Preliminary investigation of micropumping based on electrical control of interfacial tension

Hirofumi Matsumoto*, James E. Colgate

*Corresponding author for this work

Research output: Contribution to conferencePaper

52 Scopus citations

Abstract

Electrical control of the interfacial tension between a liquid and solid (electrowetting) is studied as a means of microactuation for fluid systems, i.e., micropumping. Electrowetting provides a means of direct fluid pumping with no moving mechanical parts, which may prove useful in a number of application areas, such as micro chemical dispensers, injectors, and reactors, and even cooling systems for high-density microelectronics. A test device has been built (with silicon micromachining) for the study of electrowetting, and a detailed model of the devices is given. The model describes liquid flow in a small channel, as governed by Navier-Stokes equations, Laplace's equation, Young's equation, and Lippmann's equation. Simulation results presented indicate that electrowetting is a viable approach to microactuation: in a 10 μm radius channel, it may be used to generate pressures on the order of 0.01 MPa, comparable to pressures generated by existing micropump designs are order of magnitude larger in size. Although the dynamics of the test device are dominated by fluid friction, it is also shown that another micropump design, based on mercury, should behave as a nearly frictionless oscillator.

Original languageEnglish (US)
Pages105-110
Number of pages6
StatePublished - Dec 1 1990
EventProceedings - IEEE Micro Electro Mechanical Systems: An Investigation of Micro Structures, Sensors, Actuators, Machines and Robots - Napa Valley, CA, USA
Duration: Feb 11 1990Feb 14 1990

Other

OtherProceedings - IEEE Micro Electro Mechanical Systems: An Investigation of Micro Structures, Sensors, Actuators, Machines and Robots
CityNapa Valley, CA, USA
Period2/11/902/14/90

ASJC Scopus subject areas

  • Engineering(all)

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    Matsumoto, H., & Colgate, J. E. (1990). Preliminary investigation of micropumping based on electrical control of interfacial tension. 105-110. Paper presented at Proceedings - IEEE Micro Electro Mechanical Systems: An Investigation of Micro Structures, Sensors, Actuators, Machines and Robots, Napa Valley, CA, USA, .