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Hydraulic resistancein channels having rough bottoms Гидравлическое сопротивление лотков с шероховатым дном

By Medzveliya Manana Levanovna and Pipiya Valeriy Valerianovich


The authors study the dependence of the hydraulic friction coefficient on the Froude number for open steady uniform flows in channels having a high relative roughness. In the article, the authors provide the equation, which describes the hydraulic resistance in open channels having rough bottoms.Experiments were conducted in the rectangular tray (6,000×100×200 mm). Metal balls having the diameter of 15.1 mm were used to simulate uniform roughness. Aqueous solutions of glycerol were added as operating fluids. Average roughness was identified as k = 0.8d. The range of values of the main factors was as follows: inclination 0.011 —0.06; the Froude number 0.13 — 6.02; relative smoothness 0.3 — 1.36. The authors have proven that the value of the coefficient of hydraulic friction in the zone of the laminar flow is not dependent on the Froude number.The influence of the Froude number on the hydraulic friction is manifested in the areas of the turbulent flow.<br>Рассмотрен вопрос о зависимости коэффициента гидравлического трения от числа Фруда открытых равномерных потоков в руслах с шероховатым дном. Показано, что коэффициент λ в области ламинарного теч��ния не зависит от числа Фруда. Влияние числа Фруда проявляется в зонах турбулентного течения, как бурного, так и спокойного

Topics: Froude number, open uniform streams, resistance coefficient, high relative roughness, aqueous solution of glycerin, Reynolds number, число Фруда, коэффициент гидравлического сопротивления, равномерные потоки, высокая относительная шероховатость, водные растворы глицерина, Engineering (General). Civil engineering (General), TA1-2040, Technology, T, DOAJ:General and Civil Engineering, DOAJ:Technology and Engineering, Architecture, NA1-9428, Construction industry, HD9715-9717.5
Publisher: Moscow State University of Civil Engineering (MGSU)
Year: 2013
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