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Relevant bibliographies by topics / Disturbed flow

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Journal articles

Academic literature on the topic 'Disturbed flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Disturbed flow"

1

Laribi, Boualem, and Abdellah Abdellah Hadj. "Analysis of Turbulent Flow Development Downstream Disturbers with Perforated Plate Flow Conditioner." Applied Mechanics and Materials 197 (September 2012): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amm.197.73.

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This article discusses the development and the establishment of turbulent flow downstream of disturbers like a valve 50% open, valve 70% open, Tee and 90° double bend in perpendicular planes. Associated with these disturbers, a perforated plate flow conditioner is installed to examine his performances to produce the fully developed pipe flow as suggested by standards ISO5167 and AGA3. The study focused mainly on the numerical analysis of the velocity contours at several axial stations downstream the disturbers. For the simulation, code CFD Fluent was used. The study of the disturbed flow is examined with three Reynolds numbers. The results show a very good prediction of the CFD code Fluent for the flow development downstream the disturbers and conditioner which makes the code very efficient for conception of a new flow conditioner not described by the standards. It was also found that the valve 50% open could be considered a reference disturber for analyzing the development of turbulent flows. As interesting results, is the effectiveness of the perforated plate to produce the flow developed pipe flow at about z/D=10 downstream the disturber. This result is very important for flow measurement accuracy as suggested by the standards. An experimental study is needed to validate these results.

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2

Gersten, K. "Flow metering with disturbed inflow." Acta Mechanica 201, no. 1-4 (2008): 13–22. http://dx.doi.org/10.1007/s00707-008-0068-9.

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3

Chu, Miao, Clemens von Birgelen, Yingguang Li, et al. "Quantification of disturbed coronary flow by disturbed vorticity index and relation with fractional flow reserve." Atherosclerosis 273 (June 2018): 136–44. http://dx.doi.org/10.1016/j.atherosclerosis.2018.02.023.

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4

Efird, K. D. "Disturbed Flow and Flow-Accelerated Corrosion in Oil and Gas Production." Journal of Energy Resources Technology 120, no. 1 (1998): 72–77. http://dx.doi.org/10.1115/1.2795013.

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The effect of fluid flow on corrosion of steel in oil and gas environments involves a complex interaction of physical and chemical parameters. The basic requirement for any corrosion to occur is the existence of liquid water contacting the pipe wall, which is primarily controlled by the flow regime. The effect of flow on corrosion, or flow-accelerated corrosion, is defined by the mass transfer and wall shear stress parameters existing in the water phase that contacts the pipe wall. While existing fluid flow equations for mass transfer and wall shear stress relate to equilibrium conditions, disturbed flow introduces nonequilibrium, steady-state conditions not addressed by these equations, and corrosion testing in equilibrium conditions cannot be effectively related to corrosion in disturbed flow. The problem in relating flow effects to corrosion is that steel corrosion failures in oil and gas environments are normally associated with disturbed flow conditions as a result of weld beads, pre-existing pits, bends, flanges, valves, tubing connections, etc. Steady-state mass transfer and wall shear stress relationships to steel corrosion and corrosion testing are required for their application to corrosion of steel under disturbed flow conditions. A procedure is described to relate the results of a corrosion test directly to corrosion in an operation system where disturbed flow conditions are expected, or must be considered.

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5

THEOFANOUS, T. G., G. J. LI, T. N. DINH, and C. H. CHANG. "Aerobreakup in disturbed subsonic and supersonic flow fields." Journal of Fluid Mechanics 593 (November 23, 2007): 131–70. http://dx.doi.org/10.1017/s0022112007008853.

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This work concerns the breakup of millimetre-scale liquid droplets in gaseous flow fields that are disturbed from free-stream conditions by the presence of solid obstacles or other drops. A broad range of flow conditions is considered – from subsonic to supersonic, from highly rarefied to ambient pressures, and from fixed cylindrical obstacles to free liquid droplets (as obstacles). The liquid is water or tributyl phosphate, a water-like low-viscosity fluid of very low vapour pressure. We present data on deformation and breakup regimes, and, aided by numerical simulations, we discuss governing mechanisms and the time scaling of these events. Thereby a methodology is demonstrated for conveniently forecasting first-order behaviours in disturbed flow fields more generally. The highly resolved images lend themselves to testing/benchmarking numerical simulations of interfacial flows. These results, along with the experimental capability developed, constitute one of the key building blocks for our overall long-term aim towards predicting ultimate particle-size distributions from such intense aerodynamic interactions involving very large quantities of Newtonian and viscoelastic liquids.

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6

Chiu, J. J., D. L. Wang, S. Chien, R. Skalak, and S. Usami. "Effects of Disturbed Flow On Endothelial Cells." Journal of Biomechanical Engineering 120, no. 1 (1998): 2–8. http://dx.doi.org/10.1115/1.2834303.

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Atherosclerotic lesions tend to localize at curvatures and branches of the arterial system, where the local flow is often disturbed and irregular (e.g., flow separation, recirculation, complex flow patterns, and nonuniform shear stress distributions). The effects of such flow conditions on cultured human umbilical vein endothelial cells (HUVECs) were studied in vitro by using a vertical-step flow channel (VSF). Detailed shear stress distributions and flow structures have been computed by using the finite volume method in a general curvilinear coordinate system. HUVECs in the reattachment areas with low shear stresses were generally rounded in shape. In contrast, the cells under higher shear stresses were significantly elongated and aligned with the flow direction, even for those in the area with reversed flow. When HUVECs were subjected to shearing in VSF, their actin stress fibers reorganized in association with the morphological changes. The rate of DNA synthesis in the vicinity of the flow reattachment area was higher than that in the laminar flow area. These in vitro experiments have provided data for the understanding of the in vivo responses of endothelial cells under complex flow environments found in regions of prevalence of atherosclerotic lesions.

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7

Xu, Qingbo. "Disturbed Flow-Enhanced Endothelial Turnover in Atherosclerosis." Trends in Cardiovascular Medicine 19, no. 6 (2009): 191–95. http://dx.doi.org/10.1016/j.tcm.2009.12.002.

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8

Kheshgi, Haroon S., and L. E. Scriven. "Disturbed film flow on a vertical plate." Physics of Fluids 30, no. 4 (1987): 990. http://dx.doi.org/10.1063/1.866286.

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9

Chien, Shu. "Effects of Disturbed Flow on Endothelial Cells." Annals of Biomedical Engineering 36, no. 4 (2008): 554–62. http://dx.doi.org/10.1007/s10439-007-9426-3.

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10

Qi, Wei Dong, Jin Chun Song, and Guang An Ren. "Analysis on Gas Flow Field in Bell-Type Annealing Furnace by Using FLUENT." Applied Mechanics and Materials 345 (August 2013): 581–85. http://dx.doi.org/10.4028/www.scientific.net/amm.345.581.

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Because temperature decreases sharply, expansion caused by heat and contraction caused by cold are evident, the air in furnace is disturbed greatly and the zone of negative pressure may appear during bell-type furnace annealing. The zone can cause external air permeating the furnace and make steel coil annealed. Therefore it is necessary to analyse the flow field of protective gas in furnace during cooling, whether the air zone of negative pressure can form, the location of the zone and the methods of eliminating the zone. In addition, splitter plate disturbs the flow of gas and its effect on disturbed air is also analyzed. This paper analyses flow field in bell-type annealing furnace by using FLUENT, whether the zone of negative pressure exists and its location.

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