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Showing 1 to 20 of 225 for “"shear stresses"”.
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Boundary shear stresses in curved trapezoidal channels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1961.
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Shear stresses in turbulent flow through concentric annuli
… approach to the direct measurement of wall shear stresses in fully developed turbulent flow in concentric annuli is presented. By means of a specially constructed 6 m test rig known as the 'floating sleeve', results of individual wall shear stresses, friction factors and shear stress …
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Flow characteristics and wall shear stresses in bifurcated peripheral arteries
… it affects the velocity, blood pressure, shear stresses and flow rates of blood. Femoral artery flow is modeled with blockage at different bifurcation angles (30°,45° and 60°) and it is analyzed at different conditions. A review of stents shows that there are several limitations associated …
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An in-shoe gait analysis device to measure the maximum shear stresses at the first metatarsal head
Recent research indicates that the shear stresses acting on a diabetic's foot are one of the major mechanical contributors to the high incidence of ulceration experienced by these patients. These stresses together with direct pressure are thought to have an effect on blood flow occlusion elsewhere …
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Measurements of surface shear stresses under a three-dimensional turbulent boundary layer using oil-film laser interferometry
Measurements of surface shear stress magnitude and direction are reported for a three-dimensional, pressure driven, turbulent boundary layer around a wing body junction. Measurements were made using a dual-beam oil film laser interferometer at 56 locations. An iterative procedure was developed …
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Establishing the Location and Magnitude of Critical Tensile Strains and Octahedral Shear Stresses for Design of Asphalt Concrete Pavement Systems
In recent years, our pavements experienced premature surface cracking and rutting. Traditional mechanistic design procedures account for two modes of failure in asphalt pavements: Fatigue and Rutting.
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The Rheology and Microstructure of Dense Bimodal Mixtures of Colloidal Particles With Long-Range, Soft Interactions
… to the monodisperse suspensions for most applied shear stresses. Yield stresses and the general flow curves for all mixtures studied followed the same scaling on the elastic modulus as the monodisperse suspensions. The mixtures display substantial differences in the shear thickening regime. …
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Non-perennial streamflow & geomorphic patterns in a semi-arid rangeland slated for development
… post-development distributed detention. Boundary shear stresses were used to compare the different simulations. Overall, the pre-development existing scenario had the lowest flows shear stresses for the two smallest storm scenarios (water quality capture volume and 2-year storms). For the 5-, 10-, …
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High Shear Flow Properties of Nanocellulose
… is known about the effects of high or extended shear stresses typical of those experienced during typical polymer processing. High shear rates, which proportionally result in high shear stresses, have the potential to influence the alignment, degradation, and overall usability of these materials …
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Assessment of Turbulence Modelling for Compressibility Effects in Ejector Ramjet Applications
… length, mixing layer growth rate, and Reynolds shear stresses. Compressibility corrections were applied to the turbulence model through closures for dilatation dissipation (DD), pressure dilatation (PD), and a combination of both effects (CD). All models improved agreement to experimental data, …
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Relaxation of Dense Suspension
… behavior by behaving liquid-like at low shear stresses and solid-like at high shear stresses. The microscopic interactions between individual particles create non-Newtonian macroscopic behaviors by transitioning from hydrodynamic interactions to frictional contacts. As the particles are …
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Effects of boundary roughness on turbulence in uniform open channel flow
… effects in the field. Effects on turbulence and shear stresses are of interest, since these forces greatly impact the process of sediment transport and mixing in open-channel flows. In this study, using highly controlled laboratory experiments, the effects of various bed configurations on …
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Implementation of Third Order Plate Theory for use in Existing Finite Element Software
… layers of material carrying predominantly shear loads. Finite elements developed for the analysis of sandwich plates need to accurately model transverse shear stresses through the plate thickness. This study was inspired by an Office of Naval Research project to investigate the suitability …
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Erythrocyte deformability as assessed by nuclepore filters
… physical model of the splenic microcirculation. Shear stresses of 15 dynes/cm or greater applied to erythrocytes for two minutes in a concentric cylinder viscometer result in red cell fragmentation and hemolysis. In this study the effects of lower shear stresses on cell deformability were …
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Seeding of Titanium Surfaces and Nitinol Stents with Blood-Derived Endothelial Cells
… on the Ti surface <italic>in vivo</italic>; (2) shear stresses on the surfaces of an implanted carotid artery stent will be conducive to EC retention and function under arterial flow; and (3) nitinol stents seeded with ECs at the point of care will remain adherent and functional after stent …
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A Study of Compressible Turbulent Free Shear Layers Using Laser Doppler Velocimetry (Supersonic Flow, Mixing, Recirculating)
… two-dimensional planar, turbulent free shear layers formed by the separation of a Mach 2.43 flow over a backward facing step was conducted. Two different wind tunnel test sections were used to achieve a constant pressure separation of the shear layer at the backstep corner so that the …
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Mikroelektrochemische Quantifizierung von Strömungsintensitäten zum Studium der Wirksamkeit von wandreibungsvermindernden Additiven
… and is generally characterized in terms of wall shear stresses as an integral parameter. By comparing the order of magnitude of wall shear stresses encoutered in real flow systems (1 to serveral hunderts Pa in extreme cases) with the fracture stress and adhesion forces of corrosion product layers …
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