نتایج جستجو برای: oscillatory flow

تعداد نتایج: 499500  

2003
Jae Hyun Park Ali Beskok

A complete mathematical description of oscillatory Couette flows within the framework of kinetic theory is not available in the literature. Motivated by this and their vast engineering applications, we present a parametric study of time-periodic oscillatory Couette flows using the unsteady direct simulation Monte Carlo ~DSMC! method. Computations are performed as a function of the Knudsen ~Kn! ...

2003
Michael Ghil Andrew W. Robertson

We examine in this paper the role that oscillatory interactions between the jet stream and Northern Hemisphere (NH) mountain ranges play in the low-frequency variability (LFV) of the mid-latitude atmosphere. The basic observational evidence for intraseasonal oscillations in the NH extratropics is reviewed, along with the results of a hierarchy of models—from the simplest to full GCMs—that expla...

A severe case of stenosis in coronary arteries results in turbulence in the blood flow which may lead to the formation or progression of atherosclerosis. This study investigated the turbulent blood flow in a coronary artery with rigid walls, as well as 80% single and double stenoses on blood flow. A finite element-based software package, ADINA 8.8, was employed to model the blood flow. The hemo...

Journal: :J. Sci. Comput. 2014
Debojyoti Ghosh James D. Baeder

A new class of compact-reconstruction weighted essentially non-oscillatory (CRWENO) schemes were introduced (Ghosh and Baeder in SIAM J Sci Comput 34(3): A1678–A1706, 2012) with high spectral resolution and essentially non-oscillatory behavior across discontinuities. The CRWENO schemes use solution-dependent weights to combine lower-order compact interpolation schemes and yield a high-order com...

Journal: :American journal of physiology. Heart and circulatory physiology 2006
Veronica Gambillara Céline Chambaz Gabriela Montorzi Sylvain Roy Nikos Stergiopulos Paolo Silacci

Hemodynamic forces play an active role in vascular pathologies, particularly in relation to the localization of atherosclerotic lesions. It has been established that low shear stress combined with cyclic reversal of flow direction (oscillatory shear stress) affects the endothelial cells and may lead to an initiation of plaque development. The aim of the study was to analyze the effect of hemody...

2011
Yi Fu Yingjian Hou Chenglai Fu Mingxia Gu Chenghong Li Wei Kong Xian Wang John Y.-J. Shyy Yi Zhu

Rationale: Endothelial cells (ECs) have distinct mechanotransduction mechanisms responding to laminar versus disturbed flow patterns. Endothelial dysfunction, affected by imposed flow, is one of the earliest events leading to atherogenesis. The involvement of / T lymphocytes in endothelial dysfunction under flow is largely unknown. Objective: To investigate whether shear stress regulates membra...

2014
Pinar Akcora

Mechanical properties of polymer nanocomposites are significantly affected by spatial ordering of nanoparticles (NPs) which can be modified under shear flow fields. Polymer-grafted iron oxide NPs form strings, well-dispersed, and percolated anisotropic nanostructures depending on grafting density, and herein their mechanical properties under large oscillatory shear flows are reported. We show t...

Journal: :Biorheology 2006
Jiannong Fang Robert G Owens

In the present paper we use a new constitutive equation for whole human blood [R.G. Owens, A new microstructure-based constitutive model for human blood, J. Non-Newtonian Fluid Mech. (2006), to appear] to investigate the steady, oscillatory and pulsatile flow of blood in a straight, rigid walled tube at modest Womersley numbers. Comparisons are made with the experimental results of Thurston [El...

Journal: :Biomacromolecules 2012
Simon J Haward Vivek Sharma Craig P Butts Gareth H McKinley Sameer S Rahatekar

In this study, we characterize the shear and extensional rheology of dilute to semidilute solutions of cellulose in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIAc). In steady shear flow, the semidilute solutions exhibit shear thinning, and the high-frequency complex modulus measured in small amplitude oscillatory shear flow exhibits the characteristic scaling expected for solutions...

Journal: :Physical review letters 2007
N Willenbacher C Oelschlaeger M Schopferer P Fischer F Cardinaux F Scheffold

We characterize the linear viscoelastic shear properties of an aqueous wormlike micellar solution using diffusing wave spectroscopy (DWS) based tracer microrheology as well as various mechanical techniques such as rotational rheometry, oscillatory squeeze flow, and torsional resonance oscillation covering the frequency range from 10(-1) to 10(6) rad/s. Since DWS as well as mechanical oscillator...

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