Distribution of heat transfer agent in the capillary structure of rotating heat pipes with a displaced axis of rotation

The authors present theoretical and empirical relations describing the influence of centrifugal forces on the filling of the capillary structure by the heat transfer agent.Translated from Inzhenerno-fizicheskoi Zhurnal, Vol. 60, No. 5, pp. 835–838, May, 1991.     

Hydrodynamic regimes of a liquid in a smooth-walled rotating heat pipe. 1

The article presents the results of the analytical and experimental investigation of the hydrodynamics of a liquid in a horizontal rotating heat pipe. A formula is derived for determining the thickness of the layer of liquid entrained from the groove of the inner cylindrical surface.50th-Anniversary-of-the-Great-October-Socialist-Revolution Kiev Polytechnic Institute. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 43, No. 5, pp. 766–774, November, 1982.     

Investigation of the hydrodynamic regimes of a liquid in a smooth-walled rotating heat pipe. II

The article deals with the analytical and experimental investigation of the influence of the slope of a rotating heat pipe and of the taper of its inner surface on the hydrodynamics of a liquid.     

Vibrations of a rotating membrane with unsteady rotations of the axis of rotation

A method and algorithm are developed for numerical calculation of the vibrations of a rotating circular membrane with a rigid central insert. The vibrations are caused by plane rotation of the rotation axis with a variable angular velocity. A system of differential equations is obtained to describe the motion of the membrane in relation to the stress-strain state caused by the rotation. Calculated results are presented for the case when the angular velocity of the membrane is constant, while the angular velocity of the rotation axis changes over time in accordance with a piecewise-linear law.Translated from Problemy Prochnosti, No. 2, pp. 55–60, February, 1990.     

On liquid motion in a circular cylinder with horizontal axis

Summary The flow pattern of the slosh motion of a homogeneous, nonviscous (inviscid) and incompressible fluid with a free surface, contained in a rigid circular canal, has been dealt with analytically and experimentally. The axis of the canal is perpendicular to the direction of gravity. Considered are transverse (lateral to axis) oscillations of the liquid. The shape of the free liquid surface is determined numerically by means of a simple procedure. Theoretically calculated streamlines (path lines) are found to be in good qualitative agreement with experimentally observed trajectories of small spheres, made of plastic material and immersed in the liquid. The plastic particles and the liquid (water with a solution of salt added) have the same density.     

Vibrations of a rotating flexible rod clamped off the axis of rotation

Summary We consider a fourth-order boundary value problem associated with the small vibrations of a uniform flexible rod which is clamped at one end and rotates in a plane perpendicular to the axis of rotation. A significant feature is that the axis of rotation does not pass through the clamped end itself. For rapid rotation rates, the governing equation involves a small parameter and must be treated by singular perturbation techniques. A second parameter fixes the relative location of two turning points. For a range of this second parameter, consistent approximations to the characteristic equation are derived, and the limiting behavior of the eigenvalues is obtained.     

Pressure loss during fluid flow in a channel rotating perpendicularly to the axis of rotation

Results are presented which were obtained in experiments to determine the hydraulic resistance of a channel during its rotation around an axis perpendicular to the channel axis.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 29, No. 6, pp. 1024–1030, December, 1975.     

Quantitative relationships governing the establishment of a quasisteady destruction regime on unilaterial material heating

The nonsteady period of mass removal (entrainment) from the surface of a material has been investigated both theoretically and experimentally. Analytical relationships are proposed to make possible calculation of the characteristics of the nonsteady destruction regime for body surfaces streamlined by a high-temperature stream of gas.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 56, No. 4, pp. 533–539, April, 1989.     

Velocity regimes of motion of a viscous liquid in a horizontal rotating cylinder

The influence of viscosity on the stability of motion of a liquid tube in the cavity of a stationarily rotating horizontal cylinder is considered. An analytical condition of the stability of motion is obtained. The similarity criteria of steady motion of the liquid are selected. On the basis of experimental data diagrams of the transition boundaries for turbular and nontubular regimes of liquid motion are constructed.Rovno State Pedagogical Institute. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 64, No. 5, pp. 558–565, May, 1993.     

Effect of heat convection on the dynamics of a liquid in a rotating tank

The article investigates the dynamics of a viscous incompressible liquid in a rotating cylindrical tank in the presence of forces of heat convection.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 38, No. 2, pp. 297–302, February, 1980.     

Model of heat transfer associated with the surface boiling of liquid in tubes

A model is proposed for the heat-transfer process associated with the surface boiling of liquid in tubes. An analysis of the various constituents of the heat-transfer mechanism distributed over the thickness of the intermediate boiling layer is presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 31, No. 3, pp. 396–401, September, 1976.     

The downward motion of a liquid film in vertical tubes in an air-vapor counterflow

Results from experimental investigation into the hydrodynamics of the downward motion of a liquid film in vertical tubes in an air-vapor countercurrent are presented. In addition, we have derived the theoretical relationships for the liquid-film thicknesses and the tube-break-up density.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 15, No. 5, pp. 855–861, November, 1968.     

Theoretical analysis of condensation in a rotating heat pipe at low angular velocity of rotation

The mechanism of liquid layer formation is studied for condensation on the cylindrical wall of a rotating heat pipe in the low angular velocity range. Results of a numerical solution of the differential equation describing the condensation process are analyzed.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 60, No. 1, pp. 19–24, January, 1991.     

Oscillatory convection induced by gravity and centrifugal forces in a rotating porous layer distant from the axis of rotation

The linear stability theory is used to investigate analytically the effects of gravity on centrifugally driven convection in a rotating porous layer offset from the axis of rotation. The stability of a basic solution is analysed with respect to the onset of stationary and oscillatory convection. It is also demonstrated that the stationary mode is the critical mode of convection thereby resulting in the convection rolls being aligned parallel to the axis of rotation. Besides providing a non-motionless basic solution and dictating the direction of the wave number, gravity plays a passive role and does not affect the stability results.     

Flow and heat transfer in a film of viscous liquid on a rotating disk

A numerical method employing a computer is used to investigate the hydrodynamics and heat transfer of a thin film of incompressible viscous liquid on a rotating disk for the case of laminar flow when it is possible to neglect surface tension, body forces, and friction between liquid film and gas medium.     

Nonstationary heat and mass transfer with a reduction of the heat load in a heat exchanger with twisted tubes

The results of an investigation of the nonstationary mixing of the heat-transfer agent accompanying the reduction of the heat load in a bundle of twisted tubes are presented, and a generalizing dependence for calculating the effective coefficient of diffusion is derived.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 54, No. 4, pp. 533–539, April, 1988.     

The onset of transient Marangoni convection in a liquid layer subjected to rotation about a vertical axis

In view of the interesting possibilities of controlling surface tension-driven convection, anticipated in space experiments involving fluid interfaces, the problem of the stability of a thin horizontal fluid layer subjected to rotation about a vertical axis, when the thermal (or concentration) gradient is not uniform is examined by linear stability analysis. Attention is focussed on the situation where the critical Marangoni number is greater than that for the case of uniform thermal gradient and the convection is not, in general, maintained. The case of adiabatic boundary condition is examined because it brings out the effect of surface tension at the free surfaces and allows a simple application of the Galerkin technique, which gives useful results. Numerical results are obtained for special cases and some general conclusions about the destabilizing effects of various basic temperature profiles and the stabilizing effect of coriolis force are presented. The results indicate that the most destabilizing temperature gradient is one for which the temperature gradient is a step function of the depth. Increase in Taylor number and the inverted parabolic basic temperature profile suppress the onset of convection.