scholarly journals Fossil Energy. Estimation of Particle Residence Time in Flow Model Furnace for Rotational Entrained-bed Coal Gasifier.

1994 ◽  
Vol 20 (6) ◽  
pp. 813-819 ◽  
Author(s):  
Atsushi Morihara ◽  
Syuntaro Koyama
Keyword(s):  
Residence Time ◽  
Flow Model ◽  
Energy Estimation ◽  
Fossil Energy ◽  
Particle Residence Time ◽  
Coal Gasifier

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

scholarly journals Modeling Residence Time Distribution (RTD) Behavior in a Packed-Bed Electrochemical Reactor (PBER)

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Sananth H. Menon ◽  
G. Madhu ◽  
Jojo Mathew
Keyword(s):  
Residence Time ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Flow Model ◽  
Plug Flow ◽  
Flow Characteristics ◽  
Theoretical Models ◽  
Packed Bed ◽  
Electrochemical Reactor ◽  
Tracer Studies

This paper focuses on understanding the electrolyte flow characteristics in a typical packed-bed electrochemical reactor using Residence Time Distribution (RTD) studies. RTD behavior was critically analyzed using tracer studies at various flow rates, initially under nonelectrolyzing conditions. Validation of these results using available theoretical models was carried out. Significant disparity in RTD curves under electrolyzing conditions was examined and details are recorded. Finally, a suitable mathematical model (Modified Dispersed Plug Flow Model (MDPFM)) was developed for validating these results under electrolyzing conditions.

scholarly journals Fossil Energy. Analysis of Reactions in the Grid Zone of a Continuous Jetting Fluidized Coal Gasifier.

1994 ◽  
Vol 20 (6) ◽  
pp. 805-812 ◽  
Author(s):  
Shigeyuki Uemiya ◽  
Hiroyuki Yoshitake ◽  
Jicheng Bi ◽  
Tadashi Kimura ◽  
Toshinori Kojima
Keyword(s):  
Energy Analysis ◽  
Fossil Energy ◽  
Coal Gasifier

scholarly journals Fossil Energy. Estimation of Length of Intercluster Bond in Coal by Density Simulation of Coal Molecular Model.

1994 ◽  
Vol 20 (6) ◽  
pp. 959-964 ◽  
Author(s):  
Toshimasa Takanohashi ◽  
Masashi Iino ◽  
Kazuo Nakamura
Keyword(s):  
Molecular Model ◽  
Energy Estimation ◽  
Fossil Energy

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.

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