Measurement of fluid velocity fields using digital correlation techniques

1991 ◽  
Author(s):  
Donald R. Matthys ◽  
John A. Gilbert ◽  
Joseph T. Puliparambil
Keyword(s):  
Fluid Velocity ◽  
Velocity Fields ◽  
Digital Correlation ◽  
Correlation Techniques

Flow Field Analysis of Dielectrophoretically-Suspended Particles

2007 ◽  
Author(s):  
Stuart J. Williams ◽  
Steven T. Wereley
Keyword(s):  
Electric Fields ◽  
Particle Image ◽  
Fluid Velocity ◽  
Microfluidic Channel ◽  
Velocity Fields ◽  
Field Analysis ◽  
Tracer Particles ◽  
Image Velocimetry ◽  
Flow Field Analysis ◽  
Complete Investigation

Understanding the fluid dynamics around a particle in suspension is important for a complete investigation of many hydrodynamic phenomena, including microfluidic models. A novel tool that has been used to analyze fluid velocity fields in microfluidics is micro-resolution particle image velocimetry (μPIV) [1]. Dielectrophoresis (DEP) is a technique that can translate and trap particles by induced polarization in the presence of nonuniform electric fields. In this paper, DEP has been used to capture and suspend a single 10.1μm diameter spherical particle in a microfluidic channel. μPIV is then used with smaller tracer particles (0.5μm) to investigate the hydrodynamics of fluid flow past the trapped particle.

Recording Fluid Velocity Fields Holographically

1968 ◽  
Author(s):  
Reinhard Menzel ◽  
Thomas G. Russell ◽  
F. M. Shofner
Keyword(s):  
Fluid Velocity ◽  
Velocity Fields

Digital-correlation techniques in radio science

Radio Science ◽  
1973 ◽  
Vol 8 (8-9) ◽  
pp. 775-784 ◽  
Author(s):  
J. B. Hagen ◽  
D. T. Farley
Keyword(s):  
Radio Science ◽  
Digital Correlation ◽  
Correlation Techniques

Extension of a Method of Solution for Poisson’s Equation

1963 ◽  
Vol 30 (3) ◽  
pp. 415-418 ◽  
Author(s):  
M. H. Cobble ◽  
W. F. Ames
Keyword(s):  
Functional Form ◽  
Fluid Velocity ◽  
Velocity Fields ◽  
Poisson’S Equation ◽  
Coordinate Transformations ◽  
Poisson's Equation ◽  
Method Of Solution ◽  
Substitution Procedure

A classical substitution procedure for solving Poisson’s equation ∇2φ = −K is extended by application of certain coordinate transformations suggested by the functional form of K. The method is applied to the determination of fluid-velocity fields in two curvilinear geometries.

Noncoherent-Light Speckle Photography For Measurements Of Fluid Velocity Fields

1980 ◽  
Author(s):  
Gary Cloud ◽  
Robert Falco ◽  
Russell Radke ◽  
Jeffery Peiffer
Keyword(s):  
Fluid Velocity ◽  
Velocity Fields ◽  
Speckle Photography ◽  
Noncoherent Light

PIV Analysis of Instantaneous Flow Structures in an Inkjet Printhead

1999 ◽  
Author(s):  
Hongsheng Zhang ◽  
Carl D. Meinhart
Keyword(s):  
Particle Image ◽  
Fluid Velocity ◽  
Ccd Camera ◽  
Velocity Fields ◽  
Flow Structures ◽  
Instantaneous Flow ◽  
Piv Technique ◽  
Image Velocimetry ◽  
Piv Analysis ◽  
Inkjet Printhead

Abstract This paper presents experimental measurements and observations of instantaneous flow structures inside an inkjet printhead, using a micron-resolution Particle Image Velocimetry (PIV) system to record visualized flows and calculate velocity fields. The PIV technique uses 700 nm diameter fluorescent flow-tracing particles, a pulsed Nd:YAG laser, an epi-fluorescent microscope and an interline-transfer CCD camera to record images of a flow at two successive instances in time. By measuring how far a set of particles move during a specified duration of time, an estimate of the local fluid velocity can be obtained. An electronic timing strategy has been developed to synchronize the PIV lasers, the CCD camera and the drop ejection system. An overall flow pattern during a 500 μs ejection cycle has been observed by phase-averaging hundreds of instantaneous velocity fields, which were recorded at 2–5 μs intervals throughout the cycle. A velocity field with spatial resolution of approximately 10 μm was obtained near the inkjet nozzle. Meniscus and nodes inside the printhead were also observed and recorded.

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