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Letteratura scientifica selezionata sul tema "Shear flow effects"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Shear flow effects"

1

Kuroda, Mitsutoshi. "Effects of Crystallographic Texture on Plastic Flow Localization". Key Engineering Materials 340-341 (giugno 2007): 211–16. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.211.

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In this study, effects of typical texture components observed in rolled aluminum alloy sheets (i.e. Copper, Brass, S, Cube and Goss texture components) on plastic flow localization are studied. The material response is described by a generalized Taylor-type polycrystal model, in which each grain is characterized in terms of an elastic-viscoplastic continuum slip constitutive relation. First, forming limits of thin sheet set by sheet necking are predicted using a Marciniak–Kuczynski (M–K-) type approach. It is shown that only the Cube texture component yields forming limits higher than that for a random texture in the biaxial stretch range. Next, three-dimensional shear band analyses are performed, using a three-dimensional version of M–K-type model, but the overall deformation mode is restricted to a plane strain state. From this simple model analysis, two important quantities regarding shear band formation are obtained: i.e. the critical strain at the onset of shear banding and the corresponding orientation of shear band. It is concluded that the Cube texture component is said to be a shear band free texture, while some texture components exhibit significantly low resistance to shear band formation. Finally, shear band developments in plane strain pure bending of sheet specimens with the typical textures are studied.

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2

Smith, Ronald. "Buoyancy effects in vertical shear dispersion". Journal of Fluid Mechanics 242 (settembre 1992): 371–86. http://dx.doi.org/10.1017/s0022112092002416.

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Density gradients modify the flow and hence the shear dispersion of one miscible fluid in another. A solution procedure is given for calculating the effects of weak buoyancy for vertical laminar parallel shear flows. A particular extrapolation to large buoyancy gives an exactly solvable nonlinear diffusion equation. For the particular case of vertical plane Poiseuille flow explicit formulae are derived for the flow, for the nonlinear shear dispersion coefficient and for the onset of instability. The exactly solvable model gives reasonably accurate results for the buoyancy-modified shear dispersion over a range from half to one-and-a-half times the non-buoyant value.

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3

Chiu, J. J., D. L. Wang, S. Chien, R. Skalak e S. Usami. "Effects of Disturbed Flow On Endothelial Cells". Journal of Biomechanical Engineering 120, n. 1 (1 febbraio 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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4

Murata, T., e T. W. Secomb. "Effects of shear rate on rouleau formation in simple shear flow". Biorheology 25, n. 1-2 (1 aprile 1988): 113–22. http://dx.doi.org/10.3233/bir-1988-251-218.

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5

Conway, Daniel E., Marcie R. Williams, Suzanne G. Eskin e Larry V. McIntire. "Endothelial cell responses to atheroprone flow are driven by two separate flow components: low time-average shear stress and fluid flow reversal". American Journal of Physiology-Heart and Circulatory Physiology 298, n. 2 (febbraio 2010): H367—H374. http://dx.doi.org/10.1152/ajpheart.00565.2009.

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To simulate the effects of shear stress in regions of the vasculature prone to developing atherosclerosis, we subjected human umbilical vein endothelial cells to reversing shear stress to mimic the hemodynamic conditions at the wall of the carotid sinus, a site of complex, reversing blood flow and commonly observed atherosclerosis. We compared the effects of reversing shear stress (time-average: 1 dyn/cm2, maximum: +11 dyn/cm2, minimum: −11 dyn/cm2, 1 Hz), arterial steady shear stress (15 dyn/cm2), and low steady shear stress (1 dyn/cm2) on gene expression, cell proliferation, and monocyte adhesiveness. Microarray analysis revealed that most differentially expressed genes were similarly regulated by all three shear stress regimens compared with static culture. Comparisons of the three shear stress regimens to each other identified 138 genes regulated by low average shear stress and 22 genes regulated by fluid reversal. Low average shear stress induced increased cell proliferation compared with high shear stress. Only reversing shear stress exposure induced monocyte adhesion. The adhesion of monocytes was partially inhibited by the incubation of endothelial cells with ICAM-1 blocking antibody. Increased heparan sulfate proteoglycan expression was observed on the surface of cells exposed to reversing shear stress. Heparinase III treatment significantly reduced monocyte adhesion. Our results suggest that low steady shear stress is the major impetus for differential gene expression and cell proliferation, whereas reversing flow regulates monocyte adhesion.

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6

Toppaladoddi, S., e J. S. Wettlaufer. "The combined effects of shear and buoyancy on phase boundary stability". Journal of Fluid Mechanics 868 (17 aprile 2019): 648–65. http://dx.doi.org/10.1017/jfm.2019.153.

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We study the effects of externally imposed shear and buoyancy driven flows on the stability of a solid–liquid interface. A linear stability analysis of shear and buoyancy-driven flow of a melt over its solid phase shows that buoyancy is the only destabilizing factor and that the regime of shear flow here, by inhibiting vertical motions and hence the upward heat flux, stabilizes the system. It is also shown that all perturbations to the solid–liquid interface decay at a very modest shear flow strength. However, at much larger shear-flow strength, where flow instabilities coupled with buoyancy might enhance vertical motions, a re-entrant instability may arise.

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7

Chen, Y. C., Y. Q. Qin, G. Y. Sun, G. Dong, Y. Xiao e Z. Lin. "Effects of radial electric field on kinetic ballooning mode in toroidal plasma". Physics of Plasmas 30, n. 2 (febbraio 2023): 022302. http://dx.doi.org/10.1063/5.0131294.

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Global gyrokinetic particle simulations show that the radial electric field ( Er) shear can suppress the kinetic ballooning mode (KBM) in a toroidal plasma. The linear KBM growth rate reaches a maximum when the toroidal rotation induced by the ion diamagnetic shear is canceled by the E × B flow shear. High toroidal-mode-number (high- n) KBMs are more sensitive to the Er shear than low- n KBMs. Nonlinear simulations find that both the Er shear and a self-generated zonal flow can reduce the nonlinear KBM saturation level with smaller particle and ion heat transport. Meanwhile, the zonal flow can weaken the suppressing effects of the Er shear on KBM nonlinear saturation amplitude. The radial correlation length of the turbulence is reduced by the Er shear and the zonal flow.

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Popova, A. V., O. V. Sheremetyeva, M. E. Bobrova e A. S. Perezhogin. "Non-local deformation effects in shear flows". Nonlinear Processes in Geophysics Discussions 2, n. 1 (21 gennaio 2015): 69–96. http://dx.doi.org/10.5194/npgd-2-69-2015.

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Abstract. The method for detection of clusters on the basis of event space–time dependence is classically applied for foreshock–mainshock–aftershock sequences for which event connectedness is generally accepted. In the paper, this approach is used to investigate the whole event catalogue of foreshock and aftershock sequences filtered from the events with small magnitudes, in which connected events are also determined. The space scale is extended due to the inclusion of the parameter of seismic event connectedness in the direction of dislocation shift that allows us to consider the obtained connected events as clusters in a shear flow. A statistical model of the shear flow was constructed by catalogue decomposition into timescales and space scales defined analytically. A modelling algorithm of the shear flow was developed and its stability to initial condition change was investigated. Shear flow structure and arising non-local deformation characteristics which may be the criteria for dynamic process activity in the considered subduction zone of the Kuril–Kamchatka island arc were analysed.

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9

Akao, Takumi, Tomoaki Watanabe e Koji Nagata. "Vertical confinement effects on a fully developed turbulent shear layer". Physics of Fluids 34, n. 5 (maggio 2022): 055129. http://dx.doi.org/10.1063/5.0090686.

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The effects of vertical confinement on a turbulent shear layer are investigated with large-eddy simulations of a freely developing shear layer (FSL) and a wall-confined shear layer (WSL) that develops between two horizontal walls. In the case of the WSL, the growth of the shear layer is inhibited by the walls. Once the walls prevent the development of the shear layer, highly anisotropic velocity fluctuations become prominent in the flow. These anisotropic velocity fluctuations are recognized as elongated large-scale structures (ELSS), whose streamwise length is much larger than the length scales in the other directions. Spectral analysis confirms that the turbulent kinetic energy is dominated by the ELSS, whose streamwise length grows continuously. A proper orthogonal decomposition can effectively extract a velocity component associated with the ELSS. The isotropy of the Reynolds stress tensor is changed by the presence of the ELSS. These changes in flow characteristics due to the ELSS are not observed in the FSL, where the shear layer thickness increases continuously. These behaviors of the WSL are consistent with those of stably stratified shear layers (SSSLs), where flow structures similar to ELSS also develop when the vertical flow development is confined by the stable stratification. The vertical confinement by the walls or stable stratification strengthens mean shear effects. The flow behavior at large scales in the WSL and SSSL is consistent with rapid distortion theory for turbulence subject to mean shear, suggesting that the development of ELSS is caused by the mean shear.

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Ayukawa, K., J. Ochi, G. Kawahara e T. Hirao. "Effects of shear rate on the flow around a square cylinder in a uniform shear flow". Journal of Wind Engineering and Industrial Aerodynamics 50 (dicembre 1993): 97–106. http://dx.doi.org/10.1016/0167-6105(93)90065-v.

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Più fonti

Tesi sul tema "Shear flow effects"

1

Doty, Sherry D. "Fluid shear stress effects on fibronectin in endothelial cells". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19073.

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2

Zhou, Fangbin. "Inertial effects upon suspension shear flows : instability issue". Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/10056.

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3

Helmlinger, Gabriel. "Effects of pulsatile laminar shear stress on cultured vascular endothelial cells". Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/16738.

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4

Baker, William John Jr. "The effects of population doubling on the shear stress response of bovin aortic endothelial cells". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/19600.

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5

Akbary, Hamid. "Effects of extra strain rates on uniform shear flow and their relevance to impeller flows". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23857.pdf.

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6

Shuaib, Norshah Hafeez. "Numerical simulation of thin film flow including surface shear and gravitational effects". Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420340.

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7

Drumright-Clarke, Mary Ann. "Numerical simulations that characterize the effects of surfactant on droplets in shear flow". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26895.

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Numerical simulations utilizing the code SURFER++ with the incorporation of an insoluble surfactant in the VOF scheme were conducted to characterize the effects of surfactant on a drop in shear flow. The drop is suspended in a matrix liquid. A parameter called reduction, which specifically relates to a percentage decrease in effective surface tension, is used to measure the surfactant amount on the interface. In a model system where reduction = 0.1, viscosity ratio = 1 and density ratio = 1, it was found that stable drops tend to be more elongated and less inclined to the primary flow direction than drops unexposed to surfactant. This can be explained by the location of surfactant at the interface as the drop evolves. Breaking drops also show a flattened angle, but exhibit shorter necks and faster time to break than similar drops without surfactant. As reduction increases, various physical characteristics of the drops change across Reynolds number.
Ph. D.

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8

Magid, Richard. "Engineering molecular reporters to investigate the effects of shear stress upon endothelial cells". Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13754.

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9

Ziegler, Thierry. "Effects of a laminar steady-state flow-induced shear stress on the proliferation of cultured endothelial cells". Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17663.

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10

Mehrabadi, Marmar. "Effects of red blood cells and shear rate on thrombus growth". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53082.

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Thrombosis formation upon rupture or erosion of an atherosclerotic plaque can lead to occlusion of arteries. An occlusive thrombus is the most common cause of clinical events such as angina, myocardial infarction, ischemic attacks and strokes. Occlusive thrombi can cause ischemic cardiac arrest in less than an hour. Thrombosis formation requires rapid platelet accumulation rates exceeding thrombosis lysis and embolization rates. Hemodynamics greatly affects platelet accumulation rate through affecting platelet transport to the surface of a growing thrombus. The presence of red blood cells (RBCs) in blood increases platelet transport rate by several orders of magnitude compared to transport due to Brownian motion. Margination of platelets towards the vessel walls also results in higher platelet concentration at the RBC-depleted layer relative to the bulk. In this thesis, we studied the effects of hemodynamics on thrombus growth. We investigated the effects of important flow and particle properties on margination of particles in RBC suspensions by direct numerical simulation (DNS) of cellar blood flow. We derived a scaling law for margination length. Based on this scaling law, margination length increases cubically with channel height and is independent of shear rate. Using DNS, we verified the proposed scaling law for margination length in straight channels. We also showed that rigidity and size both lead to particle margination. We show that platelet margination can be explained by RBC-enhanced shear-induced diffusion of platelets in the RBC-filled region combined with platelet trapping in the RBC-free region. A simple continuum model is introduced based on the proposed mechanism. Using an experimental correlation for effective diffusivity in blood, the continuum model can recover experimental results from the literature over a wide range of tube diameters. We created an in vitro experimental model of thrombosis with and without RBCs. Surprisingly, we found that rapid thrombus growth does not require enhanced platelet transport in the presence of RBCs at high shear. Instead, our results suggest that thrombus growth rate at high shear is dependent on the availability of vWF-A1 domains as opposed to convective transport of platelets. Finally, we obtained empirical correlations for thrombus growth and lag time based on flow parameters by using an in vitro model of thrombosis. We developed a simple model for predicting thrombus formation using the obtained empirical correlations. We demonstrated the capability of the model in predicting thrombus formation over a wide range of experimental geometries. This model may be useful for designing blood-contacting devices to avoid unwanted thrombosis.

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Più fonti

Libri sul tema "Shear flow effects"

1

Mankbadi, R. R. Effects of core turbulence on jet excitability. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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2

Haw, Richard C. The effects of forcing on a single stream shear layer and its parent boundary layer. East Lansing, MI: College of Engineering, Michigan State University, 1990.

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3

M, Abbott John, e United States. National Aeronautics and Space Administration., a cura di. Control of flow separation and mixing by aerodynamic excitation. [Washington, D.C.]: NASA, 1990.

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4

M, Abbott John, e United States. National Aeronautics and Space Administration., a cura di. Control of flow separation and mixing by aerodynamic excitation. [Washington, D.C.]: NASA, 1990.

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5

United States. National Aeronautics and Space Administration., a cura di. Analysis of the leading edge effects on the boundary layer transition: Technical report, March 1, 1984 - August 31, 1990. [Washington, DC: National Aeronautics and Space Administration, 1990.

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6

Sarkar, Shondeep L. The stabilizing effect of compressibility in turbulent shear flow. Hampton, Va: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

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7

Shen, Hayley H. Effect of nonuniform size on internal stresses in a rapid, simple shear flow of granular materials. [Hanover, N.H.]: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1985.

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8

Brok, Sebastianus Willem Josef den. An experimental investigation into the effect of water on the flow of quartzite =: Experimenteel onderzoek naar het effekt van water op het vloeigedrag van kwartsiet. [Utrecht: Faculteit Aardwetenschappen der Rijksuniversiteit te Utrecht, 1992.

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9

E, Kelly R., e United States. National Aeronautics and Space Administration., a cura di. Effect of density gradients in confined supersonic shear layers. [Washington, DC: National Aeronautics and Space Administration, 1994.

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10

Chang, Tony H. D. Effects of interfacial level gradient and channel slope on interfacial shear stress in near-horizontal stratified gas-liquid flows. Ottawa: National Library of Canada, 1993.

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Capitoli di libri sul tema "Shear flow effects"

1

Jou, David, José Casas-Vázquez e Manuel Criado-Sancho. "Non-equilibrium Chemical Potential and Shear-Induced Effects". In Thermodynamics of Fluids Under Flow, 103–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04414-8_5.

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2

Thomas, Neale, K. Sanaullah e X. Yang. "Buoyancy Profile Effects in Inclined Bubbly Shear Flow". In Advances in Turbulence VI, 567–70. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_161.

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3

Milner, Scott T. "Effects of Shear Flow on Semidilute Polymer Solutions". In Theoretical Challenges in the Dynamics of Complex Fluids, 127–40. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5480-2_9.

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4

Gomes, Luciana C., Rita Teixeira-Santos, Maria J. Romeu e Filipe J. Mergulhão. "Bacterial Adhesion and Biofilm Formation: Hydrodynamics Effects". In Urinary Stents, 225–43. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_19.

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AbstractThe effectiveness of biomedical surfaces may be highly affected by the hydrodynamic condition. Surfaces releasing antimicrobial substances when exposed to flow may exhibit shorter lifetimes than at static conditions. Likewise, depending on the fluid flow surrounding the surface, contact-killing surfaces that are adhesive for bacterial cells may be covered by bacterial debris, which decreases their antimicrobial activity. To evaluate the anti-adhesive and antimicrobial performance of novel biomedical materials, a number of flow devices have been designed to recreate in vivo flow conditions. Shear stress and flow rate can be accurately controlled and varied in these in vitro flow systems, which requires prior knowledge of the flow dynamics inside the platform. After limiting their operational range, modified Robbins devices, flow chambers and microfluidic devices are suggested as experimental setups to mimic the flow behavior in urinary catheters and stents.

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Jou, David, José Casas-Vázquez e Manuel Criado-Sancho. "Non-equilibrium Chemical Potential and Shear-Induced Effects in Polymer Solutions and Blends". In Thermodynamics of Fluids Under Flow, 123–53. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0199-1_6.

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6

Barge, A., e M. A. Gorokhovski. "Effects of Regenerating Cycle on Lagrangian Acceleration in Homogeneous Shear Flow". In Turbulent Cascades II, 51–58. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12547-9_7.

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7

Tarbell, J. M., M. Klanchar e A. Dutta. "Effects of Phase Relationships on Wall Shear Stress in Curved and Straight Elastic Artery Models". In Role of Blood Flow in Atherogenesis, 103–8. Tokyo: Springer Japan, 1988. http://dx.doi.org/10.1007/978-4-431-68399-5_15.

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8

Yu, Jian-qiang, Qi Li, Yong-lu Wang e Shuai Tao. "Numerical Simulation of Rockburst Characteristics of Tunnel Surrounding Rock Under Dilatancy Effect". In Advances in Frontier Research on Engineering Structures, 163–73. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_15.

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AbstractRockburst is one of the most intense reactions in various instability phenomena of underground cavern surrounding rock, which seriously threatens the safety of underground engineering construction personnel and equipment. Based on Mohr–Coulomb strain softening model, the non-associated flow rule is adopted for plastic flow after material yield. By implanting Gu Ming-cheng and Tao Zhen-yu rockburst criterion in the software, the effects of different dilatancy angles on rockburst grade and circumferential stress distribution of surrounding rock of circular tunnel are simulated. The calculation results show that the larger the dilatancy angle is, the more difficult the rock burst pit is to form. The elements of serious rockburst are mainly concentrated in the wall of the tunnel, and the shear bands formed in the high value area of shear strain increment are short. When the dilatancy angle is small, the circumferential stress reaches the maximum at the interface of elastic-plastic zone. With the increase of dilatancy angle, the number of elements entering the plastic state and occurring medium and severe rockburst increases first and then decreases, while the number of elements occurring slight rockburst decreases monotonously. Different dilatancy angles have significant effects on the number of elements occurring rockburst at all levels.

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9

Komori, S., e R. Kurose. "The Effects of Shear and Spin on Particle Lift and Drag in a Shear Flow at High Reynolds Numbers". In Advances in Turbulence VI, 551–54. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_157.

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10

Panin, Viktor E., Valery E. Egorushkin e Natalya S. Surikova. "Influence of Lattice Curvature and Nanoscale Mesoscopic Structural States on the Wear Resistance and Fatigue Life of Austenitic Steel". In Springer Tracts in Mechanical Engineering, 225–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_11.

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AbstractThe gauge dynamic theory of defects in a heterogeneous medium predicts the nonlinearity of plastic flow at low lattice curvatureand structural turbulence with the formation of individual dynamic rotations at high curvature of the deformed medium. The present work is devoted to the experimental verification of the theoretical predictions. Experimentally studied are the influence of high-temperature radial shear rolling and subsequent cold rolling on the internal structure of metastable Fe–Cr–Mn austenitic stainless steel, formation of nonequilibrium ε- and α′-martensite phases, appearance of dynamic rotations on fracture surfaces, fatigue life in alternating bending, and wear resistance of the material. Scratch testing reveals a strong increase in the damping effect in the formed hierarchical mesosubstructure. The latter is responsible for a nanocrystalline grain structure in the material, hcp ε martensite and bcc α′ martensite in grains, a vortical filamentary substructure on the fracture surface as well as for improved high-cycle fatigue and wear resistance of the material. This is related to a high concentration of nanoscale mesoscopic structural states, which arise in lattice curvature zones during high-temperature radial shear rolling combined with smooth-roll cold rolling. These effects are explained by the self-consistent mechanical behavior of hcp ε-martensite laths in fcc austenite grains and bcc α′-martensite laths that form during cold rolling of the steel subjected to high-temperature radial shear rolling.

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Atti di convegni sul tema "Shear flow effects"

1

MANKBADI, REDA, EDWARD RICE e GANESH RAMAN. "Effects of core turbulence on jet excitability". In 2nd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-966.

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2

HASSAN, A., e L. SANKAR. "Separation control using moving surface effects - A numerical simulation". In 2nd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-972.

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3

SEIFERT, A., A. DARABY, B. NISHRI e I. WYGNANSKI. "The effects of forced oscillations on the performance of airfoils". In 3rd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3264.

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4

JOHANSEN, J., e C. SMITH. "The effects of cylindrical surface modifications on turbulent boundary layers". In Shear Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-547.

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5

DEVENPORT, W., M. DEWITZ, N. AGARWAL, R. SIMPSON e K. PODDAR. "Effects of a fillet on the flow past a wing body junction". In 2nd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-986.

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6

ROSHKO, A., e F. ROBERTS. "Effects of periodic forcing on mixing in turbulent shear layers and wakes". In Shear Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-570.

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7

GATSKI, T., e A. SAVILL. "An analysis of curvature effects for the control of wall-bounded shear flows". In 2nd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-1014.

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8

MO, J., e M. DUKE, JR. "An investigation of the effects of a rear stagnation jet on the wakebehind a cylinder". In 3rd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3274.

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9

LANDAHL, M., e D. HENNINGSON. "The effects of drag reduction measures on boundary layer turbulence structure - Implications of an inviscid model". In Shear Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-560.

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10

CHYU, WEI, MARK RIMLINGER e TOM SHIH. "Effects of bleed-hole geometry and plenum pressure on three-dimensional shock-wave/boundary-layer/bleed interactions". In 3rd Shear Flow Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3259.

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Rapporti di organizzazioni sul tema "Shear flow effects"

1

Tajima, T., W. Horton, J. Q. Dong e Y. Kishimoto. Shear flow effects on ion thermal transport in tokamaks. Office of Scientific and Technical Information (OSTI), marzo 1995. http://dx.doi.org/10.2172/42486.

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2

Artun, M., J. V. M. Reynders e W. M. Tang. Integral eigenmode analysis of shear flow effects on the ion temperature gradient mode. Office of Scientific and Technical Information (OSTI), luglio 1993. http://dx.doi.org/10.2172/7368752.

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3

Artun, M., J. V. M. Reynders e W. M. Tang. Integral eigenmode analysis of shear flow effects on the ion temperature gradient mode. Office of Scientific and Technical Information (OSTI), luglio 1993. http://dx.doi.org/10.2172/10171889.

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4

Dahl, Travis, Justin Giles, Kathleen Staebell, David Biedenharn e Joseph Dunbar. Effects of geologic outcrops on long-term geomorphic trends : New Madrid, MO, to Hickman, KY. Engineer Research and Development Center (U.S.), luglio 2021. http://dx.doi.org/10.21079/11681/41086.

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The Mississippi River between New Madrid, MO, and Hickman, KY, is of particular interest because of divergent trends in water surface profiles at the upstream and downstream ends of the reach. This report documents the investigation of the bathymetry, geology, and hydraulics of this segment of the river. The report shows that the area near River Mile 901 above Head of Passes strongly affects the river stages at low flows. This part of the river can experience high shear stresses when flows fall below 200,000 cfs, as opposed to most other locations where shear stress increases with flow. One-dimensional hydraulic modeling was also used to demonstrate that an increase of depth at a single scour hole, such as the one downstream from Hickman near River Mile 925, is unlikely to cause reach-wide degradation.

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5

Brennan, Dylan P. Flow Shear Effects in the Onset Physics of Resistive MHD Instabilities in Tokamaks. Final report. Office of Scientific and Technical Information (OSTI), aprile 2013. http://dx.doi.org/10.2172/1093495.

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6

Johnson. L51582 Scaling of Multiphase Pipe Flow Behavior at High Gas Density. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 1988. http://dx.doi.org/10.55274/r0010628.

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This report contains data that demonstrates the scaling of flow regime, pressure drop, and holdup multiphase flow with pipe diameter. In addition, entrance length effects, the onset of liquid entrainment, and interfacial shear modeling at high gas density were studied for purposes of validating multiphase flow design methods. Stratified, slug and annual flow regimes were observed in a 112-foot long 3.5-inch diameter test section. Air, freon, and water were used to represent pipeline fluids.

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7

Guo, Fan. Collaborative Research: Effects of the magnetic field shear and flow shear on the kinetic physics and particle acceleration in relativistic magnetic reconnection (Final Report). Office of Scientific and Technical Information (OSTI), gennaio 2023. http://dx.doi.org/10.2172/1960045.

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8

Moss, Robb, Tristan Gebhart, David Frost e Christian Ledezma. Flow-Failure Case History of the Las Palmas, Chile, Tailings Dam. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, gennaio 2019. http://dx.doi.org/10.55461/gvif2980.

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This report documents the flow failure of the Las Palmas tailings dam that was induced by the 27 February 2010 Maule Chile M8.8 earthquake. The Las Palmas site is located in Central Chile in Region VII near the town of Talca. Construction of the tailings dam occurred between 1998 as part of a gold mining operation and was no longer in active use. The ground shaking from the earthquake induced liquefaction of the saturated tailings material and resulted in a flow failure that ran out upwards of 350 m, flowing downslope in two directions. This report is broken into three sections: A summary of the construction and flow failure of the Las Palmas tailings dam; Details on the field investigations at the site, including the 2010 GEER reconnaissance, 2011 litigation support [DICTUC 2012], and the recent PEER–NGL-funded 2017 investigation; and Back-analysis of the flow failure by Gebhart [2016] to estimate the residual strength. The goal of this work is to provide a “high-quality” flow-failure case history to augment the existing database. The existing database is composed of roughly thirty case histories of varying quality (e.g., Weber et al. [2015] and Kramer and Wang [2015]). Herein, the term “high-quality” means that the in situ measurements were made in a controlled and repeatable manner, and that the back-analysis of the residual strength was performed considering static and dynamic effects of the slide mass. The results from this research indicate that the median back-analyzed residual strength of the liquefied material is ~8.3 kPa (~173 psf) at a pre-earthquake vertical effective stress of 2 atm (~200 kpa or 4000 psf), which is correlated to a median SPT blow count of N1,60~2.5, a median CPT tip resistance of qc1~1.3 MPa, and a median shear-wave velocity of VS1~172 m/sec. The back analyzed residual strength has a nominal coefficient of variation of 5.5% determined using a sensitivity analysis.

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Chu, M. S., J. M. Greene, T. H. Jensen, R. L. Miller, A. Bondeson, R. W. Johnson e M. E. Mauel. Effect of toroidal plasma flow and flow shear on global MHD modes. Office of Scientific and Technical Information (OSTI), gennaio 1995. http://dx.doi.org/10.2172/10118062.

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10

Bradford, Joe, Itzhak Shainberg e Lloyd Norton. Effect of Soil Properties and Water Quality on Concentrated Flow Erosion (Rills, Ephermal Gullies and Pipes). United States Department of Agriculture, novembre 1996. http://dx.doi.org/10.32747/1996.7613040.bard.

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Concentrated flow erosion in rills, pipes, ephermal gullies, and gullies is a major contributor of downstream sedimentation. When rill or gullies form in a landscape, a 3- to 5-fold increase in soil loss commonly occurs. The balance between the erosive power of the flow and the erosion resistance of the bed material determines the rate of concentrated flow erosion. The resistance of the bed material to detachment depends primarily on the magnitude of the interparticle forces or cohesion holding the particles and aggregates together. The effect of soil properties on bed material resistance and concentrated flow erosion was evaluated both in the laboratory and field. Both rill erodibility and critical hydraulic shear were greater when measured in 9.0 m long rills under field conditions compared with laboratory mini-flumes. A greater hydraulic shear was required to initiate erosion in the field compared to the mini-flume because of the greater aggregate and clod size and stability. Once erosion was initiated, however, the rate of erosion as a function of hydraulic shear was greater under field conditions because of the greater potential for slaking upon wetting and the greater soil surface area exposed to hydraulic shear. Erosion tests under controlled laboratory conditions with the mini-flume allowed individual soil variables to be studied. Attempts to relate rill erosion to a group soil properties had limited success. When individual soil properties were isolated and studied separately or grouped separately, some trends were identified. For example, the effect of organic carbon on rill erodibility was high in kaolinitic soils, low in smectitic soils, and intermediate in the soils dominated by illite. Slow prewetting and aging increased the cohesion forces between soil particles and decreased rill erodibility. Quick prewetting increased aggregate slaking and increased erodibility. The magnitude of the effect of aging depended upon soil type. The effect of clay mineralogy was evaluated on sand/clay mixtures with montmorillonite (M), Illite (I), and kaolinite (K) clays. Montmorillonite/sand mixtures were much less erodible than either illite or kaolonite sand mixtures. Na-I and Na-K sand mixtures were more erodible than Ca-I and Ca-K due to increased strength from ionic bonding and suppression of repulsive charges by Ca. Na-M was less erodiblethan Ca-M due to increased surface resulting from the accessibility of internal surfaces due to Na saturation. Erodibility decreased when salt concentration was high enough to cause flocculation. This occurred between 0.001 mole L-1 and 0.01 mole L-1. Measuring rill erodibility in mini-flumes enables the measurement of cohesive forces between particles and enhances our ability to learn more about cohesive forces resisting soil detachment under concentrated water flow.

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