Flow visualization and quantitative measurements inside porous media by particle image velocimetry

2003 ◽  
Author(s):  
Dian-Chang Wang ◽  
Arzhang Khalili
Keyword(s):  
Porous Media ◽  
Particle Image Velocimetry ◽  
Flow Visualization ◽  
Particle Image ◽  
Quantitative Measurements ◽  
Image Velocimetry

Experimental Study of the Flow Structure in Fire-Induced Whirlwinds Downwind of a Fire Using Particle Image Velocimetry

2007 ◽  
Author(s):  
Masahiko Shinohara ◽  
Sanae Matsushima
Keyword(s):  
Experimental Study ◽  
Particle Image Velocimetry ◽  
Flow Visualization ◽  
Flow Structure ◽  
Particle Image ◽  
Reverse Flow ◽  
Tangential Velocity ◽  
Visualization Technique ◽  
Image Velocimetry ◽  
In Fire

The flow structure of fire-induced whirlwinds that occur downwind of a 90-cm-diameter methanol flame was investigated using particle image velocimetry (PIV) and a flow visualization technique. The PIV images showed that the whirlwinds occurred as counter-rotating vortices on both sides of a reverse flow downwind of the flame that moved toward it near the floor. The whirlwinds started near the floor and extended upwards, with a lower tangential velocity near the floor. The radius of the forced vortex region in the whirlwinds increased above a height of 11 cm. Whirlwinds downwind of the 90-cm-diameter methanol flame behaved the same as whirlwinds downwind of a 3-cm-diameter flame that were investigated in a previous study.

Research Methodology of Cross-Flow Cylinder Pipe Hydrodynamical

2013 ◽  
Vol 8 (4) ◽  
pp. 110-117
Author(s):  
Konstantin Dobroselsky
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Visualization ◽  
Turbulent Flows ◽  
Research Methodology ◽  
Particle Image ◽  
Cross Flow ◽  
Velocity Fields ◽  
Experimental Setup ◽  
Flow Around A Cylinder ◽  
Image Velocimetry

Experimental setup (hydrodynamic pipe) for the study of turbulent flows has been upgraded. Test experiments with a cross-flow around a cylinder have been carried out. Using the method of flow visualization PIV (Particle Image Velocimetry) the velocity fields around the cylinder for precavitational and cavitation regimes (Re = 2,8 · 105 ) have been obtained

Start-up Flow Visualization of Viscoplastic Fluid in Horizontal Pipes Geometries Using Particle Image Velocimetry

2020 ◽  
Author(s):  
Angel De Jesus Rivera Jimenez ◽  
Vitor Yoshiharu Urazaki ◽  
Yamid José García Blanco ◽  
Eduardo Matos Germer ◽  
Admilson Franco
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Visualization ◽  
Particle Image ◽  
Viscoplastic Fluid ◽  
Horizontal Pipes ◽  
Start Up ◽  
Image Velocimetry

Experimental Characterization of Micro Mixers Using Microscale-Laser Induced Fluorescence and Particle Image Velocimetry

2006 ◽  
Author(s):  
Marko Hoffmann ◽  
Michael Schlu¨ter ◽  
Norbert Ra¨biger
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Visualization ◽  
Particle Image ◽  
Measurement Techniques ◽  
Laser Induced Fluorescence ◽  
Transport Processes ◽  
Full Potential ◽  
Micro Particle Image Velocimetry ◽  
Image Velocimetry ◽  
Micro Mixer

Microreactors are basic components of microfluidic systems for chemical and biochemical applications and the large area-to-volume ratio of micro-reactors enables a higher yield and selectivity than conventionally designed processes. To take advantage of the full potential of this ambitious technology, a fundamental understanding of the transport processes on the relevant time and length scales is necessary. Besides the approach of using commercial CFD programs for numerical flow visualization, the microscale fluid flow visualization is an important tool for acquiring localized flow information within these microreactors. To get a deeper insight the mixing characteristic of different T-shaped micro mixers with rectangular cross sections (dimensions: 100–400 micron) has been investigated by means of the non-invasive measurement techniques micro-Laser induced fluorescence (micro-LIF) and micro-Particle Image Velocimetry (micro-PIV). The analysis of the concentration fields proves that with a higher Re a stretching and thinning of liquid lamellae (vortex generation) occurs, causing an enlarged interfacial surface area and consequently leading to a better mixing performance by diffusion. The analysis of the velocity fields shows further the existence of a three dimensional flow in the entrance region of the mixing channel of a T-shaped micro mixer.

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