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RESEARCH PAPERS: Electrical Effects at the Macro and Micro Scale

Optimization of High Flow Rate Nanoporous Electroosmotic Pump

[+] Author and Article Information
Y. Berrouche, Y. Avenas, C. Schaeffer

 Grenoble Institute of Technology, 38402 Saint-Martin-d’Hères Cedex, Grenoble, Isère 38402, France

P. Wang, H.-C. Chang

 University of Notre Dame, Notre Dame, IN 46556

J. Fluids Eng 130(8), 081604 (Jul 31, 2008) (7 pages) doi:10.1115/1.2956609 History: Received July 16, 2007; Revised December 17, 2007; Published July 31, 2008

We present a theory for optimizing the thermodynamic efficiency of an electroosmotic (EO) pump with a large surface area highly charged nanoporous silica disk substrate. It was found that the optimum thermodynamic efficiency depends on the temperature, the silica zeta potential, the viscosity, the permittivity, the ion valency, the tortuosity of the nanoporous silica but mainly the effective normalized pore radius of the substrate scaled with respect to the Debye length. Using de-ionized water as the pumping liquid, the optimized EO pump generates a maximum flow rate of 13.6mlmin at a pressure of 2kPa under an applied voltage of 150V. The power consumed by the pump is less than 0. 4W. The EO pump was designed to eliminate any bubble in the hydraulic circuit such that the pump can be operated continuously without significant degradation in the performance.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of EDL

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Figure 2

The EO pumping in a capillary

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Figure 3

The velocity profile u(r) in a capillary of radius a for different values of the pressure drop (ΔP=ΔP1, ΔP=ΔP1∕2, and ΔP=ΔP1∕5, ΔP1 are the given pressure drops less than ΔPm).

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Figure 5

Influence of the valance number (a), and the Zeta potential (b) on the optimum thermodynamic efficiency for an effective normalized pore radius of 4.

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Figure 4

The variation of the normalized inner potential profile for different values of the Debye length.

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Figure 6

The variation of the optimum efficiency in function of the normalized pore radius aeff*

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Figure 7

The Schematic of the porous EO pump

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Figure 8

The design of the porous EO pump

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Figure 9

Measurement setup

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Figure 10

Performance curves for the EO pump showing max flow rate versus max pumping pressure for different operating voltages. The pumping liquid is DI water.

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Figure 11

Q-P diagram for EK pumps

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Figure 12

The variation of the thermodynamic efficiency for various normalized pore radius

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