Open AccessThe coefficient of discharge in a channel with side narrowing
Author(s) -
M. L. Medzveliya
Publication year - 2015
Publication title -
vestnik mgsu
Language(s) - English
Resource type - Journals
eISSN - 2304-6600
pISSN - 1997-0935
DOI - 10.22227/1997-0935.2015.6.110-114
Subject(s) - mechanics , reynolds number , viscosity , surface tension , flow (mathematics) , tension (geology) , materials science , acceleration , channel (broadcasting) , pressure gradient , thermodynamics , composite material , physics , classical mechanics , electrical engineering , engineering , turbulence , ultimate tensile strength
The author considers the influences of the forces of viscosity and superficial tension on the discharge ratio in a channel with side narrowing. In the article the equation is presented that takes into account the influence of all the factors: the pressure, the speed of the liquid, liquid density, dynamic viscosity, superficial tension, gravity acceleration, expense per unit of width, width of the course, width of narrowing. Superficial tension and liquid density for the used liquids changed a little.The narrowing in the rectangular tray was achieved by force of flowing liquid between rectangular parallelepipeds, which were attached to the wall of the tray. The dimensions of the rectangular parallelepipeds were: the length L = 200 mm, the width B = 33 mm, and the depth of the mouth b = 34 mm.The findings of the experiment proved that the increase in the Reynolds number causes the increase flow discharge ratio and it approaches the constant value at Re ≥ 4000.