Ejection-induced change in the structure of a turbulent wake

The paper presents results of an experimental model investigation of the transformation of the velocity field behind a two-dimensional body under the influence of a jet emerging from a slot. Profiles of the mean velocity and the longitudinal and transverse components of the velocity are measured at a distance of up to 30 diameters from the body downstream. The jet was ejected through slots of different widths at a flow rate that ensures the establishment of the maximum bottom pressure.     

Kinematic similarity of a turbulent swirled flow in a pipe

It is shown that in the case of a developed turbulent rotating flow in a pipe kinematic similarity occurs at large distances from the swirl source.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 20, No. 3, pp. 434–438, March, 1971.     

Diffusion of aerosols in a tube with turbulent flow

Aerosol diffusion in a tube with turbulent flow is investigated. Two systems of aerosol diffusion are considered; the first case with uniform inlet aerosol concentration and without formation in flight, and the second without aerosol particles at the tube inlet and with formation in flight. Both systems have been found in practical applications. Observations of the results indicate that the Reynolds and Schmidt numbers, which characterize the gas flow and aerosol diffusion, respectively, play an extremely important role in the determination of aerosol concentration.     

Diffusion of inertial particles in a turbulent gas jet

An algorithm is proposed and a mathematical experiment is performed on the diffusion of high-density particles in a turbulent gas jet. The problem is solved with the impurity particle action on the carrier phase characteristics taken into account.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 57, No. 3, pp. 367–375, September, 1989.     

Diffusion burning in a system of two-dimensional turbulent jets

Diffusion burning of nonpremixed gases in a system of two-dimensional turbulent jets is examined. The problem is solved with the aid of a numerical method. Analytical results obtained for a hydrogen jet in a jet of air are given in the form of graphs.     

Temperature fluctuation balance in an axisymmetric turbulent wake

Results of experiments conducted in the thermal wake behind an axisymmetric body are used to evaluate the radial profiles of different terms of the balance equation for the mean square of temperature fluctuations.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 50, No. 2, pp. 181–187, February, 1986.     

Simulation of fine-dispersed turbulent flow in a pipe on the basis of the nonlinear model of turbulent viscosity

A nonlinear model of turbulent viscosity (the explicit algebraic Reynolds stress model) for gas-dispersed flow with small heavy particles has been presented. The calculations have been checked by comparison with the experimental data on the effect of the fine-dispersed admixture on turbulent flow of air in a pipe.     

Diffusion of bubbles in turbulent flow

The diffusion of bubbles in turbulent flow is considered. A relation is found for the coefficients of turbulent diffusion of bubbles and liquid particles of a carrier medium.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 31, No. 4, pp. 678–683, October, 1976.     

Transformation of acoustic distortions into coherent structures in the turbulent wake behind a profile

The article describes the experimental investigation of the effect of acoustic distortions on the mean and pulsating characteristics of flow in the turbulent wake behind a profile. It is demonstrated that acoustic vibrations are intensely transformed into vortex distortions of the flow.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 47, No. 4, pp. 533–536, October, 1984.     

Determining the average flow characteristics of the carrier fluid in a turbulent gaseous suspension

The effect of solid particles on the thickness of the viscous sublayer in a stream of a gaseous suspension is analyzed on the basis of the two-layer flow model. The characteristics of the velocity profile of the carrier gas are determined, with collision interaction between solid particles and channel walls taken into account.     

Asymptotic scaling in turbulent pipe flow

The streamwise velocity component in turbulent pipe flow is assessed to determine whether it exhibits asymptotic behaviour that is indicative of high Reynolds numbers. The asymptotic behaviour of both the mean velocity (in the form of the log law) and that of the second moment of the streamwise component of velocity in the outer and overlap regions is consistent with the development of spectral regions which indicate inertial scaling. It is shown that an 'inertial sublayer' in physical space may be considered as a spatial analogue of the inertial subrange in the velocity spectrum and such behaviour only appears for Reynolds numbers R+>5 x 10(3), approximately, much higher than was generally thought.     

Mathematical analysis of whirled turbulent flow through a pipe

The effect of rotation of the stream on the development of turbulent flow in a pipe is analyzed by a numerical method. Calculated distributions of average turbulence velocity and energy are compared with experimental data.     

The final stage of degeneration in the turbulent pattern for a passive trace component in a wake

A multiparameter differential model has been used to derive asymptotic formulas for the behavior of a passive component in the final stage of degeneration in a turbulent wake.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 51, No. 5, pp. 723–728, November, 1986.     

Deposition of microparticles from a turbulent stream onto a pipe wall

An equation for the flux of particles to the inner wall of a pipe, in good agreement with experimental data, is obtained under certain assumptions about the mechanism of transport of solid microparticles in a turbulent gas or liquid stream. The problem of the variation in the density of microparticles along the length of a pipe is also solved.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 61, No. 1, pp. 56–58, July, 1991.     

Experimental study of turbulent flows of weak polymer solutions in a pipe

Experimental data are presented on the frictional drag of weak solutions of guaiacum, polyox, and polyacrylamide flowing in pipes, as well as on the measured velocity profiles in guaiacum solutions. The mixing lengths in the pipe cross section are calculated.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 18, No. 6, pp. 1085–1093, June, 1970.     

Diffusion in a laminar boundary layer of a turbulent jet incident on a plate

Solutions are found for the stationary and nonstationary equations of convective diffusion on the basis of an experimentally detected hydrodynamic flow picture of an ideal fluid. The agreement between the results of boundary-layer soundings, obtained by different methods, is shown.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 4, pp. 674–682, April, 1977.     

On the space-charge longitudinal wake field in perfectly conducting pipe of planar geometry

Longitudinal space-charge wake field is considered for a beam of rectangular cross-section propagating between two perfectly conducting planes. It is shown that the forces driving negative mass instability are weaker compared to circular configuration. A similar effect takes place for a flattened (ribbon) beam.     

The turbulent nonisothermal flow of an incompressible gas in a circular rotating pipe

The nonisothermal, fully developed turbulent flow of an incompressible gas in a circular rotating cylindrical pipe is discussed. Equations are given for one-point second moments of velocity and temperature pulsations. The results of calculating the thermal characteristics are given.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 18, No. 1, pp. 96–104, January, 1970.