Twirled stream

Creation of universal mathematical model of the turbulent twirled stream is a necessary condition for working out of adequate methods of calculation of gas bottles of different technological appointment, their optimization regime and design data, abbreviation of expensive experimental researches. Now in connection with rapid development of computer production engineering essential progress was outlined in working out of more and more difficult mathematical model approaches to calculation of gas bottles. 

Modeling of d5mamics of a dispersoid in a gas bottle completed question first of all character traffic of polydispersion particles in the turbulent twirled stream, the complicated interacting of corpuscles with walls, with each other and with a bearing turbulent stream. Difficulties are called by indeterminate form of entrance conditions, possibly change of number and a size of corpuscles as a result of crushing or concretion, a deformation of corpuscles (drops, bubbles), and also other reasons. 

In Reference (Vatin, 2003 and Rodionov, 1985), it is noted that now versatile application of the twirled streams advance process of their research. It leads to thereto that there are many individual highly effective gas-cleaning installations, but their wide eireulation is restrained by absence of accurate recommendations for transition to other produetivity or change of operating modes. Analogous remarks ean be foimd and in other survey research studies on these subjects. 

Without research of three-dimensional stmcture of sharp twirled stream, it is impossible to size up correctly new design solutions and to find boundary lines of conversion zones of woik for whirlwind apparatuses, it is impossible to define, whether peak efficiency of target process, and the main thing is attained,—it is impossible to create the similarity theory of sharp twirled streams necessary for realized and purposeful perfection of gas-cleaning installations. 

To carry out the complex stmctural analysis of hydrodynamics of the bearing medium in a scmbber for the purpose of refinement of representations about real formation of the turbulent twirled stream and revealing of reserves of perfection of the apparatus. 

Ivanov, A.A. Calculation and Designing ofWhirlwind Separation Apparatuses on the Basis of the Structural Analysis of Hydrodynamics of the Twirled Streams. Dissertation Assoc. Prof Dr. Ing. Dzerzhinsk 1998, 307 p, (in Russian). 

Sazhin, B. S. and Gudim, L. I. Dedusters with the Counter Twirled Streams the Chemical Industry. Moscow,1984,8, 50-54 p, (in Russian). 

Saburov, E. N. Carps, S. V andOstashev, S. I. Heat Exchange and Aerodynamics of the Twirled Stream in Cyclonic Devices. Leningrad Publishing House 1989. 

For calculation of fractional efficiency of a dust separation in a scrubber the mathematical model of a mass transport firm of gas in liquid in a zone of motion of a twirled layer of drops is made. At model formulation it was considered that the dust separation in the apparatus occurs as at the expense of centrifugal separation in the twirled stream, and by their inertia... 

Lagutkin, M. G. and Baranov, D. A. Estimation of act of coriolis force in apparatuses with the twirled stream. Theoret.Bases Chem.Eng.lOMJ, 9-13,(in Russian). 

The formation of the turbulent twirled stream essentially differs from the forward. Under the influence of a centrifugal force in the twirled stream, there are pressure gradient on radius, the return currents, the raised speeds at a wall, non-linearity of a profile of tangential stresses, etc. In turn, these phenomena make strong impact on regularity of motion of drops of a liquid in a deduster and character of a current in a boundary layer on a phase boundary gas—a liquid, i.e., define both separation efficiency, and a water resistance, and a criticality of work of dedusters [1-9],... 

On character of distribution of axial speed, the twirled streams are classified as follows Frolov (1978) ... 

Equality of design data n testifies to identity of aerodynamic characteristics of the twirled streams on an exit from geometrically similar air swirlers of the same type. 

TABLE 16.1 Design data of air swirlers and aerodynamic characteristics of the twirled stream created by them... 

Except design data n, the twirled stream in a deduster is characterized ... 

Centrifugal devices with vortex generator type TBVP are most full investigated researched in coimection with use of the twirled streams in processes heat- and mass transfer, and also burning (Samsonov, 1974 and Kolbom, 1964 and Ke-pelman, 1960). 

---