Other en_US


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