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Sensing and Actuation in Miniaturized systems Final report

Sensing and Actuation in Miniaturized systems Final report. Hello everyone !!!!! I am Wu Chih-Wei !!!!!. Outline. Introduction. Fabrication. System setup. Results and discussion. Conclusion. Outline. Introduction. Fabrication. System setup. Result and discussion. Conclusion.

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Sensing and Actuation in Miniaturized systems Final report

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  1. Sensing and Actuation in Miniaturized systemsFinal report Hello everyone !!!!! I am Wu Chih-Wei !!!!!

  2. Outline Introduction Fabrication System setup Results and discussion Conclusion

  3. Outline Introduction Fabrication System setup Result and discussion Conclusion

  4. Introduction PIV INVESTIGATION OF 3-DIMENSIONAL FLOW IN DROPS ACTUATED BY EWOD EWOD = Electrowetting-On-Dielectric The change in contact angle due to an applied potential difference between solid and liquid

  5. Introduction PIV INVESTIGATION OF 3-DIMENSIONAL FLOW IN DROPS PIV = Particle Image Velocimetry mirror Laser Flow direction y Image plane x t t’

  6. Introduction PIV measurement in micro-channel flow!

  7. Outline Introduction Fabrication System setup Result and discussion Conclusion

  8. Fabrication Secure seal droplet cytop fluoropolymer SiO2 ITO Glass wafer FEATURES：Leak-proof chambers are temperature resistant and eliminate evaporation

  9. Outline Introduction Fabrication System setup Result and discussion Conclusion

  10. System setup μPIV system EWOD droplet actuation system

  11. System setup 2D velocity field near the mid-height of the drop

  12. Outline Introduction Fabrication System setup Result and discussion Conclusion

  13. Result and discussion Entire stack of 2D velocity fields Continuity equation 350um (Local form of conservation equation) 300um computing 250um 200um 150um 100um 50um Side view of the Droplet 3D VELOCITY FIELDS!!!! Image plane

  14. Result and discussion A strong downward flow due to the eletro-wetting from the bottom substrate is observed near the nose of the droplet

  15. Result and discussion To understand net effect of the forward-back motions on mixing within the droplet Measure the overall displacement of the first image from all PIV image pairs Forward-back motion is inefficient for droplet mixing!! (reverse motion return the particles near their initial position)

  16. Outline Introduction Fabrication System setup Result and discussion Conclusion

  17. Conclusion 1、Our experimental finding shows the flow in a 3D droplet indeed deviates significantly from the parabolic flow profile used in current flow simulations 2、It would be desirable to develop a reduced dimension model that is computationally tractable while preserving the essential information about the 3D velocity 3、Due to the reversibility of the flow, a simple forward-back motion is inefficient for mixing , effective mixing has to be accomplished through irreversible movements.

  18. THANK YOU FOR YOUR ATTENTION!!!!

  19. 100µm 100µm down Middle Up Channel wall 100 µm Channel wall Max Velocity：120 um/s Bonus Information! Experimental Data by Y.L.Lin 2007

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