Wasnik, Vishaka B
(2016)
Modeling of Electrothermal Flow Mixing in Lab on Chip
Microfluidic Devices.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Electrokinetics involves the study of liquid or particle motion under the action of an
electric field; it includes electroosmosis, electrophoresis, dielectrophoresis, and
electrowetting, etc. AC Electrokinetics
(ACEK) has attracted much research interest
for microfluidic manipulation for the last few years. It shows great potential for
functions such as micropumping, mixing and concentrating particles. Based upon
the actuation pattern microfluidic
-
based mixing
devices can be categorized in two
types. They are passive mixing microfluidic device and active mixing microfluidic
device. Passive mixers typically utilize geometrical advantages to enhance mixing
and they do not require external forces but a long mixing
path was required. Active
mixers are generally more effective than passive mixers. They utilize external
driving forces like acoustics vibrations, electric and magnetic instability,
temperature gradient due to joule heating etc. Like AC electroosmosis (AC
EO)
phenomena, AC electrothermal (ACET) effect is a hydrodynamic phenomena and
acts on a suspended particle only through fluid drag because of Joule Heating. The
challenges with ETE devices are the deciding threshold voltage, used for clinical
diagnostic t
o protect the cell from damage, choosing conductivity of the fluid,
Electrode patterning and the switching of the electrode.
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