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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.Vachagina E.K. – doctor of technical sciences E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan Scientific Center of Russian Academy of Sciences The organization address: 420111, Russia, Kazan, Lobachevsky st., 2/3 Zolotonosov Ya.D. – doctor of technical sciences, professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Mustakimova S.A. – leading programmer E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Krutova I.A. – post-graduate student E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Civil Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1
Title of the articleThe definition of the equivalent diameter of the screw channels type «confuser-diffuser»
Abstract.Heat transfer equipment is widely applied in systems of industrial heat power engineering and industrial technologies in various industries. Currently, the creation of intensified heat transfer equipment is a very actual problem. One of the ways of solving this problem is the use of heat-exchange elements, ensuring the twist of the flow of fluid, and in particular, the screw pipe type «confuser-diffuser». As you know, these channels showed a high effectiveness as modulators of convective heat transfer in experimental studies. Correct calculation of heat exchangers is a fundamental task for the engineer. The results of experiments to determine the hydraulic resistance and the amount transferred through the heat exchange surface of heat, as is known, the generalized criterion equations, which as a typical size used is equivalent diameter. The article is devoted to the method of calculating the equivalent diameter of the screw pipe of type «confuser-diffuser». In this paper we have obtained expressions for the description of the boundaries of the cross section of the channel. The formulas to calculate the wetted perimeter, cross-sectional area and equivalent diameter is interesting from a practical point of view. The results of this work can be used in the design and calculation of a new intensified heat transfer equipment.
Keywords.hydrodynamics, heat transfer, channels of the type «confuser-diffuser», covariant and contravariant components of velocity, streamlines, secondary flows.
For citations:Vachagina E.K., Zolotonosov Ya.D., Mustakimova S.A., Krutova I.A. The definition of the equivalent diameter of the screw channels type «confuser-diffuser» // Izvestiya KGASU. 2016. №4(38) P.295-302.


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