Needle Valves as Pressure Regulators
The potential of needle valves issuing into sudden expansions as the primary components of large closed conduit pressure regulating structures is analyzed. Results are presented of research...

Review of Cavitaion Research on Valves
Critical cavitation indices are presented for a 12-in. ball and a 12-in. butterfly valve installed in a closed conduit system with, a sudden expansion downstream of the valves. Tests were...

Flow Characteristics of Butterfly and Spherical Valves
Discharge coefficients of butterfly and spherical valves are given. The data were obtained from tests of 10-in. diam models. Four butterfly valve disks were tested, all lenticular in shape....

Reducing Cavitation in Valves
Critical cavitation indices are presented for a 12-in. ball and a 12-in. butterfly valve installed in a closed conduit with an enlarged section downstream. Tests were conducted under normal...

Feasibility of Improved Subsurface Disposal
A simplified and improved design scheme for subsurface soil absorption systems is presented. The scheme involves intermittent dosing of a cavity with a storage volume equal to the expected...

Stress Concentration in Strain-Gradient Bodies
An analytical solution is presented to a boundary-value problem in the linear elasticity in which potential energy depends on strains and strain gradients. The problem considered is that...

Sudden-Enlargement Energy Dissipater for Mica Dam
The design of a sudden-enlargement energy dissipator to reduce the operating heads and, hence, the velocities along the flow surfaces in the Mica Dam low-level outlets is developed with...

Some Analytical Results for Planet 90° Bend Flow
Analysis of inviscid nonturbulent flow around bends preceded and followed by straight conduits on a potential and frozen-vorticity basis indicates the manner in which bend curvature and...

Fluid Mechanics and Lock Design
Navigation locks must have rapid and stable systems for filling and emptying. Key considerations in designing these systems are inertia, cavitation and losses within the conduit, and seiches,...

Fluctuation of Pressure in Conduit Expansions
In a companion paper to a recent study of cavitation and energy dissipate in conduit expansions, the writers present measurements of the magnitude and scale of boundary pressure fluctuations...

Grouting a Dam Cutoff in Cavernous Limestone
Cutoff treatment at Logan Martin Dam was especially important in providing a stable and watertight foundation. Complex cavity systems occurred in the fractured dolomitic limestone bedrock....

Cost and Economics of Maintenance of Turbine Runner Cavitation
Five, single unit, 20,000-kw hydroelectric power plants, built with turbine settings as specified by the manufacturer have runner cavitation or pitting repair problems in a short time...

Viscoelastic Wave Interaction with Cylindrical Cavity
Stresses at a free-field point and on the boundary of a circular hole in a viscoelastic plate subjected to air shock loading were determined by photoviscoelastic and moiré methods. The...

Spherical Elastic Plastic Shock Propagation
The response of an infinite, elastic, perfectly plastic medium governed by the Von Mises yield condition is considered, containing a spherical cavity whose surface is subjected to a uniform...

Pressure Generated by Cavitation in a Pipe
When the velocity of a liquid in a pipe is rapidly decreased at a point, such as behind a rapidly-closing valve or a pump following power failure, the pressure at this point may drop to...

Two-Dimensional Jet and Cavity Flows
A method is given for calculating the location of free streamlines and the flow coefficient in certain two-dimensional, potential flows: Jet flow from a contracting channel and cavitating...

Shapes for Appurtenances in Stilling Basins
Baffle pier experiments in hydraulic jump type of stilling basins indicate that wedge-shaped blocks with a vertex angle of 120○ dissipate more energy in a shorter length than rectangular...

Water Jet Pump
The water jet pump, when designed with experimentally obtained optimum dimensions, can achieve efficiencies in the range of 35% to 40%. The design depends on the selected nozzles and diffuser,...

Water Hammer Resulting from Cavitating Pumps
In the transport of phosphate-ore slurry in a pipeline containing pumps in series, a pump will occasionally blow up. Previously, investigated failure that stemmed from water hammer, as...

Cavitation in Hydraulic Structures: Problems Created by Cavitation Phenomena
The damage from cavitation, which has been an increasing problem with the increasing size of hydraulic structures, often results from neglect in the design of these structures. Such design...

 

 

 

 

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