Discharge ratio of the broad-crested weir flowin the low head area КОЭФФИЦИЕНТ РАСХОДА ВОДОСЛИВА С ШИРОКИМ ПОРОГОМВ ОБЛАСТИ МАЛЫХ НАПОРОВ

• Main Authors: Medzveliya Manana Levanovna, Pipiya Valeriy Valerianovich
• Format: Article
• Language: English
• Published: Moscow State University of Civil Engineering (MGSU) 2013-04-01
• Series: Vestnik MGSU
• Subjects: discharge ratio of the broad-crested weir flow; Reynolds number; superficial tension; relative pressure; Weber number; rectangular tray; коэффициент расхода; число Рейнольдса; число Вебера; водослив с широким порогом; поверхностное натяжение; относительный напор; прямоугольный лоток
• Online Access: http://vestnikmgsu.ru/files/archive/RUS/issuepage/2013/4/20.pdf
• ISSN: 1997-0935; 2304-6600

The authors consider the influence of the Reynolds number on the discharge ratio of the broad-crested weir. The authors provide an overview of their experiment in thearticle. They provide the equation that takes account of each factor of influence, including H — pressure over the broad-crested weir, P — weir height above the bottom, v — liquid velocity, ρ — liquid density, μ — dynamic viscosity, g — superficial tension, σ — gravity acceleration, q — per-unit weir flow, B — width of the weir, L — length of the weir. Superficial tension and liquid density values have minor differences for different fluids.A broad-crested weir flow was organized in the rectangular tray (6,000×100×200). The flow had the following dimensions: weir length L = 40 mm, weir height P = 50 mm, weir width B = 100 mm. The findings of the experiment have proven that the increase in the Reynolds number causes the increase in the broad-crested weir flow discharge ratio (at the pre-set relative pressure) and it approaches the constant value at Re ≈ 2000.<br>Рассмотрен вопрос о влиянии числа Рейнольдса на коэффициент расхода водослива с широким порогом. Показано, что коэффициент расхода водослива увеличивается с ростом числа Рейнольдса (при заданном относительном напоре), приближаясь к постоянному значению при Re ≈ 2000.