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  • Tian, Yuren  (18)
  • Comparative Studies. Non-European Languages/Literatures  (18)
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  • Comparative Studies. Non-European Languages/Literatures  (18)
RVK
  • 1
    Online Resource
    Online Resource
    Acousto-electric generation of charged clusters and drop arrays
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3058
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3058
    Abstract: Novel, compact instrumentation for studying the behavior of drop arrays and sprays, and of clusters of drops, permits fundamental research into the behavior of reacting and nonreacting fluid species. The new capability is made possible by simultaneous levitation and charging of ‘‘seed’’ droplets (10–30 m in diameter) which come together in 2-D clusters. These clusters are interesting in their own right because of their crystalline and quasi-crystalline forms, which depend on the acoustic and electric field parameters. By varying the electric and acoustic field intensities, one can cause the clusters to condense into larger drops (e.g., 50–300 m) which, because of their charge, form uniformly spaced 2-D arrays of monodispersed drops. One or more layers of these 2-D arrays can form in the acoustic standing wave. Such a configuration permits a wide range of fundamental studies of drop evaporation, combustion, and nucleation. The drops can be single or multicomponent. Therefore, fundamental materials studies can also be performed. Instrument characteristics and initial studies with the new apparatus will be reviewed. [Work supported by JPL 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.418713
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Oscillations of a water drop with surfactant Triton X-100 in zero gravity
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3059
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3059
    Abstract: Large amplitude nonlinear oscillations of an axially symmetric water drop of 2.51-cm diameter, initial aspect ratio 3.4, with surfactant Triton X-100 of 0.5 mM, in zero gravity are studied by a boundary element method. Included in the analysis are surface-shear and dilatational viscos- ity, under the assumption that the shear viscosity of the bulk phase is small. Numerical simulations of the drop oscillations are in good agreement with the experimental results of drop oscillations measured in space during the second United States Microgravity Laboratory, USML-2. The evolution of the drop oscillations for both experiment and simulation is given. The simulation provides predictions for the values of both surface dilatational viscosity and shear viscosity of 0.20 sp and 0.10 sp, respectively. In addition, with the simulated data, the damping constants, frequencies, and decomposed oscillation modes are computed. [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.418715
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Study of surface dynamics of drops in the presence of surfactants
    Acoustical Society of America (ASA) ; 1991
    In:  The Journal of the Acoustical Society of America Vol. 89, No. 4B_Supplement ( 1991-04-01), p. 1862-1862
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 89, No. 4B_Supplement ( 1991-04-01), p. 1862-1862
    Abstract: The characteristics of capillary waves, especially energy dissipation, are strongly influenced by the presence of surfactants. The phenomenon has been studied by investigating experimentally the free quadrupole oscillations of a fluid drop acoustically levitated in the air. The experimental apparatus is similar to that of Trinh [Rev. Sci. Instrum. 56, 2059 (1985)], and the methods follow those reported by Lu and Apfel [J. Colloid Interface Sci. 134(1), 245 (1990)] . Using this system, the frequency of free quadrupole oscillations and its damping constant can be measured. Water drops with different sizes and different surfactant concentrations were used in the measurements. Experiment results show that the technique used here, which is nonperturbative and requires a very small amount of sample, may supplement other methods to measure the surface properties of liquid. [Work supported by NASA through JPL, Contract 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2029286
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1991
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Materials characterization of surfaces of water drops with surfactants by acoustic means: The need for a microgravity environment
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2365-2365
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2365-2365
    Abstract: The goal of this laboratory’s ground-based and microgravity research is to determine the rheological properties of liquid drops of single or multiple components in the presence or absence of surface active materials by exciting drops into their quadrupole resonance and observing their free decay. The resulting data coupled with appropriate theory should enable one to understand better the physics of the underlying phenomena, providing a better foundation than earlier empirical results could. The space environment makes an idealized geometry available (spherical drops) so that theory and experiment can be properly compared, and allows a ‘‘clean’’ environment, namely, an environment in which no solid surfaces come in contact with the drops during the test period. Moreover, by considering the oscillations of intentionally deformed drops in microgravity, a baseline is established for interpreting surface characterization experiments done on the ground by this and other groups. Results of work at Yale and in the first United States Microgravity Laboratory (USML 1, summer 1992) will be presented. [Work supported by NASA through JPL Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.406186
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Drops in space: Spacelab experiments on surfactant-bearing drops
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2365-2365
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2365-2365
    Abstract: Utilizing a dedicated acoustic positioning apparatus called the Drop Physics Module (DPM) aboard the First United States Microgravity Laboratory (USML-1) mission, single surfactant-bearing drops were excited into their quadrupole resonance and observed during free decay. Surface shear and dilatational viscosity and Gibb’s elasticity are inferred from the frequency and damping measurements using a modification of a previous theory [H.-L. Lu and R. E. Apfel, J. Fluid Mech. 222, 587 (1991)]. Measurements were performed for various combinations of surfactant type, concentration, and drop size. Results from ground-based experiments in ultrasonic fields will also be presented and compared. [Work supported by NASA through JPL Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.406158
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Direct observation of microbubble oscillations
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2922-2922
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 98, No. 5_Supplement ( 1995-11-01), p. 2922-2922
    Abstract: The study of microbubble oscillations is important for the understanding of sonoluminescence phenomena. Bubble dynamic behavior is conventionally detected with light scattering techniques. This method generally gives little information about the shapes of a bubble during its oscillation. In order to observe the bubble shapes, a direct imaging system was set up. The shape of a bubble levitated in a liquid is magnified and displayed on a TV screen. The bubble is illuminated with an LED lamp which is strobed at a frequency slightly different from the driving sound field. This technique can slow the moving image of the bubble, allowing one to observe the shape of a bubble oscillating between 5 to 100 μm in diameter. Experiments show that when a bubble oscillates with sonoluminescence, it keeps a closely spherical shape during the entire oscillation period. However, with the increase of gas concentration in the host liquid, sonoluminescence disappears and higher mode shapes are developed during the bubble’s shrinking period. Experiments also show that the asymmetric shape of the bubble may cause the levitated bubble to become unstable. [Work supported by NASA through JPL, contract 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.414437
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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  • 7
    Online Resource
    Online Resource
    Finite static deformation and translational motion of an acoustically levitated liquid drop in air.
    Acoustical Society of America (ASA) ; 1992
    In:  The Journal of the Acoustical Society of America Vol. 91, No. 4_Supplement ( 1992-04-01), p. 2397-2397
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 91, No. 4_Supplement ( 1992-04-01), p. 2397-2397
    Abstract: Acoustical levitation has been applied in studies of droplet dynamics and interfacial properties. On the ground, when the density difference between droplet and host medium is large, the intensity of the levitation sound field must be strong enough to overcome gravity. As a result, the droplet may significantly deviate from spherical shape. A numerical method to determine the finite deformation and location of an acoustically levitated liquidated liquid drop in air has been developed. Compared with the previous studies [P. L. Marston, J. Acoust. Soc. Am. 67, 15–26 (1980) and H. W. Jackson et al., J. Acoust. Soc. Am. 84, 1845–1862 (1988)], the interactions between droplet and sound field and the nonspherical acoustical scattering are included in our analysis, making the present method valid for droplets with aspect ratio as large as 2. With this method, the droplet shapes and locations as functions of sound pressure, surface tension, and droplet volume in both gravity and nongravity environments have been systematically calculated. The numerical results agree well with these experimental measurements and those of Trinh and Hsu [J. Acoust. Soc. Am. 79, 1335–1338 (1986)] . [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.403265
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1992
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    The radial oscillations of a gas bubble in a surfactant solution
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2384-2384
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 4_Supplement ( 1993-04-01), p. 2384-2384
    Abstract: In a surfactant solution, a gas bubble can be covered by an adsorbed film of surfactant. When the bubble is excited into radial oscillations by a sound field, the surface concentration of the surfactant varies with the surface area and the mass interchange between the surface and the bulk liquid. As a result, the surface tension becomes a function of the bubble radius. Previous theoretical work on this subject [R. E. Glazman, J. Acoust. Soc. Am. 74, 980–986 (1983)] will be commented on and the equations governing the radial oscillations for this kind of gas bubble will be discussed. By numerically solving the equation under different initial bubble sizes, sound pressures, and driving frequencies, one can determine the effects of variable surface tension, surface viscosity, and surface mass transfer on the motions of the gas bubble. Thresholds of transient cavitation will also be estimated by including these effects. [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.406071
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Direct observation of microbubble oscillations
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 6 ( 1996-12-01), p. 3976-3978
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 6 ( 1996-12-01), p. 3976-3978
    Abstract: A direct imaging system is introduced to study the oscillations of microbubbles acoustically levitated in water. The bubble is illuminated with a light emitting diode (LED) which is strobed at a frequency different from the driving sound field. This technique slows the moving image of the bubble, allowing one to observe the shape of a bubble oscillating between 5 to 100 μm in diameter. The bubble shapes are recorded on video tape and then analyzed by an automatic image analysis system which gives the variations of bubble diameter versus time. Experiments were performed with and without the bubbles sonoluminescing. Asymmetric shapes of the bubbles were observed in some cases.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.417339
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    Deformation and location of an acoustically levitated liquid drop
    Acoustical Society of America (ASA) ; 1993
    In:  The Journal of the Acoustical Society of America Vol. 93, No. 6 ( 1993-06-01), p. 3096-3104
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 93, No. 6 ( 1993-06-01), p. 3096-3104
    Abstract: A theoretical method to determine the location and static deformation of an acoustically levitated liquid drop in air is presented. The interaction between drop and sound field, involving nonspherical acoustic scattering and drop volume variation, is the crux of this analysis, which is valid for drops with aspect ratio as large as 2. Numerical calculations are presented of drop shape and location as functions of sound pressure, surface tension, and drop volume in both gravity (1g) and gravity-free (0g) environments. The numerical results agree well with our experimental measurements and those of other researchers.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.405721
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1993
    detail.hit.zdb_id: 1461063-2
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