Micro Electro Kinetic Actuator (MEKA) arrays for active sublayer control of turbulent boundary layers

Francisco J. Diez, Werner Dahm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Recent progress is summarized in the development of microactuator arrays that function on the electrokinetic principle to permit active control of streamwise sublayer vortical structures in turbulent boundary layers. Electrokinetic microactuator arrays induce volume displacement in the sublayer by electrokinetic pumping under an impulsively applied electric field. Individual microchannels are formed in a substrate and filed with a 1 μm-scale doped porous polymer matrix material that provides the required ζ-potential when wetted by the corresponding electrolyte. The resulting microactuator arrays have many characteristics that make them potentially suited for practical sublayer control on full-scale aeronautical and hydronautical vehicles. Essentially loss-less frequency response has been demonstrated to 10 kHz. Several such micro electrokinetic actuator (MEKA) arrays have been fabricated from a three-layer design leading to the MEKA-5 full-scale hydronautical array, composed of 25,600 individual electrokinetic microactuators with 350 um center-to-center spacings, arranged in a 40 x 40 pattern of unit cells, each composed of a 4 x 4 matrix of actuators; this array was successfully fabricated in a 7 x 7 cm2 tile in 250 um thick mylar substrate material. MEMS design and fabrication processes were used to produce a top layer for the MEKA-5 hydronautical- scale array; the functionality incorporated in this top layer fabrication demonstrates the complete elements needed for microscale electrokinetic actuator arrays for sublayer control.

Original languageEnglish (US)
Title of host publication40th AIAA Aerospace Sciences Meeting and Exhibit
StatePublished - 2002
Externally publishedYes
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: Jan 14 2002Jan 17 2002


Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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