Cavitation from Surface Irregularities in High Velocity
Irregularities in flow surfaces of hydraulic structures operating at high velocities have been the source of serious damage by cavitation. The types of surfaces often encountered in construction...

Cavity Expansion in Sands with Curved Envelopes
The effect of a curved Mohr-Coulomb failure envelope on the bearing capacity of deep foundations in sands is considered by obtaining solutions to expansion of cavity problems. An analytic...

Unsteady Stratified Circulation in a Cavity
A transient two-dimensional model with idealized topography (i.e., cross section of a rectangular lake) is examined using numerical models. The primary results define the behavior of the...

Predicting Cavitation in Sudden Enlargements
In recent years incipient, critical, and choking cavitation levels have been introduced as design criteria for orifices and valves in pipelines. Recent studies have evaluated a fourth...

Cavitation Control by Aeration of High-Velocity Jets
To prevent cavitation erosion, air may be introduced along the underside and sides of a jet before the jet comes in contact with downstream concrete surfaces. Model studies of chute offsets,...

Failures in Limestones in Humid Subtropics
Limestones and similar carbonate rocks comprise about 10% of the world's surface rocks. Solution of porous limestones creates networks of small cavities from less than an...

Convective Transport Finite Element Analog
A finite element method for solving two-dimensional steady convective heat transfer problems is presented and applied to three test cases for verification. The fully nonlinear momentum...

Flow-Induced Forces on Protruding Walls
A two-dimensional wall of variable thickness, protruding from a plane boundary, may be regarded as a basic geometrical configuration encountered in many instances of flow-induced structural...

Gas Release During Transient Cavitation in Pipes
Some applications are presented of a mathematical model concerning water hammer and release of dissolved gas in pipelines in the case where the pressure drops to the vapor pressure of...

Cavitation and Size Scale Effects for Orifices
Cavitation data are presented for circular sharp-edged orifices which identify incipient, critical, moderate, heavy, and choking cavitation. The experimental program included pipe sizes...

Cavitation Scale Effects for Valves
Proper use of experimental cavitation data for valves requires adjustments for scale effects including the influence of valve size and operating pressure. Incipient and critical cavitation...

Cavitation in Butterfly Valves
Tests made at Colorado State University have resulted in a generalization of cavitation data making them useful in developing pipeline designs utilizing butterfly valves as controls. Related...

Analytical Study of Pressurized Elliptical Cavities

Cavitation Characteristics of 18-inch Butterfly Valve

Cavitation in High-Head Conduit Control Dissipators
The wasting of water from high-head hydraulic structures through a closed conduit requires an economical control and energy dissipator device which will safely contain the potentially...

Expansion of Cavities in Infinite Soil Mass
A general solution is presented of the problem of expansion of spherical and cylindrical cavities in an infinite soil mass. The soil is assumed to behave as an ideal elastic-plastic solid,...

Pressure Buckling of Ring Encased in Cavity
The buckling of a ring subjected to external pressure but supported by a rigid cavity wall is investigated using small deflection linear theory. It is assumed that the cavity wall moves...

Cavitation in Horizontal Pipelines due to Water Hammer
Some effects of water hammer in horizontal pipelines are investigated for the case where the pressure reaches vapor pressure. A theory based on the presence of nuclei is set up, but fails...

Choking and Supercavitating Valves
The occurrence of choking flow or supercavitation downstream of valves can result in unsatisfactory performance. A valve chokes when the mean pressure immediately downstream drops to vapor...

Cavitation Parameters for Outlet Valves
Testing of regulating valves to determine their flow and cavitation characteristics in order to make a practical and economic selection of valves for use in hydraulics control is described....

 

 

 

 

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