Archive - Известия Казанского государственного архитектурно-строительного университета.

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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Babich E.K. – student E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Broyda V.A. – candidate of technical sciences, associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1
Title of the articleInteraction of air screen with a slot outlet
Abstract.Problem statement. We consider an air screen with a slot outlet up a liquid mirror in an industrial bath, which protects the room air from harmful emissions accompanying the process in the bath. The flow generated by the flat jet air supply and a slot outlet under complicated boundary conditions with the help of CFD method is calculated. We take into account: the distance between the supply device and the outlet l, the distance from the axis of the screen of the air to the liquid mirror h, the width of the slot outlet B. Results. It is found that in the regime of the full capture of the jet with the minimum of air exhaust (limit capture) with h*= h/l? 0,4 jet is laid on the liquid mirror, near the supply device the circulation zone is formed. For large values of h* under the air-screen forms a continuous circulation area covering all the liquid mirror. By increasing the height h* is possible to place the details under the screen at the time of fluid draining. It is determined that in the regime of limit capture the relative flow of exhaust air ranges from values of L*=L/LП ?0,71 to L*?0,83. Conclusions. In a regime of limit capture the air exhaust, removed from slot outlet, approximates a flow rate of a semi-bounded jet and weakly depends on the distance from the axis «jet – outlet» to the liquid mirror, and the width of the outlet. The results can be used to calculate the air-jet screen of baths with high sides, providing protection from harmful emissions as the regime of details treatment and a liquid draining mode.
Keywords.air screen, flat jet, flow, outlet, capture, air flow.
For citations:Babich E.K., Broyda V.A. Interaction of air screen with a slot outlet // Izvestiya KGASU. 2017. №1(39) P.159-157.

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