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Cylindrical acoustic levitator/concentrator having non-circular cross-section

Patent ·
OSTI ID:1174569
;
A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow piezoelectric crystal which has been formed with a cylindrical cross-section to tune the resonance frequency of the breathing mode resonance of the crystal to that of the interior cavity of the cylinder. When the resonance frequency of the interior cylindrical cavity is matched to the breathing mode resonance of the cylindrical piezoelectric transducer, the acoustic efficiency for establishing a standing wave pattern in the cavity is high. By deforming the circular cross-section of the transducer, the acoustic force is concentrated along axial regions parallel to the axis of the transducer. The cylinder does not require accurate alignment of a resonant cavity. The concentrated regions of acoustic force cause particles in the fluid to concentrate within the regions of acoustic force for separation from the fluid.
Research Organization:
The Regents of the University of California, Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-36
Assignee:
The Regents of the University of California (Los Alamos, NM)
Patent Number(s):
6,644,118
Application Number:
10/243,429
OSTI ID:
1174569
Country of Publication:
United States
Language:
English

References (8)

Compact acoustic levitation device for studies in fluid dynamics and material science in the laboratory and microgravity journal November 1985
Transport and harvesting of suspended particles using modulated ultrasound journal November 1991
Blood Concentration by Superposition of Higher Harmonics of Ultrasound journal May 1997
Acoustic agglomeration of a glycol fog aerosol: Influence of particle concentration and intensity of the sound field at two frequencies journal June 1995
Extension of acoustic levitation to include the study of micron‐size particles in a more compressible host liquid journal May 1982
Acoustic Positioning for Space Processing of Materials Science Samples in Mirror Furnaces conference January 1983
Acoustic radiation potential on a sphere in plane, cylindrical, and spherical standing wave fields journal March 1985
Acoustic filtration and sedimentation of soot particles journal December 1997

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