نتایج جستجو برای: densimetric froude number

تعداد نتایج: 1168665  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2014
F Moisy M Rabaud

It has been recently emphasized that the angle of maximum wave amplitude α in the wake of a disturbance of finite size can be significantly narrower than the maximum value α_{K}=sin^{-1}(1/3)≃19.47^{∘} predicted by the classical analysis of Kelvin. For axisymmetric disturbance, a simple argument based on the Cauchy-Poisson initial-value problem suggests that the wake angle decreases following a...

1997
DANA DABIRI MORTEZA GHARIB

Sources of vorticity are examined for a laboratory-generated spilling breaking wave. Two cases are studied. For the first case, based on the breaker height, the Reynolds and Froude numbers are 7370 and 2.04, respectively. The breaker is preceded by 1 mm wavelength capillary waves, with the largest amplitude-to-wavelength ratio equal to 0.18. For this case, it is found that the dominant source o...

1998
Andrew Belmonte Hagai Eisenberg Elisha Moses

In an experiment on thin flat strips falling through a fluid in a vertical cell, two fundamental motions are observed: side-to-side oscillation (flutter) and end-over-end rotation (tumble). At high Reynolds number, the dimensionless similarity variable describing the dynamics is the Froude number Fr, being the ratio of characteristic times for downward motion and pendular oscillations. The tran...

Journal: :تحقیقات آب و خاک ایران 0
امین قاسمی گروه مهندسی آبیاری و آبادانی دانشگاه تهران محمد حسین امید گروه مهندسی آبیاری و آبادانی دانشگاه تهران محسن نصرآبادی گروه مهندسی آبیاری و آبادانی دانشگاه تهران علی رئیسی استبرق گروه مهندسی آبیاری و آبادانی دانشگاه تهران

in this research, in order to develop new relationships with reasonable accuracy for estimation of the ‎submerged hydraulic jump characteristics, a study has been conducted experimentally. experiments have ‎been done in a rectangular channel with a length of 9 m, a width of 0.5 m and a depth of 0.45 m. froude ‎numbers in these tests range from 3.5 to 11.5 and between submergence ratios of 0.1 t...

2011
F. Rostami M. Shahrokhi S. R. Sabbagh - Yazdi

Undular hydraulic jumps are illustrated by a smooth rise of the free surface followed by a train of stationary waves. They are sometimes experienced in natural waterways and rivers. The characteristics of undular hydraulic jumps are studied here. The height, amplitude and the main characteristics of undular jump is depended on the upstream Froude number and aspect ratio. The experiments were do...

Journal: :مهندسی عمران فردوسی 0
محمد بهرامی یاراحمدی محمود شفاعی بجستان

application of structures of flow pattern modification is one of the erosion control methods in bends. triangular vanes are among these structures which provide less scour depth compared to the other techniques such as spur dike. since little information on erosion and sedimentation pattern around triangular vanes are available, this study was conducted to study the effect of structure effectiv...

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