final presentation_shashwat
TRANSCRIPT
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Prediction of Current Drop in High Power Electro-Osmotic Pumps
Mena Tawfik, Thomas Hansen, Shashwat Gupta, Anirudh Thuppul, F.J. DiezDecember 2015
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INTRODUCTION• Problem: Observed current drop when
a DC voltage is applied across an EO pump.
• Goal: To predict the current drop using a theoretical model.
• Tools used: a) Advection diffusion equation to
predict ion transportation.b) Superposition of diffusion limited
current and ion migration limited current
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EXPERIMENTAL SETUP
A 3D model of the EO pump housing Sketch showing the experimental setup used
Reservoir
Precision Scale
Reservoir
Function Generator
Amplifier
Flow meter
PCMicroscopeCamera
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ADVECTION DIFFUSION THEORY
Advection-Diffusion Equation (Ogata & Banks Solution) Diffusion equation (Cottrell solution)
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TRANSIENT CURRENT
Transient current (comparison between theoretical and experimental current) without membrane.
Experimental current drop without membrane
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CHALLENGES• To predict the current drop with the membrane.
• To find theoretical resistance of the porous membrane.
• Match the theoretical resistance with the experimental values.
• A hypothesis has been introduced for the inclusion of membrane effects in the transient current.
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HYPOTHESIS• With the membrane in consideration, the total
current will be:I (total) =
• Now, let V (total) = V eff/electrolyte + Vmembrane. (1)
• Also, V (total) = I (total) R(total) = ((V
eff/electrolyte / Relectrolyte) + (Vmembrane/ Rmembrane)) (2)
• From (1) and (2), we find V eff/electrolyte and Vmembrane.
lfhjR(electrolyte) R (membrane)
+
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FUTURE WORK• Test the hypothesis experimentally.
• Determination of theoretical resistance of the porous membrane.
• Combine all the work into a holistic theory.