Numerical study of particle transport by an alternating travelling-wave electrostatic field

2021 ◽  
Author(s):  
Junping Gu ◽  
Qinggong Wang ◽  
Yuxin Wu ◽  
Lele Feng ◽  
Guang Zhang ◽  
...  
Keyword(s):  
Electrostatic Field ◽  
Particle Transport ◽  
Numerical Study ◽  
Travelling Wave

Tracer trajectories and displacement due to a micro-swimmer near a surface

2015 ◽  
Vol 773 ◽  
pp. 498-519 ◽  
Author(s):  
A. J. T. M. Mathijssen ◽  
D. O. Pushkin ◽  
J. M. Yeomans
Keyword(s):  
Particle Transport ◽  
Numerical Study ◽  
Tracer Particle ◽  
Persistence Length ◽  
Theoretical Work ◽  
Solid Boundary ◽  
Tracer Transport ◽  
Tracer Particles ◽  
Recent Theoretical Work ◽  
Run And Tumble

We study tracer particle transport due to flows created by a self-propelled micro-swimmer, such as a swimming bacterium, alga or a microscopic artificial swimmer. Recent theoretical work has shown that as a swimmer moves in the fluid bulk along an infinite straight path, tracer particles far from its path perform closed loops, whereas those close to the swimmer are entrained by its motion. However, in biologically and technologically important cases tracer transport is significantly altered for swimmers that move in a run-and-tumble fashion with a finite persistence length, and/or in the presence of a free surface or a solid boundary. Here we present a systematic analytical and numerical study exploring the resultant regimes and their crossovers. Our focus is on describing qualitative features of the tracer particle transport and developing quantitative tools for its analysis. Our work is a step towards understanding the ecological effects of flows created by swimming organisms, such as enhanced fluid mixing and biofilm formation.

Numerical study of the auroral particle transport in the polar upper atmosphere

2008 ◽  
Vol 51 (10) ◽  
pp. 1759-1771 ◽  
Author(s):  
HongTao Cai ◽  
ShuYing Ma ◽  
ZuYin Pu
Keyword(s):  
Particle Transport ◽  
Numerical Study ◽  
Upper Atmosphere

scholarly journals Numerical Study of Electrostatic Field Distortion on LPTPC End-Plates based on Bulk Micromegas Modules

2018 ◽  
Vol 174 ◽  
pp. 06007
Author(s):  
Purba Bhattacharya ◽  
Deb Sankar Bhattacharya ◽  
Supratik Mukhopadhyay ◽  
Nayana Majumdar ◽  
Sudeb Bhattacharya ◽  
...  
Keyword(s):  
Electrostatic Field ◽  
Linear Collider ◽  
Numerical Study ◽  
Superconducting Magnet ◽  
Simulation Framework ◽  
Test Beam ◽  
Field Distortion ◽  
Signal Sensitivity ◽  
Micro Pattern ◽  
First Time

The R&D activities for the linear collider TPC (LC-TPC) are currently working on the adoption of the micro pattern devices for the gaseous amplification stage. Several beam tests have been carried out at DESY with a 5 GeV electron beam in a 1 T superconducting magnet. We worked on a large prototype TPC with an end-plate that was built, for the first time, using seven resistive bulk Micromegas modules. During experiments, reduced signal sensitivity was observed at the boundary of these modules. Electrostatic field distortion near the module boundaries was considered to be the possible major reason behind these observations. In the present work, we will explore this hypothesis through numerical simulation. Our aim has been to understand the origin of distortions observed close to the edges of the test beam modules and to explore the possibility of using the Garfield simulation framework for investigating a phenomenon as complex as distortion.

Transition in Homogeneously Heated Inclined Plane Parallel Shear Flows

2003 ◽  
Vol 125 (5) ◽  
pp. 795-803 ◽  
Author(s):  
S. Generalis ◽  
M. Nagata
Keyword(s):  
Shear Flows ◽  
Numerical Study ◽  
Fluid Layer ◽  
Travelling Wave ◽  
Inclined Plane ◽  
Vertical Orientation ◽  
Plane Parallel ◽  
Wide Range ◽  
Parallel Shear Flows ◽  
Roll Type

The transition of internally heated inclined plane parallel shear flows is examined numerically for the case of finite values of the Prandtl number Pr. We show that as the strength of the homogeneously distributed heat source is increased the basic flow loses stability to two-dimensional perturbations of the transverse roll type in a Hopf bifurcation for the vertical orientation of the fluid layer, whereas perturbations of the longitudinal roll type are most dangerous for a wide range of the value of the angle of inclination. In the case of the horizontal inclination transverse roll and longitudinal roll perturbations share the responsibility for the prime instability. Following the linear stability analysis for the general inclination of the fluid layer our attention is focused on a numerical study of the finite amplitude secondary travelling-wave solutions (TW) that develop from the perturbations of the transverse roll type for the vertical inclination of the fluid layer. The stability of the secondary TW against three-dimensional perturbations is also examined and our study shows that for Pr=0.71 the secondary instability sets in as a quasi-periodic mode, while for Pr=7 it is phase-locked to the secondary TW. The present study complements and extends the recent study by Nagata and Generalis (2002) in the case of vertical inclination for Pr=0.

Numerical Study of Airborne Particle Transport in an Operating Room

2003 ◽  
Vol 2 (2) ◽  
pp. 103-110 ◽  
Author(s):  
Yunlong Liu ◽  
Alfred Moser ◽  
Kazuyoshi Harimoto
Keyword(s):  
Operating Room ◽  
Particle Transport ◽  
Numerical Study ◽  
Airborne Particle

Experimental Study of Surrogate Particle Transport and Deposition in a Square Channel Using Particle Tracking Technique

2019 ◽  
Author(s):  
Daniel Orea ◽  
Thien Nguyen ◽  
Rodolfo Vaghetto ◽  
N. K. Anand ◽  
Yassin A. Hassan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Particle Tracking ◽  
Particle Transport ◽  
Particle Deposition ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Test Facility ◽  
Square Channel ◽  
Fluid Flow Characteristics

Abstract This paper presents an experimental study of hydrodynamics flow characteristics and particle transport in a test facility. Experimental measurements of fluid flow and particle deposition are studied under isothermal conditions using particle image velocimetry (PIV) and particle tracking velocimetry (PTV) techniques. These non-intrusive optical measurement techniques have been applied in experiment conditions of Reynolds number Re = 5,077 in a 3-inch square channel and 72-inches in total length. The fluid within the channel is air seeded with aerosol droplets while the measurements of particle transport is facilitated using surrogate particles dispersed in the channel flow. Results obtained from the PIV and PTV measurements included the hydrodynamics fluid flow characteristics, and characteristics of particle transports, such as particle velocity, particle diameter distributions and particle concentration profiles. Results from the preliminary test have shown 11.08% deposition of particles. To supplement this experimental work, upstream fluid flow characteristics were provided as boundary conditions for a comparable numerical study.

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