scholarly journals Impact of Intracranial Aneurysm Morphology and Rupture Status on the Particle Residence Time

2019 ◽  
Vol 29 (4) ◽  
pp. 487-492
Author(s):  
E.L. Leemans ◽  
B.M.W. Cornelissen ◽  
G. Rosalini ◽  
D. Verbaan ◽  
J.J. Schneiders ◽  
...  
Keyword(s):  
Intracranial Aneurysm ◽  
Residence Time ◽  
Particle Residence Time ◽  
Aneurysm Morphology

Effect of Particle Residence Time on Particle Dispersion in a Plane Mixing Layer

1993 ◽  
Vol 115 (4) ◽  
pp. 751-759 ◽  
Author(s):  
Tsuneaki Ishima ◽  
Koichi Hishida ◽  
Masanobu Maeda
Keyword(s):  
Gas Phase ◽  
Residence Time ◽  
Time Scale ◽  
Characteristic Time ◽  
Mixing Layer ◽  
Particle Dispersion ◽  
Laser Doppler Velocimeter ◽  
Characteristic Time Scale ◽  
Two Phase ◽  
Particle Residence Time

A particle dispersion has been experimentally investigated in a two-dimensional mixing layer with a large relative velocity between particle and gas-phase in order to clarify the effect of particle residence time on particle dispersion. Spherical glass particles 42, 72, and 135 μm in diameter were loaded directly into the origin of the shear layer. Particle number density and the velocities of both particle and gas phase were measured by a laser Doppler velocimeter with modified signal processing for two-phase flow. The results confirmed that the characteristic time scale of the coherent eddy apparently became equivalent to a shorter characteristic time scale due to a less residence time. The particle dispersion coefficients were well correlated to the extended Stokes number defined as the ratio of the particle relaxation time to the substantial eddy characteristic time scale which was evaluated by taking account of the particle residence time.

Particle residence time distributions in a vortex-based solar particle receiver-reactor: The influence of receiver tilt angle

Solar Energy ◽  
2019 ◽  
Vol 190 ◽  
pp. 126-138 ◽  
Author(s):  
Dominic Davis ◽  
Maurizio Troiano ◽  
Alfonso Chinnici ◽  
Woei L. Saw ◽  
Timothy Lau ◽  
...  
Keyword(s):  
Residence Time ◽  
Tilt Angle ◽  
Solar Particle ◽  
Particle Residence Time ◽  
Residence Time Distributions

Intracranial Aneurysm Morphology and Flow Dynamics to Assess Rupture Risk

2009 ◽  
Author(s):  
Jianping Xiang ◽  
Markus Tremmel ◽  
Ding Ma ◽  
J. Mocco ◽  
Adnan Siddiqui ◽  
...  
Keyword(s):  
Intracranial Aneurysm ◽  
Flow Dynamics ◽  
Rupture Risk ◽  
Parent Vessel ◽  
Aneurysm Morphology

The effectiveness of Intracranial Aneurysm (IA) size as a predictor for rupture has been debated. The confusing trends observed *unicefwhile stratifying IA rupture risk according to IA size may have arisen from overlooking its morphology and size relative to its parent vessel.

Modeling the Geometry, Hemodynamics and Tissue Mechanics of Cerebral Aneurysms

2004 ◽  
Author(s):  
Baoshun Ma ◽  
Robert Harbaugh ◽  
Jia Lu ◽  
Madhavan Raghavan
Keyword(s):  
Shear Stress ◽  
Mechanical Stress ◽  
Cerebral Aneurysm ◽  
Residence Time ◽  
Cerebral Aneurysms ◽  
Lesion Size ◽  
Tissue Mechanics ◽  
Particle Residence Time ◽  
Aneurysm Wall ◽  
Geometric Size

The relationship between cerebral aneurysm geometry and biomechanics was investigated. Human cerebral aneurysm geometry was reconstructed from computed tomography angiography (CTA) and refined. Various indices of global geometric (size and shape) features were computed based on differential and computational geometry techniques. Computational fluid dynamics (CFD) simulations were performed to model both steady and pulsatile blood flow in the aneurysm and surrounding vasculature. Hemodynamic indices such as wall shear stress, pressure and particle residence time were obtained. Nonlinear finite element method (FEM) and a reported finite strain constitutive model were employed to estimate the distribution of mechanical stress in the aneurysm wall under static pressure. Shear stress, sac pressure and mechanical stress correlated better with lesion shape while particle residence time correlated better with lesion size.

scholarly journals Investigation of Hydrodynamic Behavior of Alginate Aerogel Particles in a Laboratory Scale Wurster Fluidized Bed

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2915
Author(s):  
Işık Sena Akgün ◽  
Can Erkey
Keyword(s):  
Fluidized Bed ◽  
Residence Time ◽  
Laboratory Scale ◽  
Tube Length ◽  
Operating Parameters ◽  
Hydrodynamic Behavior ◽  
Particle Residence Time ◽  
Upper Limit ◽  
Gap Height ◽  
Circulatory Motion

The effects of design and operating parameters on the superficial velocity at the onset of circulatory motion and the residence time of alginate aerogel particles in a laboratory scale Wurster fluidized bed were investigated. Several sets of experiments were conducted by varying Wurster tube diameter, Wurster tube length, batch volume and partition gap height. The superficial velocities for Wurster tube with 10 cm diameter were lower than the tube with 8 cm diameter. Superficial velocities increased with increasing batch volume and partition gap height. Moreover, increasing batch volume and partition gap height led to a decrease in the particle residence time in the Wurster tube. The results showed that there is an upper limit for each parameter in order to obtain a circulatory motion of the particles. It was found that the partition gap height should be 2 cm for proper particle circulation. Maximum batch volume for the tube with 10 cm diameter was found as 500 mL whereas maximum batch volume was 250 mL for the tube with 8 cm diameter. The fluidization behavior of the aerogel particles investigated in this study could be described by the general fluidization diagrams in the literature.

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