Bed Topography Effect on Flow in a Meander
Stabilized bed topography in a meandering channel with fixed walls and movable bed was measured at various width-depth ratios and Froude numbers. Velocity and bed-shear distributions were...

Flow in Conduits with Low Roughness Concentration
Transition functions which relate the friction factor and the relative roughness to the Reynolds number are obtained by utilizing the basic laws for turbulent flow in conduits plus the...

Sediment Sampling Efficiency of Slots
The sediment sampling efficiency of two-dimensional slots in open channel was studied. Eight fractions of sand and gravel were used ranging in size from 0.2 mm to 4.5 mm. A universal relation...

Scaling Methods for Surface Aerators
The scaling laws for relating the performance of different-sized surface aerators are reviewed. It is concluded that complete dynamic similarity, stipulated by simultaneous equality of...

Surface Tension in Froude Models
A criterion for avoiding surface tension effects in Froude models is obtained analytically for uniform flows. Experiments show that surface tension does not, in practice, limit the scale...

Resistance Coefficient of Uniform-Sand Roughness
The Weisbach resistance coefficient, f, is a boundary-drag coefficient. In the gross sense over a finite length of boundary, the coefficient...

Development of Roll-Wave Trains in Open Channels
The maximum depth at wave crest, minimum depth at wave trough, wave period and wave velocity of spontaneously developed roll-wave trains were measured in a laboratory channel. Channel...

Nondimensional Gradually-Varied Flow Profiles
Chezy's and Manning's flow formulas are used to formulate flow equations for gradually-varied flow in wide rectangular channels. The flow equations are normalized...

Pressure Fluctuations on Submerged Sluice Gate
Investigations were carried out to determine the functional relationship between the Froude number and the magnitude, distribution and frequency of pressure fluctuations on the downstream...

Local Scour Around Bridge Piers
Local scour caused by the horseshoe vortex system which forms at the base of the piers is considered. Piers which induce a pressure field strong enough to cause the formulation of the...

Horizontal Surface Discharge of Warm Water Jets
Large thermal-electric power plants use an average of 1.5 cfs per Mw cooling water, with a temperature rise of about 10○ F to 20○ F, and flow velocities with a mean of about 7 fps; the...

Effects of Viscous Sublayer on Dispersion
The dimensionless dispersion coefficient for a pollutant ejected into a uniform turbulent flow is shown to depend on the characteristics of the viscous sublayers; calculations are carried...

Turbulent Flow of Non-Newtonian Suspensions in Pipes
A physical model of the turbulent now of purely viscous, non-Newtonian fluids in smooth pipes has been postulated. According to this model the chaotic motions of particles increase the...

Validity of Stokes Theory for Accelerating Spheres
Measured displacement-time relations for spheres gravitationally accelerating from rest through viscous fluids are compared with the displacement-time relations predicted by the Stokes...

Boundary-Layer Development at Curved Conduit Entrances
To gain a better understanding of the energy reduction in a conduit inlet shaped according to potential-flow theory, boundary-layer measurements were made in a nonrecirculating air duct...

Profile of the Hydraulic Jump
A generalized water-surface profile is presented for hydraulic jumps formed in smooth and horizontal rectangular channels. The vertical scale is equal to 0.75 times the height of the jump,...

Laminar Flow in Finitely Wide Rectangular Channels
Experimental investigations in rectangular channels with width-to-depth ratios ranging from 2.74:1 to 100:1 confirm the Boussinesq solution of Poisson's equation for two-dimensional...

Fall Velocity of Irregular Shaped Particles
The determination of the free-fall velocity of irregularly shaped particles in viscous fluids is presented. A shape parameter is proposed which correlates Reynolds number with drag coefficient...

Nonlinear Flow Through Granular Media
Relative roles of steady and unsteady fluid motion in causing deviation from the linear Darcy resistance law are described. Air velocities and turbulence intensities were measured within...

Distribution of Energy Losses at Conduit Trifurcations
An equation for the estimation of energy losses occurring in individual branches of a trifurcation is presented. Experiments were conducted for division of flow on nine trifurcations with...

 

 

 

 

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