Acoustically generated flows in microchannel flexural plate wave sensors: Effects of compressibility


Sayar E., Farouk B.

SENSORS AND ACTUATORS A-PHYSICAL, cilt.171, sa.2, ss.317-323, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 171 Sayı: 2
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.sna.2011.08.018
  • Dergi Adı: SENSORS AND ACTUATORS A-PHYSICAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.317-323
  • Anahtar Kelimeler: Flexural plate wave (FPW), Acoustic streaming, Microchannel, Micropump, Acoustic waves, Fluid damping, Lamb wave
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

Acoustically generated flowfields in flexural plate wave sensors filled with a Newtonian liquid (water) are considered. A computational model based on compressible flow is developed for the sensor with a moving wall for pumping and mixing applications in microchannels. For the compressible flow formulation, an isothermal equation of state for water is employed. The velocity and pressure profiles for different parameters including flexural wall frequency, channel height, amplitude of the wave and wave length are investigated for four microchannel height/length geometries. It is found that the flowfield becomes pseudo-steady after sufficient number of flexural cycles. Both instantaneous and time averaged results show that an evanescent wave is generated in the microchannel. The predicted flows generated by the FPWs are compared with results available in the literature. The proposed device can be exploited to integrate micropumps with complex microfluidic chips improving the portability of micro-total-analysis systems. (C) 2011 Elsevier B.V. All rights reserved.