Based on the characteristics of the flocculation tank an analysis of the influence of the turbulent kinetic energy on flocculation is carried out The conclusion indicates that the optimum value of A1/A2 is from 1. 2 to 1. 5, where A1 is the area in the current s corner and A2 is the area in the current s passage.

Starting from the fundamental equations for viscous flow, and using gene-ralized tensor form, this paper strictly derives the exact transport eqtations ofthe Reynolds stress, and of the turbulent kinetic energy as well as of the rateof turbulent kinetic energy dissipation for three-dimensional incompressible steadyflows in general rotating and non-orthogonal curvilinear coordinate systems.

In this paper the finite analytic method and K- e turbulent model for low Reynolds number are employed to solve Reynolds equations. In two cases of Reynolds number being 104 and 106 , the turbulent flow past a flood discharge tunnel is calculated and results are given for distributions of stream function, velocity, vorticity, turbulent kinetic energy and turbulent dissipation rate.

DLR k ε turbulece model·BFC method was used to conduct numerical calculation for three calculated examples of turbulent flow on a conical diffuser. The results of calculation showed that the wall value ε in,w of the inlet boundary condition of turbulent dissipation ratio had considerable influence on the distribution of longitudinal velocity ,turbulence energy k and eddy viscosity υ t in the centre of flow field but less influence on ε distribution.

The Reynolds numbers of the calculated cases at the entry of pipe were 2.93×105 and 1.16×105. This paper gives out the numerical results such as mean velocity in the leading flowing direction, turbulence energy, shear stress, and compares the rate of pressure rehabilitating in a conical diffuser with outlet pipe and one in a conical diffuser without outlet pipes.

The research has been done for pipe entry Reynolds numbers of 293 000 and 116 000 .The calculated result of the distribution of the mean flow velocity and turbulence energy has been given out under the different calculated conditions, such as grid numbers and difference method. It was analysed and compared with the test result respectively, and it got the effect of calculated result under the different calculated conditions.

The research has been done for pipe entry Reynolds number of 2. 93×105 and 1.16×105 ,and has given the efficiently computed results such as mean velocity profiles, turbulence energy profiles, shear stress profiles, and mean pressure distribution.

The conclusion indicates the optimum value of A 1/A 2 is from 1.2 to 1.5,where A 1 is the area of the wetted cross section in the corner and A 2 is the area of the wetted cross section in the gallery.

The turbulence characteristics of flow in the junction region of the endwall and the suction surface of blade of a compressor cascade passage were measured by using a three-dimensional Laser Doppler Velocimetry system. The result indicated that the turbulence kinetic has a maxima in the core regions of the streamwise vortex and regions that interacted between the vortex and boundary layer, and the vortex or motion of the vortex has strong influence on the distributions of the Reynolds stress.

The results show that the electric efficiency of the stirrers with Gramme winding and dispersive winding are higher than that with centralize winding at the same stirrer length, coil numbers and current intensity, so that higher magnetic intensity, velocities and kinetic energy can be obtained in the molten steel.

Gas streamlines, turbulent kinetic energy isolines, and turbulent viscosity isolines are determined at various operating and design parameters.

Basic dynamic parameters of turbulent flow (velocity profiles, stream-function isolines, vortex strength, turbulent kinetic energy, turbulence scale, and effective viscosity) are calculated using the K-ε model and the Kolmogorov-Prandtl closure.

The influence of a solar eclipse on the turbulent kinetic energy, turbulent heat flux, and variance and spectral density of the power of air-temperature pulsations are estimated.

Two new results were obtained: the theoretical estimate of the contribution of the wind waves to the flux of the turbulent kinetic energy at the sea surface and the model estimate of the effect of wind waves on the marine dynamics.

Flow patterns and dissipation of turbulent kinetic energy in near-wall turbulence

We consider a system consisting of the equation of motion, the equation for the turbulence energy, the expression relating the turbulence coefficient with the turbulence scale, and the integral formula for determining the turbulence scale.

Use of the turbulence energy equation in the theory of jet flows

Development of techniques and investigation of turbulence energy at the axis of a two-phase turbulent jet

In flows with variable density, the turbulence energy equation contains a large number of correlations, about which little is at present known [1].

An approximate theory is proposed for describing the effect of large vortices on the pressure pulsations, the profiles of the pulsation velocities, the turbulence energy, and the velocity correlations (turbulence friction stresses).

This paper presents the results of the analysis and numerical solution of the three-dimensional turbulent incompressible flow in an S-shaped rectangular duct. The category of the flow in the duct is defined as partially parabolic situation in nature, so that the events at a downstream location are transmitted upstream but solely through the mechanism of pressure transmission.Under the curvilinear orthogonal coordinates considered the iterative procedure for solving the governing equations can be easily performed...

This paper presents the results of the analysis and numerical solution of the three-dimensional turbulent incompressible flow in an S-shaped rectangular duct. The category of the flow in the duct is defined as partially parabolic situation in nature, so that the events at a downstream location are transmitted upstream but solely through the mechanism of pressure transmission.Under the curvilinear orthogonal coordinates considered the iterative procedure for solving the governing equations can be easily performed from the first bend to the end of the second bend of the duct. In the present study,a two equation turbulence model is employed.The two variables in the model are the kinetic energy of turbulence and its rate of dissipation. A comparison has been made between the theoretical and experimental results, and the agreement is satisfactory.

This paper presents the results of the analysis and numerical solution of the three-dimensional turbulent incompressible flow in an S-shaped rectangular duct. The nature of the flow in the duct is regarded as partially parabolic, so that events at a down-stream location are transmitted upstream solely through the mechanism of pressure transmission. In the curvilinear orthogonal coordinates considered an iterative procedure for solving the governing equations can be easily performed from the first bend to the...

This paper presents the results of the analysis and numerical solution of the three-dimensional turbulent incompressible flow in an S-shaped rectangular duct. The nature of the flow in the duct is regarded as partially parabolic, so that events at a down-stream location are transmitted upstream solely through the mechanism of pressure transmission. In the curvilinear orthogonal coordinates considered an iterative procedure for solving the governing equations can be easily performed from the first bend to the end of second bend of the duct. In the present study, a two-equation turbulence-model is employed. The two variables in this model are the kinetic energy of turbulence and its rate of dissipation. A comparison between theoretical and experimental results has been made, and the agreement is satisfactory.

This paper reports the results of numerical solution of recirculating flow in the powdered-coal boiler burner with a bluff body. With a view to simplifying the calculation, the flow of the first vent in the direct flow coal burner is assumed to be a two-dimensional turbulent free jet. In this calculation, the orthogonal cartesian coodinate and a two-equation turbulence model is employed. The governing equations are continuity equation, momentum equation, kinetic energy equation and kinematic rate of dissipation...

This paper reports the results of numerical solution of recirculating flow in the powdered-coal boiler burner with a bluff body. With a view to simplifying the calculation, the flow of the first vent in the direct flow coal burner is assumed to be a two-dimensional turbulent free jet. In this calculation, the orthogonal cartesian coodinate and a two-equation turbulence model is employed. The governing equations are continuity equation, momentum equation, kinetic energy equation and kinematic rate of dissipation equation. The elliptic differential equations are transformed into the discretization equations by the cell integration method.A simple method dealing with inclined wall of the cone-body in recirclating flow is presented specially. The lengths of the recirculation zones are measured by the hot wire anemometer and the flourscent wire to check up the method. A comparison has been made between the predicted and the experimental results, and a good agreement is found.