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About 10,000 papers for “Transient flow”

Transient Flow

Jafar Mehdi Hassan, Riyadh S. Al‐Turaihi, Salman Hussien Omran et al. · BENTHAM SCIENCE PUBLISHERS eBooks · 2021

The study of hydraulic transients began with the investigation of the propagation of sound waves in air, the propagation in shallow water and flow of blood in arteries. However, none of these problems could solved rigorously until the development of elasticity and calculus and the solution of parties' differential equations. In this chapter, a number of commonly used terms are defined, and a brief history of the development of the knowledge of hydraulic transients is presented. The basic water hammer equations for the change in pressure caused by an instantaneous change in flow velocity are then derived. A description of the propagation and reflection of waves produced by closing value at downstream and of a single pipeline is presented. This is followed by a discussion of the classification and causes of hydraulic transients. Unsteady flow through closed conduits is described by the dynamic and continuity equations. The derivation of these equations is presented and methods available for their solution are discussed. Methods for controlling transients flow using various devices available to reduce or to eliminate the undesirable transients. Boundary conditions for these devices will be developed, which are required for the analysis of a system by the method of characteristics.

Cited by 0

Transient Fluid Flow

Nurhayati, Windra Yusman, Sparisoma Viridi et al. · OSF Preprints (OSF Preprints) · 2017

Cited by 0Open access

Transient Fluid Flow

Sparisoma Viridi, Fannia Masterika, Nurhayati et al. · OSF Preprints (OSF Preprints) · 2017

Cited by 0

Transient Fluid Flow

Fannia Masterika, Nurhayati, Windra Yusman et al. · OSF Preprints (OSF Preprints) · 2017

Cited by 0

Transient Cavitating Pipe Flow

Victor L. Streeter · Journal of Hydraulic Engineering · 1983

When a liquid column in a pipeline is pulled apart by the upstream velocity being less than the downstream velocity for a sufficient period of time, cavitating flow occurs over portions of the pipeline. The cavitating flow, with vapor pressure at its surface, is acted on by friction and by gravity (for sloping pipes). Analytical equations are developed which yield vaporous velocity and vapor fraction as functions of time and distance throughout the cavitating regions. These regions may be reduced only through consolidation caused by liquid impingement. Equations for the pressure rise across the shock face and for speed of consolidation are developed. A program which includes these concepts permits transients in piping systems to be calculated for several boundary conditions. Comparisons with experiment and with other methods are presented.

Cited by 36

The transient cavity flow

Selçuk Atalay · Enlighten: Theses (The University of Glasgow) · 2011

The use of cavity reveals many problems related to the application of weapons storage mechanisms, as the opening of doors at subsonic and supersonic speeds produces high intensity noise which could damage the internal stores and surrounding cavity structures. Furthermore, the flow inside the cavity could cause a considerable drag force on the object. The objective of this thesis is to explore experimentally the effect of the door kinematics in the transient phase of the cavity flow. Transient wall pressure at 12 pressure taps which are arranged in a line along the centreline of the cavity floor are measured in a very low-speed wind tunnel facility. Data were acquired for two opening door mechanisms – one appliance has a vertical doors opening mechanism with a longitudinal hinge, and the other one is a lateral sliding opening mechanism. In both cases, the door movement has been observed to affect cavity pressures over a long period of time, before reaching steady levels. A passive flow control (cylinder) was also demonstrated to act effectively in the shortening of the transient phase. These studies have been supported by the flow visualisation, and a preliminary use of Particle Image Velocimetry (PIV).

Cited by 0Open access

L20010 Transient Flow of Gas

K.W. HANNAH, E. H. Batey, J. F. Wilkinson et al. · 1964

Developments are necessary to apply automation concepts to the gas industry, in this case, a mathematical model for a pipeline system. This report has two purposes. First, it is a survey of the research conducted in the PRCI NX-37 Transient Flow Study in 1962. Then enough details are presented on the two major computational techniques developed (the special numerical integration and the transfer function) to enable those interested persons within the gas industry to duplicate the techniques.

Cited by 0

Transient eddy current flow metering

J Forbriger, F Stefani · Measurement Science and Technology · 2015

Measuring local velocities or entire flow rates in liquid metals or semiconductor melts is a notorious problem in many industrial applications, including metal casting and silicon crystal growth. We present a new variant of an old technique which relies on the continuous tracking of a flow-advected transient eddy current that is induced by a pulsed external magnetic field. This calibration-free method is validated by applying it to the velocity of a spinning disk made of aluminum. First tests at a rig with a flow of liquid GaInSn are also presented.

Cited by 20Open access