Results 211 to 220 of about 64,050 (264)
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Wall Shear Stress and Early Atherosclerosis
American Journal of Roentgenology, 2000therosclerosis remains the leading cause of morbidity and mortality in the Western world [1, 2]. It is usually regarded as a systemic disease and several well-identified risk factors (i.e., hypertension, hyperlipidemia, diabetes mellitus, and cigarette smoking) have been implicated in its pathogenesis.
A M, Shaaban, A J, Duerinckx
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Measurement of Wall Shear Stress
2017A fluid flowing past a boundary exerts normal and tangential stresses on it. Normal stresses or pressures are readily measured by connecting a small hole on the surface to a manometer. Consequently, numerous studies have been made of the pressure distribution on solid surfaces in contact with a flowing fluid.
Thomas J. Hanratty, Jay A. Campbell
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On the measurement of wall shear stress
Experiments in Fluids, 1986The differential pressure reading from a static hole pair is utilized for determination of the local wall shear stress. Both the hole diameter and forward-facing angle are varied to test the sensitivity of the device. The static hole pair in tested in a two-dimensional zero pressure gradient turbulent boundary layer on a smooth surface. The calibrating
G. Onsrud, L. N. Persen, L. R. Saetran
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Wall shear stress in stenotic artery
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1992The effects induced by a mild arterial stenosis on the wall shear stress is theoretically investigated. Distribution of shear stress along canine femoral artery and during the cardiac cycle is calculated simulating both the physiological state of the artery and the stenotic condition.
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Unsteady wall shear stress in a distensible tube
Journal of Biomechanics, 1991An asymptotic expression of the wall shear stress (WSS) in an elastic tube is deduced for small values of the Womersley parameter. In the case of a rigid tube this asymptotic expression is shown to compare better with the exact solution than Poiseuille's or Lambossy's approximations.
M, Zagzoule, J, Khalid-Naciri, J, Mauss
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ASME 2009 Summer Bioengineering Conference, Parts A and B, 2009
While the pathogenesis of an intracranial aneurysm (IA) is poorly understood, it has been generally postulated to be related to hemodynamic insult. IAs are predominantly located at apices of arterial bifurcations or outer curves on or near the Circle of Willis, suggesting a potential role of the specific hemodynamics at such locations characterized by ...
Eleni Metaxa +7 more
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While the pathogenesis of an intracranial aneurysm (IA) is poorly understood, it has been generally postulated to be related to hemodynamic insult. IAs are predominantly located at apices of arterial bifurcations or outer curves on or near the Circle of Willis, suggesting a potential role of the specific hemodynamics at such locations characterized by ...
Eleni Metaxa +7 more
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An instrument for wall shear stress measurement
Ninth International Symposium on Precision Mechanical Measurements, 2019The instrument is designed for wall shear stress measurement, operating with flexible hot film sensors or floating-element sensors. The hot film sensor can be used to measure the wall shear stress on curved surfaces. And the floating-element sensor directly senses wall shear stress, and the output signal has good linear characteristics. The application
Yuchao Yan +7 more
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Preliminary measurements of wall shear stress
International Communications in Heat and Mass Transfer, 1999Abstract This paper presents the investigation of wall shear stress of the fluid flow in the clearance gap between the impeller face and inlet casing of a blood pump model. This was accomplished through hot-wire anemometry and rotating disk apparatus.
L.P. Chua, S.C. Tung, W.K. Chan
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The Measurement of Wall Shear Stress
1989Knowledge of the wall shear stress is of both fundamental and practical importance. The mean stress is indicative of the overall state of the flow over a given surface while the fluctuating stress is a “footprint” of the individual processes that transfer momentum to the wall.
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[Wall shear stress and endothelium].
Casopis lekaru ceskych, 2005Blood flow influences the luminal side of vessel wall by a frictional force known as wall shear stress (WSS). This local hemodynamic factor is an important determinant of endothelial gene expression and of endothelial phenotype. The effect of WSS depends on its magnitude and direction, as well as on the characteristic of vessel geometry and blood flow.
J, Rotreklová +3 more
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