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Effects of Interfaces on Dynamics in Micro-fluidic Devices: Slip-boundaries' Impact on Rotation Characteristics of Polar Liquid Film Motors by Liu, Zhong-Qiang; Jiang, Su-Rong; Yinnon, Tamar A.; Kong, Xiang-Mu; Li, Ying-Jun is a scholarly article available to read on EtoBox.

What is Effects of Interfaces on Dynamics in Micro-fluidic Devices: Slip-boundaries' Impact on Rotation Characteristics of Polar Liquid Film Motors about?

Slip-boundary effects on the polar liquid film motor (PLFM) -- a novel micro-fluidic device with important implications for advancing knowledge on liquid micro-film's structure, dynamics, modeling and technology -- are studied. We develop a mathematical model, under slip boundary conditions, describing electro-hydro-dynamical rotations in the PLFMs induced either by direct current (DC) or alternating current (AC) fields. Our main results are: (i) rotation characteristics depend on the ratio $k=l_{s}/D$ ($l_{s}$ denotes the slip length, resulting from the interface's impact on the structure of the liquid and $D$ denotes the film's diameter). (ii) As $k$ ($k>-1/2$) increases: (a) PLFMs subsequently exhibit rotation characteristics under "negative-", "no-", "partial-" and "perfect-" slip boundary conditions; (b) the maximum value of the linear velocity of the steady rotating liquid film increases and its location approaches the film's border; (c) the decay of the angular velocities' dependency on the distance from the center of the film slows down, resulting in a macroscopic flow near the boundary. (iii) In addition to $k$, the rotation characteristics of the AC PLFM depend on the mag

Author

Liu, Zhong-Qiang; Jiang, Su-Rong; Yinnon, Tamar A.; Kong, Xiang-Mu; Li, Ying-Jun

Published

2014

Language

EN