File Name: a review of water hammer theory and practice .zip
Transient simulation is very important to protect the water supply pipeline system from extreme pressures. In order to numerically simulate the transient response in a variable—property series pipe system, the water hammer model and matched boundary conditions are developed by introducing the MacCormack time marching scheme. Based on the proposed method, the transient pressure and flow velocity are numerically predicted for a variable—property series pipe, and then the results are compared to the classical method of characteristics MOC.
Ali Triki; Further investigation on water-hammer control inline strategy in water-supply systems. This paper revisited the inline re-design strategy used for water-hammer control into an existing steel-piping water supply system to further promote a comprehensive exploration of the entire design driven parameters set, including pressure-head, circumferential-stress and radial-strain behaviors. This strategy consists of replacing a short-section of the transient sensitive region of the original piping system by another made of polymeric pipe-wall material. The 1-D unconventional water-hammer model embedding the Vitkovsky and the Kelvin—Voigt formulations was adopted to describe the flow behavior and solved by the Method of Characteristics MOC. The model was used to investigate two critical scenarios, including water-hammer up- and down-surge events. The effectiveness of the proposed strategy was evaluated for the high- or low-density polyethylene HDPE or LDPE material used for the replaced short-section pipe-wall. Results suggested that the utilized strategy could be successfully employed to amortize pressure-head and circumferential-stress rise and drop.
A common approach for flap monitoring is the use of acoustic Doppler sonography, in which the frequency of ultrasonic waves emitted from a probe changes in response to the underlying flap blood flow. These frequency variations result in sound production, mediating the interpretation of flap perfusion. Doppler sonography allows for an accurate assessment of arterial perfusion. It is less useful for venous assessment due to difficulties with interpretation and frequent absence of the venous signal. Nevertheless, careful attention to the arterial signal may offer subtle clues regarding the venous system. We present one such finding, which, though rarely discussed, is potentially invaluable in flap assessment.
Carey, Michael A. A sudden change in flow in a confined system results in the formation of a series of pressure pulses known as a water hammer. Pump shutdown or valve closure at the conclusion of a hydraulic fracture treatment frequently generates a water hammer, which sends a pressure pulse down the wellbore that interacts with the created fracture before returning towards the surface. The result is a pressure profile that consists of a series of oscillations that attenuate over time due to friction. Created hydraulic fractures have been shown to alter the period, amplitude, and duration of the water hammer signal. The goal of this study was to simulate the water hammer response of hydraulically fractured wells, and quantify how fractures affect the response.
Request PDF | A Review of Water Hammer Theory and Practice | Hydraulic transients in closed conduits have been a subject of both theoretical.
Carey, M. Chierici, G. Falk, K.
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Authors: I. Abuiziah , A. Oulhaj , K. Sebari , D. The primary objectives of transient analysis are to determine the values of transient pressures that can result from flow control operations and to establish the design criteria for system equipment and devices such as control devices and pipe wall thickness so as to provide an acceptable level of protection against system failure due to pipe collapse or bursting. Because of the complexity of the equations needed to describe transients, numerical computer models are used to analyze transient flow hydraulics. An effective numerical model allows the hydraulic engineer to analyze potential transient events and to identify and evaluate alternative solutions for controlling hydraulic transients, thereby protecting the integrity of the hydraulic system.
Hydraulic transients in closed conduits have been a subject of both theoretical stud intense practical interest for more than one hundred years.Dennis W. 07.06.2021 at 03:07
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