Beam Vibration Induced Acoustic Streaming

ISBN-13: 9783639163155 / Angielski / Miękka / 2009 / 176 str.

Qun Wan

Opis

The purpose of this research is to investigate thebeam vibration induced acoustic streaming. Analyticalresults show that the beam vibrating in standingwaveforms scatters the acoustic waves into the freespace with a larger attenuation coefficient andlonger propagating traveling wavelength than those ofthe plane wave. In contrast to a constant Reynoldsstress in the plane wave, the Reynolds stressgenerated by such acoustic wave is expected to drivethe free space streaming away from the anti-nodes andtowards nodes of the standing wave vibration. Thesonic and ultrasonic streamings within the channelbetween the vibrating beam and a parallel stationarybeam are also investigated. The sonic streaming isfound to be mainly the boundary layer streamingdominating the whole channel while the ultrasonicstreaming is clearly composed of two boundary layerstreamings near both beams and a core regionstreaming, which is driven by the streaming velocityat the edge of the boundary layer near the vibratingbeam. The acoustic streaming cooling effect isanalyzed. The hysteresis and driven cavity phenomenaare explored with discovery of interestinginteractions among the primary eddies.

O autorze

Dr. Qun Wan received the B.E. degree from University of Science
and Technology of China in 1996, the M.S. degree from the
National University of Singapore in 2001, and the Ph.D. degree
from North Carolina State University in 2003. His interest
focuses on CFD, electronics cooling and packaging. He is
affiliated with ASME and a senior member of IEEE.