Vibrational hydrodynamic gyroscope

Козлов, В. Г.; Kozlov, Nikolai

doi:10.1134/s1028335807080137

Cited by 22 publications

(18 citation statements)

References 2 publications

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“…The mechanism of the generation of the body lagging rotation relative to the cavity in the two-dimensional case (the cylindrical body in rotating cylindrical cavity) is described in [4]. The sphere takes a quasistationary position at some distance from the cavity end walls.…”

Section: Resultsmentioning

confidence: 99%

“…For instance the action of transverse vibrations on the free boundary of the centrifuged liquid [2] leads to the excitation of an azimuthal wave and excitation of intensive averaged liquid flow. Similar resonance effects occur when the free flowing medium [3] or a light cylindrical body [4] are in rotating system instead of a gas phase. In the last case, the vibration leads to the oscillation of the body and the emergence of its intensive differential rotation relative to the cavity, called "vibrational hydrodynamic top. "…”

Section: Introductionmentioning

confidence: 91%

“…If the density of the body coincides with the density of the fluid, then static or oscillating external force fields do not influence the body, which performs the solidstate rotation together with the liquid and the cavity. As shown in [4], the differential rotation speed of the light free body in the case of vibrational hydrodynamic top ΔΩ/Ω rot ∼ (1 − / ) 2 , where is the body density and is the fluid one. The body of low density is free and is near the cavity axis due to the action of the centrifugal force.…”

Section: Discussionmentioning

confidence: 99%

“…The mechanism of the flows generation is associated with the occurrence of the viscous stresses on the body surface as a result of its oscillation relative to the cavity [4]. The averaged viscous stresses result in rotation of both the body and the fluid.…”

Section: Discussionmentioning

confidence: 99%

“…In the last case, the vibration leads to the oscillation of the body and the emergence of its intensive differential rotation relative to the cavity, called "vibrational hydrodynamic top. " Description of the differential rotation in the two-dimensional formulation is given in [4]. The presence of a rotating force field in a rotating frame leads to the circular oscillations of the body.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid

Козлов

Subbotin

2014

Advances in Acoustics and Vibration

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The dynamics of a light sphere in a quickly rotating inclined cylinder filled with liquid under transversal vibrations is experimentally investigated. Due to inertial oscillations of the sphere relative to the cavity, its rotation velocity differs from the cavity one. The intensification of the lagging motion of a sphere and the excitation of the outstripping differential rotation are possible under vibrations. It occurs in the resonant areas where the frequency of vibrations coincides with the fundamental frequency of the system. The position of the sphere in the center of the cylinder could be unstable. Different velocities of the sphere are matched with its various quasistationary positions on the axis of rotating cavity. In tilted rotating cylinder, the axial component of the gravity force appears; however, the light sphere does not float to the upper end wall but gets the stable position at a definite distance from it. It makes possible to provide a vibrational suspension of the light sphere in filled with liquid cavity rotating around the vertical axis. It is found that in the wide range of the cavity inclination angles the sphere position is determined by the dimensionless velocity of body differential rotation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid

Козлов

Subbotin

2014

Advances in Acoustics and Vibration

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Dynamics of Rotating Two-phase System Under Transversal Vibration

Сальникова

Kozlov

Ivanova

et al. 2008

Microgravity Sci. Technol

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Mean dynamics of light granular matter in liquid in the rotating horizontal cylinder subjected to transversal vibrations is experimentally investigated. The excitation of outstripping and lagging azimuth motion of the interface with respect to the cavity is revealed at definite ratios of rotation and vibration frequencies υ r . The motion is generated by the inertial oscillations arising in the system in a resonant way. The formation of regular spatial structures on the interface is revealed at intensive outstripping motion. These structures have azimuth and axial periodicity and their shape depends on the type of inertial waves arising in the cavity. Intensity and direction of azimuth flows as well as shape of patterns on the granular matterliquid interface are determined by the ratio υ r . It is shown, that the lagging motion exists at υ r < 1, and the outstripping one exists at υ r > 1. Combined action of vibrations and rotation provides an efficient mechanism of mass transfer control, the intensity of mean flows in the cavity frame can be of the same order of magnitude as the rotation velocity.

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Dramatic Effect of Vibrations on Dynamics of Rotating Hydrodynamic Systems

Козлов

Ivanova

2009

Microgravity Sci. Technol.

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The results of theoretical and experimental investigation of the average dynamics of inhomogeneous systems in rotating cavity in the presence of oscillating force field are highlighted and analyzed. Average behavior of nonisothermal liquid as well as different multiphase systems (two liquids, liquid and gas, solid in liquid, granular matter in liquid) in quickly rotating horizontal cylinder subjected to vibrations of different direction is described. The specificity of dynamics of all the systems is determined by the Coriolis force which defines not only the average flows but the fluid oscillations also. The resonant excitation of inertial oscillations of liquid results in generation of intensive mean flows. The structure of vibrational streams is essentially determined by the type of inertial waves. So, excitation of an azimuthal wave generates azimuthal streams (outrunning or lagging, depending on frequency of the wave), three-dimensional standing waves (in the systems with deformable interface) generate regular spatial flows of high intensity. Under the resonant conditions the influence of vibrations appears to be very strong, the speed of mean streaming can achieve the values comparable with the speed of rotation of the container.

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Vibrational hydrodynamic gyroscope

Cited by 22 publications

References 2 publications

Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid

Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid

Dynamics of Rotating Two-phase System Under Transversal Vibration

Dramatic Effect of Vibrations on Dynamics of Rotating Hydrodynamic Systems

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