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  • 1
    Online Resource
    Online Resource
    Influence of the Sound Field on the Intensity of Sonoluminescence
    IOP Publishing ; 1998
    In:  Japanese Journal of Applied Physics Vol. 37, No. 5S ( 1998-05-01), p. 2832-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 37, No. 5S ( 1998-05-01), p. 2832-
    Abstract: Cavitation-field sonoluminescence intensity was measured in correlation with sound pressure and its harmonic and subharmonic component signals generated from a well-defined cavitation field in a distilled-water filled rectangular cell by changing the acoustic frequency and the voltage applied to the transducer. Optics was designed to ensure that all the sonoluminescing positions in the cell were detectable by a photomultiplier tube. The results show that it is the second harmonic component of the sound pressure waveform, rather than the subharmonic one, which gives a reliable indication of the threshold of the cavitation and the onset of the cavitation-field sonoluminescence. The sonoluminescence signal exhibits a linear relationship with the simultaneously measured second harmonic component signal and is likely to originate mainly from the subset of stable cavitation bubbles in the cavitation field.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.37.2832
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Quenching Mechanism of Multibubble Sonoluminescence at Excessive Sound Pressure
    IOP Publishing ; 2001
    In:  Japanese Journal of Applied Physics Vol. 40, No. 5S ( 2001-05-01), p. 3856-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 40, No. 5S ( 2001-05-01), p. 3856-
    Abstract: Decrease in luminous intensity of multibubble sonoluminescence (MBSL) at excessive ultrasonic intensity is studied in connection with the behavior of cavitation bubbles. The intensity of MBSL from aerated distilled water in a rectangular vessel with six transducers, in which a standing wave field was established, was measured while the voltage applied to the transducers was increased. The corresponding change in the distribution of cavitation bubbles in the field was observed. The distributions of bubbles were compared with those of MBSL using an intesified charge-coupled device (ICCD) camera, and the bubble motion was observed with a high-speed camera. It is clarified that the expulsion of bubbles from the pressure antinode in the field is responsible for the decrease in MBSL intensity at high ultrasonic intensity. The expulsion is caused by the primary Bjerknes force which changes from an attractive force to a repulsive one depending on pressure amplitude and bubble radius, assisted by coalescence of bubbles due to the secondary Bjerknes force.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.40.3856
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2001
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Difference in Threshold between Sono- and Sonochemical Luminescence
    IOP Publishing ; 2000
    In:  Japanese Journal of Applied Physics Vol. 39, No. 5S ( 2000-05-01), p. 2962-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 39, No. 5S ( 2000-05-01), p. 2962-
    Abstract: The difference in threshold between sonoluminescence (SL) and sonochemical luminescence (SCL) has been investigated. The intensity of both SL from distilled water and SCL from a luminol solution in a rectangular glass cell was measured while changing the driving frequency and voltage applied to the transducer. The second hamonic component of the sound-pressure waveform was also measured simultaneously. The results show that the thresholds in sound pressure become higher for cavitation, SCL and SL in this order. As the dissolved gas in a liquid decreases, the SCL intensity decreases but the SL intensity increases. For a constant quantity of dissolved gas, as the liquid temperature becomes higher, the SCL intensity increases but the SL intensity decreases. In the case of air-saturated liquids, the difference in threshold between SCL and SL becomes larger as the liquid temperature increases. The dependence of the ratio of SCL to SL on temperature is similar to that of vapor pressure.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.39.2962
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2000
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Effects of Nonlinearity in Development of Acoustic Streaming
    IOP Publishing ; 1995
    In:  Japanese Journal of Applied Physics Vol. 34, No. 5S ( 1995-05-01), p. 2584-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 34, No. 5S ( 1995-05-01), p. 2584-
    Abstract: Development of acoustic streaming generated along the beam axis of ultrasound in unbounded medium is discussed using a numerical analysis. Acoustic nonlinearity changes the distribution of driving force of streaming. If fluid-dynamic nonlinearity is neglected, the streaming velocity essentially increases in proportion to the square of source amplitude. Incorporation of acoustic nonlinearity enhances the streaming velocity near the sound source and suppresses it at a farther distance compared to the acoustically linear case. When fluid-dynamic nonlinearity is taken into account, the fundamental trend in the increase of streaming velocity changes from the second power of the source amplitude toward the first power. Thus the fluid-dynamic nonlinearity delays the development of acoustic streaming.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.34.2584
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    Control of a Standing Wave Field Using a Line-Focused Transducer for Two-Dimensional Manipulation of Particles
    IOP Publishing ; 1998
    In:  Japanese Journal of Applied Physics Vol. 37, No. 5S ( 1998-05-01), p. 2974-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 37, No. 5S ( 1998-05-01), p. 2974-
    Abstract: Control of the positions of particles using acoustic radiation pressure in water was studied to develop a noncontact micromanipulation technique. In this paper a method to transport the particles two-dimensionally using an ultrasonic standing wave field between a line-focused transducer with multiple electrodes and a reflector placed at the focal line is described. When alumina suspension of mean diameter 16 µm was poured into the standing wave field of 2.1 MHz, the particles were trapped and agglomerated at sound pressure nodes existing at half wavelength on the sound beam axis near the reflector. Changing the frequency alters the wave-length and hence the interval of agglomeration. Therefore the trapped particles were transported along the sound beam axis. When the next electrodes were driven, the standing wave field shifted laterally and the trapped particles moved to the corresponding nodal points. Thus two-dimensional transportation was realized using the line-focused transducer. A sound field generated by the line-focused transducer was discussed based on numerical calculations to design an optimum shape of a transducer for manipulation.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.37.2974
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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  • 6
    Online Resource
    Online Resource
    Measurement of Distribution of Acoustic Radiation Force Perpendicular to Sound Beam Axis
    IOP Publishing ; 1999
    In:  Japanese Journal of Applied Physics Vol. 38, No. 5S ( 1999-05-01), p. 3297-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 38, No. 5S ( 1999-05-01), p. 3297-
    Abstract: To clarify the range of force acting on a particle in the direction perpendicular to the sound beam axis of an ultrasonic standing wave for particle manipulation, the radiation force on a polystyrene sphere of submillimeter size was measured through observation of its movement in a 1.75 MHz ultrasonic standing wave. The radiation force was estimated at some points by balancing with the force from viscous drag proportional to the measured velocity of a particle and the gravitational force, and its distribution was determined. The measured distribution of the radiation force agreed qualitatively with the theoretical distribution derived from Nyborg's formula. The influence of gravitational force on a stable position was also investigated. It was shown that the shift from the stable position is marked for particles with large radius. This effect should be considered in particle manipulation.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.38.3297
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Observation of a Sonoluminescing Bubble Using a Stroboscope
    IOP Publishing ; 2000
    In:  Japanese Journal of Applied Physics Vol. 39, No. 5S ( 2000-05-01), p. 2967-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 39, No. 5S ( 2000-05-01), p. 2967-
    Abstract: A method to observe sonoluminescing bubble motion has been studied. By a single flash of a stroboscope much shorter than the acoustic cycle, a charge coupled device (CCD) camera captures an instantaneous image of the bubble, which includes the dancing condition. Changing the flash timing of the stroboscope slowly made it possible to observe periodical expansion and contraction of the bubble. It is clarified that the bubble size and the phase at the time the bubble collapses changes according to the amplitude of sound pressure.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.39.2967
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2000
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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    Online Resource
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