Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Pressure Transients"”.
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Detection and Localization of Pressure Transients in Water Distribution Systems
… investigates the effectiveness of continuous pressure monitoring systems in detecting pipe bursts and transient events within water distribution systems. Using PTSNet, a parallel transient simulation Python package, we simulate pipe burst events at each node in a real-world system and examine …
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Physically modeling and mathematically simulating pressure transients in transfer lines
… the physical system were the fluctuation in tank pressure over the test duration and the correlation between tank pressure and the loss coefficient of the main solenoid valve. The higher the pressure the lower the loss coefficient across the valve. The mathematical model did not account for losses …
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Pressure transients in a ruptured gas pipeline with friction and thermal effects included
… from first principles which mathematically model pressure transients in a non-perfect gas. A constant value steady-flow friction factor was used to calculate the frictional losses which was considered to be a reasonable approach since it would not be possible to account for all the variations in …
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A study of column separation accompanying pressure transients in an aviation kerosene pipeline
… the partial differential equations governing pressure transient propagation. Particular attention was given to obtaining accurate velocity results at the instant the predicted pressure at a section reached vapour pressure. A test rig utilizing L.56 aluminium alloy fuel piping and other …
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Experimental study of rapid pressure transients in a two-fluid, two-phase system and comparison to RELAP5
… development of accurate closure relations. Fast transients can be particularly difficult to model, so experimental datasets are important for developing closure relations that apply to these scenarios. Previously, experiments like the Edwards pipe experiment (ISL, 2010) and the pipe experiment by …
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Transient flow of a slurry
The effect of solid particles on pressure transients produced by flow changes was studied. Water slurries of finely ground limestone were used at concentrations of 10%, 20%, 30%, and 35% by volume in experimental runs in a 2" pipeline. The experimental results were compared to computer simulations …
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Regional-Scale Impacts of Fluid Composition and Geologic Structure for Injection-Induced Seismicity in the Southern U.S. Midcontinent
… disposal, particularly into the regionally underpressured Arbuckle Group. The Arbuckle is hydraulically connected to Precambrian basement through an extensive fracture system, which transmits pressure perturbations from wastewater injections to seismogenic depths. Previous studies have …
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Addressing climate-driven challenges in groundwater management and coastal hydrogeology through numerical modeling
… Numerical models show that injections can induce pressure transients in basement rock, potentially triggering seismicity, but gradual injection increases help mitigate this risk. The Hampton Roads Seismic Network (HRSN) was established to monitor for induced seismicity, and a novel assessment …
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An investigation of cochlear dynamics in surgical and implanation processes
… and behaviour of the fluid, structure and pressure transients within the cochlea. The investigation has been complemented by an innovative experimental technique developed to evaluate the dynamics in the cochlear fluids while maintaining the integrity of the cochlear structure. This …
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Use of hydraulic tests to identify conceptual models of heterogeneity for fractured rock aquifers
… flow dimension, and the regime of diffusion of pressure transients of aquifer tests (e.g., Fickian or non-Fickian). Results demonstrate that the DFN model is the best candidate to represent the heterogeneity of fractured rock aquifers. In particular for the DFN model, the apparent flow dimension …
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The cavitation subharmonic signal : mechanistic source and optimised detection
… driving, however, at intervals dependent on the pressure amplitude of the driving, the cloud undergoes strong collapses, coincident to emitting a shockwave. In parallel to the high-speed imaging, a number of hydrophone detectors are used to collect the acoustic emissions, and confirm that …
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Uncertainty reduction in reservoir parameters prediction from multiscale data using machine learning in deep offshore reservoirs.
… saturation, permeability (and their variants), pressure, wettability, bulk modulus, Young modulus, shear modulus, fracture gradient - cannot be directly measured and, if measured, are available only at small number of well locations. The limited data are then combined with geological …
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Common cyclicities in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River
… between repetitive mechanical effects of pore pressure transients and seismicity in the Charlevoix seismic zone. The temporal behavior of the physical processes studied is in general agreement with the Hydroseismicity model.
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Simulating and diagnosing three-dimensional multistage hydraulic fracturing with the generalized finite element method
… near a wellbore and its impact on fracturing pressures remain an open problem. In this work, a Generalized Finite Element Method (GFEM) is proposed for the simulation of the hydraulic fracturing process. A distinctive feature of the method is the fact that the mesh does not need to conform to …
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Two Issues in Premise Plumbing: Contamination Intrusion at Service Line and Choosing Alternative Plumbing Material
… valves and tanks) is susceptible to hydraulic transients resulting in high and low pressure waves alternatively passing through the network. While both low and high pressure events structurally tax the already weak system, there is copious evidence indicating intrusion of contaminants into the …
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Numerical simulations of magma chamber dynamics at Campi Flegrei, and associated seismicity, deformation and gravity changes
… of local conditions of magma composition, pressure and temperature.The model features enable to study a broad range of phenomenologies characterizing pre and sin-eruptive magma dynamics in a wide domain from the volcanic crater to deep magma feeding zones. The study of displacement field …