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• W237779987 abstract "In calculating the gas regimes of furnaces, buildings, storehouses, etc. one encounters the problem of maintaining atmosphere sterility in a technological chamber connected to the outer atmosphere through a horizontal slot channel. Here a conditioned atmosphere is supplied to the technological chamber, and the atmosphere flows out through outlet aperture of the channel. Maintenance of the chamber atmosphere sterility, which enables performance of the technological process in the chamber, allows for aerodynamic choking of the channel by the chamber atmosphere flow due to convective and diffusive propagation of air through the channel directly into the chamber. The literature describes rather thoroughly the forced choking modes for horizontal slot channels [ 1, 2 ]. The present work is devoted to investigating the poorly studied mode of free-convection choking of a channel. We consider a physical model of atmosphere flow in a channel (Fig. 1). Let the Grashof number be quite large (Gr >> I). Then the mixing zone for the chamber atmosphere and the air forms a thin boundary layer with free borders, i.e., a free torch [3 ], that is located in general inside the channel and whose width is substantially less than the height of the channel H. The torch, reaching the upper wall of the channel, turns to the outlet aperture and forms an arched near-wall torch directed toward the outer aperture of the channel. Here, the free torch ejects air that is drawn into it through the outlet aperture of the channel and moves thereby oppositely to the near-wall torch. The torch is maintained by the flow of the chamber atmosphere. The intensity of the vertical free-convection flow depends on the intensity of the forced injection of the atmosphere into the free torch and, in turn, determines the intensity of the ejection of air by the torch. The position of the torch in the channel is determined by the condition of equality of the momenta of the flows of the atmosphere and the air, i.e., the torch is considered as a gas gate. If the atmosphere flow momentum is greater than that of the air flow, then the torch is blown out of the channel. Otherwise, the torch is drawn deeper into the channel. When the torch is located directly at the outlet aperture, air does not enter into the channel, and the chamber is completely choked aerodynamically. If the torch is located in the channel at a certain distance from the outlet, propagation of air into the chamber is prevented but air penetrates into the channel. This mode also maintains the sterility of the chamber atmosphere and is called a partial choking mode. In comparison with the complete aerodynamic choking mode the latter is more economical in terms of consumption of the atmosphere. Let the chamber atmosphere and the ambient atmosphere (air) have the same chemical composition and differ negligibly in temperature. The temperatures of the chamber atmosphere and the air are denoted by to and t| respectively. Here to > to,. Po and P~ are the pressure in the torch and that of the ambient air, respectively. The pressure Po is determined below. Since the free-convection layer is quite thin and changes in density are negligible, then within the framework of boundary layer theory this problem may be described by self-similar equations written in the Boussinesq approximation [3 ]:" @default.
• W237779987 created "2016-06-24" @default.
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• W237779987 date "1994-01-01" @default.
• W237779987 modified "2023-09-27" @default.
• W237779987 title "A free-convection mechanism of movement of the atmosphere flowing from a sterile chamber through a flat horizontal channel, when the ambient atmosphere is drawn in, has been described. Calculated depths of ambient atmosphere penetration into the channel and dependences of the Reynolds number of the chamber atmosphere on the Grashof number, obtained by solving self-similar boundary layer equations written in the Boussinesq approximation, are given." @default.
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