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Acoustically and electrokinetically driven transport in microfluidic devices

Başlık çevirisi mevcut değil.

  1. Tez No: 400026
  2. Yazar: ERSİN SAYAR
  3. Danışmanlar: DR. BAKHTIER FAROUK
  4. Tez Türü: Doktora
  5. Konular: Makine Mühendisliği, Mechanical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2012
  8. Dil: İngilizce
  9. Üniversite: Drexel University
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 277

Özet

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Özet (Çeviri)

Electrokinetically driven flows are widely employed as a primary method forliquid pumping in micro-electromechanical systems. Mixing of analytes and reagents islimited in microfluidic devices due to the low Reynolds number of the flows. Acousticexcitations have recently been suggested to promote mixing in the microscale flowsystems.Electrokinetic flows through straight microchannels were investigated using thePoisson-Boltzmann and Nernst-Planck models. The acoustic wave/fluid flow interactionsin a microchannel were investigated via the development of two and three-dimensionaldynamic predictive models for flows with field couplings of the electrical, mechanicaland fluid flow quantities. The effectiveness and applicability of electrokineticaugmentation in flexural plate wave micropumps for enhanced capabilities wereexplored. The proposed concept can be exploited to integrate micropumps into complexmicrofluidic chips improving the portability of micro-total-analysis systems along withthe capabilities of actively controlling acoustics and electrokinetics for micro-mixerapplications.Acoustically excited flows in microchannels consisting of flexural plate wavedevices and thin film resonators were considered. Compressible flow fields wereconsidered to accommodate the acoustic excitations produced by a vibrating wall. Thevelocity and pressure profiles for different parameters including frequency, channelheight, wave amplitude and length were investigated. Coupled electrokinetics andacoustics cases were investigated while the electric field intensity of the electrokineticbody forces and actuation frequency of acoustic excitations were varied. Multifieldanalysis of a piezoelectrically actuated valveless micropump was also presented. Theeffect of voltage and frequency on membrane deflection and flow rate were investigated.Detailed fluid/solid deformation coupled simulations of piezoelectric valvelessmicropump have been conducted to predict the generated time averaged flow rates.Developed coupled solid and fluid mechanics models can be utilized to integrate flowthroughsensors with microfluidic chips.

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