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

Abstract

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.

Inventors:
;
Issue Date:
Research Org.:
The Regents of the University of California, Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174569
Patent Number(s):
6644118
Application Number:
10/243,429
Assignee:
The Regents of the University of California (Los Alamos, NM)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Kaduchak, Gregory, and Sinha, Dipen N. Cylindrical acoustic levitator/concentrator having non-circular cross-section. United States: N. p., 2003. Web.
Kaduchak, Gregory, & Sinha, Dipen N. Cylindrical acoustic levitator/concentrator having non-circular cross-section. United States.
Kaduchak, Gregory, and Sinha, Dipen N. Tue . "Cylindrical acoustic levitator/concentrator having non-circular cross-section". United States. https://www.osti.gov/servlets/purl/1174569.
@article{osti_1174569,
title = {Cylindrical acoustic levitator/concentrator having non-circular cross-section},
author = {Kaduchak, Gregory and Sinha, Dipen N.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {11}
}

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Works referenced in this record:

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


Compact acoustic levitation device for studies in fluid dynamics and material science in the laboratory and microgravity
journal, November 1985


Extension of acoustic levitation to include the study of micron‐size particles in a more compressible host liquid
journal, May 1982


Acoustic filtration and sedimentation of soot particles
journal, December 1997


Blood Concentration by Superposition of Higher Harmonics of Ultrasound
journal, May 1997


Transport and harvesting of suspended particles using modulated ultrasound
journal, November 1991