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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of regular arrays of antidots in YBa2Cu3O7 thin films and observation of vortex lattice matching effects (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 962-964 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optimized sputtered YBa2Cu3O7 (YBCO) thin films on CeO2-buffered sapphire substrates are patterned into square lattices of submicrometer holes (antidots) with diameters of 250–450 nm and lattice parameters of d=500–1000 nm without deterioration of superconducting properties. In the mixed state, matching effects between the Abrikosov vortex lattice and the artificial antidot lattice are observed. These effects are in the form of peaks or cusps in the critical current density recorded as a function of magnetic induction at integers n and specific rationals k/l of the matching field Bm=(Φ0/d2). The experimental results are discussed in the context of existing theories. The existence of multiquanta vortices confined by the holes in YBCO films are considered. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119701
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  • 2
    Electronic Resource
    Electronic Resource
    Interfacial electrohydrodynamic instability: The Kath and Hoburg model revisited (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1307-1309 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A revision of the Kath and Hoburg model for the interfacial electrohydrodynamic instability in the case of two miscible fluids having identical properties but differing conductivities is attempted. Experiments performed by the same authors to validate their model show that the measured wave numbers do not correspond to the modes of maximum instability. In fact, the model is unable to give a preferred wave number. An analysis of the possible explanations for this discrepancy is made. In this Brief Communication the existence of a transient surface tension as the wave number selection mechanism is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858249
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  • 3
    Electronic Resource
    Electronic Resource
    The stability of a planar layer of insulating liquid subjected to charge injection and rotation (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 1948-1955 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The problem of the hydrodynamic stability of a plane dielectric liquid layer subjected to unipolar injection and rotation examined here is in many ways analogous to that of rotating horizontal fluid layer heated from below. In both situations instability is likely to arise as steady or oscillatory convection depending on the values of only two parameters. The critical conditions for which instability sets in as a steady convection are determined as functions of both the Taylor number and the level of injection. Because of the mathematical complexity of the problem, the onset of convection as overstability is determined only for the particular case of weak injection. In this case, an analytical treatment is carried out that allows discrimination of regions of steady and oscillatory convective instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866209
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  • 4
    Electronic Resource
    Electronic Resource
    Linear convective patterns in cylindrical geometry for unipolar injection (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 37-44 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Linear stability theory is used to discriminate between the possible convective structures (axisymmetric rolls, axially independent columns, and general three-dimensional patterns) in the case of unipolar injection between coaxial cylinders of arbitrary radii. The cases of weak, strong, and arbitrary finite injection, either from the inner or outer cylinder, are considered. In all cases three-dimensional modes are found to be the least stable. Physical mechanisms involved are discussed thoroughly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857689
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of an axial electric field on the stability of a rotating dielectric cylindrical liquid bridge (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 2069-2071 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The branching points of the shape families bifurcating from a cylindrical liquid bridge anchored on two plane-parallel electrodes, when subjected to rotation and an electric potential difference, are determined. It is shown that the cylindrical shape may be destabilized through either an axisymmetric mode or a C mode. The stable region in the parameter space is always enlarged as the electric field is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857792
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  • 6
    Electronic Resource
    Electronic Resource
    Physical mechanisms of instability in a liquid layer subjected to an electric field and a thermal gradient (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 1684-1701 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear stability of a plane layer of dielectric liquid subjected to an electric field and a thermal gradient is studied. The liquid is supposed to have a non-negligible residual conductivity and to exhibit an injection of charge from one of the electrodes. Both effects are due to the dissolution of a given salt in the liquid. The ionic mobility and the dielectric constant are temperature dependent. The stability of this configuration is studied with the help of an heuristic model and a precise discussion of the physical mechanisms of instability is made. Complete sets of the stability maps corresponding to different cases are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868231
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal and electrohydrodynamic plumes. A comparative study (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2091-2096 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we deal with self-similar thermal and electrohydrodynamic (EHD) plumes. The former arises from hot lines or points, whereas the latter arises when sharp metallic contours submerged in nonconducting liquids support high electrostatic potential, resulting in charge injection. Although the motive force is buoyancy in one case and Coulomb force in the other, it is shown that the solution for EHD plumes is the same as for thermal plumes in the limit of large Prandtl numbers. We present the analysis of axisymmetric plumes for large values of Prandtl number, and this analysis is subsequently applied to EHD plumes. The validity of the approximations for EHD plumes is discussed in the light of experimental data. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868983
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  • 8
    Electronic Resource
    Electronic Resource
    Some considerations on the instabilities of nonpolar liquids subjected to charge injection (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 7 (1995), S. 1348-1356 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrohydrodynamic stability of a plane layer of nonpolar liquid is analyzed under certain basic assumptions. The liquid is supposed to be perfectly insulating, the space charge resulting from a unipolar injection of charge. The injection is considered to be nonautonomous, that is, following a field dependent law. The regions of linear stability under stationary conditions have been computed both in terms of nondimensional parameters and directly measurable variables, such as the applied voltage and the gap spacing between the electrodes. The results have shown that the onset of instability is strongly dependent on an injection strength parameter and can be approximated by the linear criterion corresponding to autonomous injection, provided that the injected charge is given by the injection law. Experiments have also been performed to determine the instability threshold under transient conditions. An interpretation of these experiments has been done by generalizing an approximated theoretical study for autonomous injection to the case of a nonautonomous injection. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868522
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  • 9
    Electronic Resource
    Electronic Resource
    Conical points in liquid-liquid interfaces subjected to electric fields
    Amsterdam : Elsevier
    Physics Letters A 184 (1994), S. 268-272 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(94)90387-5
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  • 10
    Electronic Resource
    Electronic Resource
    Dissipative hydrodynamic oscillators (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 727-737 
    Details
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano qui le previsioni che riguardano l'insorgenza di onde gravitazionali elettrocapillari trasversali nell'interfaccia di due fluidi quando un campo elettrico tangenziale o ortogonale viene imposto all'interfaccia. Particolari applicazioni includono interfacce ariaolio e aria-mercurio.
    Abstract: Резюме В работе делаются предсказания, касающиеся возникновения поперечных гравитационно-электро-капиллярных волн на границе раздела двух жидкостей, когда на границу раздела накладывается либо тангенциальное, либо ортогональное электрическое поле. Рассматриваются некоторые применения к границам раздела воздух-нефть и воздухртуть.
    Notes: Summary Provided here are predictions concerning the onset of transverse gravity-electro-capillary waves at the interface of two fluids when either a tangential or an orthogonal electric field is imposed to the interface. Particular applications include air-oil and air-mercury interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451559
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