نتایج جستجو برای: wall shear stress

تعداد نتایج: 647164  

Journal: :The Journal of experimental biology 2004
Michael I Latz Andrew R Juhl Abdel M Ahmed Said E Elghobashi Jim Rohr

Dinoflagellate bioluminescence provides a near-instantaneous reporter of cell response to flow. Although both fluid shear stress and acceleration are thought to be stimulatory, previous studies have used flow fields dominated by shear. In the present study, computational and experimental approaches were used to assess the relative contributions to bioluminescence stimulation of shear stress and...

Journal: :Computers in biology and medicine 2013
Fang-Bao Tian Luoding Zhu Pak-Wing Fok Xi-Yun Lu

Atherosclerotic plaque can cause severe stenosis in the artery lumen. Blood flow through a substantially narrowed artery may have different flow characteristics and produce different forces acting on the plaque surface and artery wall. The disturbed flow and force fields in the lumen may have serious implications on vascular endothelial cells, smooth muscle cells, and circulating blood cells. I...

2011
U K Ayaz

We report an optical wall shear stress sensor based on the whispering gallery mode (WGM) shifts of dielectric micro-resonators. The optical resonators are spheres with a typical diameter of several hundred microns and they serve as the sensing element. The wall shear force acting on a movable plate is transmitted mechanically to the microsphere. As a result of the applied force, the shape of th...

2010
Sapna Singh Rajeev Ratan Shah

The objective of this present numerical model is to investigate the effect of shape of stenosis on blood flow through an artery using power-law fluid model. Blood is modeled as power-law fluid in a uniform circular tube with an axially non-symmetric but radially symmetric stenosis. The expressions for dimensionless resistance to flow, wall shear stress and apparent viscosity have been obtained....

Journal: :Arteriosclerosis, thrombosis, and vascular biology 2014
Ryan M Pedrigi Ranil de Silva Sandra M Bovens Vikram V Mehta Enrico Petretto Rob Krams

In this review, we summarized the effect of mechanical factors (shear and wall stress) on thin-cap fibroatheroma formation and rupture. To make this review understandable for a biology-oriented audience, we start with detailed definitions of relevant mechanical metrics. We then describe how biomechanics has supported histopathologic efforts to understand the basis of plaque rupture. In addition...

2015
Frank C. G. van Bussel Bas C. T. van Bussel Arnold P. G. Hoeks Jos Op 't Roodt Ronald M. A. Henry Isabel Ferreira Floris H. M. Vanmolkot Casper G. Schalkwijk Coen D. A. Stehouwer Koen D. Reesink

Flow-mediated dilation is aimed at normalization of local wall shear stress under varying blood flow conditions. Blood flow velocity and vessel diameter are continuous and opposing influences that modulate wall shear stress. We derived an index FMDv to quantify wall shear stress normalization performance by flow-mediated dilation in the brachial artery. In 22 fasting presumed healthy men, we fi...

In this paper a method is presented for torsional analysis of non-homogeneous tubes with arbitrarily shaped cross-sections. A previously presented method based on Bredt’s theory is extended to achieve formulas for torsional analysis. Shear modulus varies through the thickness according to a power law distribution. To validate the accuracy of the presented formulas for angle of twist and shear s...

2010
Azuraien Jaafar Marcel P. Escudier Robert J. Poole

In this study the pressure-drop, mean and rms axial velocity data are measured using a differential pressure transducer and a laser Doppler anemometer for the flow of Newtonian and non-Newtonian fluids in a concentric annular pipe (radius ratio =0.5) at various Reynolds numbers encompassing the laminar, transitional and turbulent regimes. Three different fluids are utilized; a semi-rigid shear-...

In this paper, the nonlinear behavior of R.C frames strengthened by shear walls and steel bracings is investigated. The use of steel bracing and R.C shear wall for strengthening of existing R.C structures usually leads to very complicated system and the study of the behavior of this kind of structures especially their connections, steel bracing area, and frame - shear walls and bracing interact...

2016
Wen-Xue Yuan Hai-Bin Liu Feng-Shan Gao Yan-Xia Wang Kai-Rong Qin

BACKGROUND Exercise has been found to either reduce or increase arterial stiffness. Land-based exercise modalities have been documented as effective physical therapies to decrease arterial stiffness. However, these land-based exercise modalities may not be suitable for overweight individuals, in terms of risks of joint injury. The purpose of this study was to determine the effects of 8-week swi...

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