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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.Urmitova N.S. – candidate of technical sciences, associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Abitov R.N. – candidate of pedagogic sciences, associate professor E-mail: a_runar@ mail.ru Khisameeva L.R. – associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Nizamova A.Kh. – senior lecturer 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 articleInvestigation of filtering regimes by changing the hydraulic and hydrodynamic characteristics of coalescing loading
Abstract.In this paper the problem of studying hydraulic, hydrodynamic and regime characteristics of coalescing nozzles was experimentally solved. When fractions of coalesced loading are 3-5 mm the nozzle height does not affect on a hydraulic gradient. For a large fraction (15-20 mm) the following dependence is observed: the curves of hydraulic gradient depended on filtration rate become steeper with decreasing of loading height. In smaller layers of loading height the hydraulic gradient grows faster than for larger ones with increasing of filtration rate. Average values of specific grain surface were obtained based on calculations and experimental data. For 15-20 mm fraction the value is 512 м-1 and for 3-5 mm faction it is 1218 is 3,5 m-1. For loading fraction 3-5 mm the water temperature and coefficient of hydraulic resistance decrease with increasing Reynolds number (Re). When the value of Re reaches 28 the coefficient of hydraulic resistance becomes constant regardless of water temperature, i.e. the self-modeling region. For fraction 15-20 mm Re increases and coefficient of hydraulic resistance fluctuates. For Re ~ 250-350 coefficient of hydraulic resistance is more or less equalized.
Keywords.hydraulic and hydrodynamic characteristics, coalescing loading, filtering regime, experimental investigations, fraction, the Reynolds number.
For citations:Urmitova N.S., Abitov R.N., Khisameeva L.R., Nizamova A.Kh. Investigation of filtering regimes by changing the hydraulic and hydrodynamic characteristics of coalescing loading // Izvestiya KGASU. 2016. №3(37) P.205-209.


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