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  • Tian, Yuren  (8)
  • 1990-1994  (8)
  • Comparative Studies. Non-European Languages/Literatures  (8)
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Publisher
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  • 1990-1994  (8)
Year
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Subjects(RVK)
  • Comparative Studies. Non-European Languages/Literatures  (8)
RVK
  • 1
    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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  • 2
    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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  • 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
    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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  • 5
    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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  • 6
    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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  • 7
    Online Resource
    Online Resource
    The use of acoustical levitation to estimate air content in coal particles
    Acoustical Society of America (ASA) ; 1990
    In:  The Journal of the Acoustical Society of America Vol. 87, No. S1 ( 1990-05-01), p. S21-S21
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 87, No. S1 ( 1990-05-01), p. S21-S21
    Abstract: Since the air content in coal particles is an important parameter for coal utilization, a simple method to estimate it using acoustical levitation is sought. A levitation cell that can easily trap a solid particle at its center is built and used in this study. The corresponding formula for the acoustical force on this kind of particle is also derived. Considering that a coal particle is composed of a solid component and some air, mixture laws for its density and compressibility can be assumed. Based on these relations, the air content in a coal particle can be calculated by measuring acoustical pressure in the levitation cell where it is trapped. Different coal samples are tested. The results show that the ratio of air content in the coal particle varies with its class and size.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2028125
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1990
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    Frequency of quadrupole mode oscillations of spheroidal liquid drops in an acoustic field.
    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: Ultrasonic levitation of liquid drops in air has been used [Y. Tian et al., J. Colloid Interface Sci. (submitted)] as a technique for measurement of the rheological properties (viscosity, interfacial tension, elasticity) of liquid surfaces and interfaces. The unavoidable deformation and asymmetry caused by the intensity of the sound field needed to levitate millimeter-sized water drops in air in a 1-g environment gives rise to a change in the frequency of quadrupole mode shape oscillations from the spherical value. This complicates measurements of rheological properties. Thus the frequency change due to the interaction with the sound field has been modeled. Using a unique conservation of energy approach, the shift due strictly to geometrical deformation of arbitrary origin is derived. Then realistic values of deformation and corresponding radiation force for typical cases are considered, modifying the previously obtained frequency shift values. Results are compared to experimental values obtained for millimeter-sized drops levitated ultrasonically in air in a 1-g field. [Work supported by NASA through JPL Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.403792
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1992
    detail.hit.zdb_id: 1461063-2
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