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Electrohydrodynamics of stationary mesoscale droplets for applications in fluid properties measurement and lab-on-chip devices
Memon, Faisal Bilal
Memon, Faisal Bilal
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2021-12
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Electronic dissertations
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Abstract
Current fluid properties testing methods are bulky and property specific. They can be
improved by implementing an all-in-one integrated lab on a chip device, that employs the
principles of electrohydrodynamics. Current approaches of using droplet electrohydrodynamics
for fluid properties testing are reviewed, providing a proof of concept for our proposed multiproperty
sensing integrated device. Current approaches of mathematical modeling and simulations
are also reviewed, providing a template to design our own simulations. Using syringe needles, a
pair of mesoscale droplets are actuated using DC voltage for droplet electrocoalescence and
varying AC voltage frequencies for droplet oscillations. Simulations for droplet electrocoalescence
were also performed using COMSOLTM MultiPhysics® 5.4 simulation software, and the results
validated against experimental data. The following droplet electrocoalescence phenomena were
investigated with the aid of experiment and simulation data: coalescence time, critical conditions
for coalescence, droplet bridge growth, and progression of electric field strength. The following
droplet oscillations phenomena were investigated with the aid of experiment data: droplet
deformation hysteresis plots for low AC voltage frequency operation, and frequency response of
different fluids under AC voltage actuation. It is found that there is a non-linear relationship
between applied electric field and coalescence time for droplets of various sizes. Furthermore, at
low applied AC voltage frequency, droplet oscillation behavior is quasistatic, at resonant
frequency, droplet displacement amplitude is very high, and at frequencies above resonant
frequency, displacement amplitude reduces, and a phase lag is introduced.
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Thesis (M.S.)-- Wichita State University, College of Engineering, Dept. of Mechanical Engineering
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Wichita State University
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© Copyright 2021 by Faisal Bilal Memon
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