Time-resolved scanning stereo PIV measurement of three-dimensional velocity field of highly buoyant jet

2012 ◽  
Vol 15 (3) ◽  
pp. 231-240 ◽  
Author(s):  
T. Gono ◽  
T. Syuto ◽  
T. Yamagata ◽  
N. Fujisawa
Keyword(s):  
Velocity Field ◽  
Three Dimensional ◽  
Buoyant Jet ◽  
Time Resolved ◽  
Piv Measurement

Research on the Three-Dimensional Velocity Field Splitting Measurement Method of Cavitations-Impinging Stream Reactor

2012 ◽  
Vol 571 ◽  
pp. 618-621
Author(s):  
Qin Li ◽  
Fu Bao Li ◽  
Zhong Ke Li ◽  
De Xi Wang
Keyword(s):  
Velocity Field ◽  
Dimensional Space ◽  
Splitting Method ◽  
Three Dimensional ◽  
Ccd Camera ◽  
Light Emitting ◽  
Basic Measurement ◽  
Piv Measurement ◽  
Image Velocimetry ◽  
Three Dimensional Space

In the Particle image velocimetry (PIV) measurement system, using the basic measurement principles of three-dimensional space position and splitting method, it, using a CCD camera, achieved the measurement to a space position. Light emitting diodes flash twice and image in the same CCD camera and space vector can be obtained directly by the image processing, and then three-dimensional velocity field can be obtained.

High Speed Micro Holographic PIV Measurements of Microorganisms

2008 ◽  
Author(s):  
M. Zarzecki ◽  
F. J. Diez
Keyword(s):  
Velocity Field ◽  
High Speed ◽  
Fourier Transforms ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Imaging Method ◽  
Time Resolved ◽  
Feeding Methods ◽  
Holographic Particle Image Velocimetry ◽  
Three Components

Holographic particle image velocimetry (PIV) is a novel application of holography that allows for tracking of small particle sized objects in a small volume. Whereas regular PIV allows for the two in-plane components of the velocity field to be measured, and stereoscopic PIV allows for the three-components of the velocity field to be measured in a thin plane, holographic PIV allows for the three-components of the velocity to be measured for each individual particle present in the measuring volume, thus allowing to fully resolve fluid flows that are inherently 3D in nature. There are many examples of three dimensional flows in nature including turbulence flows, but another very interesting application very well suited for this technique involves tracking living microorganisms in order to study their motion and their means of propulsion. As part of this research a micro organism was tracked in three dimensions using a high speed microscopic holographic imaging method. The ability to track organisms in 3D allows better understanding and characterizing of their behavior including their propulsion methods, their feeding methods and their interaction with each other. The time resolved holograms were reconstructed in Matlab using Fast Fourier Transforms. A laser pointer was used as a source of coherent light, and a high speed PIV camera (Photron APX Ultima) was used to capture the images. A beam expander was used to increase the diameter of the laser beam allowing for a larger tracking area. Results with this system will show the trajectories in 3D of microorganisms as well as the three components of the velocity field showing the interaction of the organisms with their environment.

Simultaneous three-dimensional temperature and velocity field measurements using astigmatic imaging of non-encapsulated thermo-liquid crystal (TLC) particles

Lab on a Chip ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 660-663 ◽  
Author(s):  
Rodrigo Segura ◽  
Massimiliano Rossi ◽  
Christian Cierpka ◽  
Christian J. Kähler
Keyword(s):  
Liquid Crystal ◽  
Velocity Field ◽  
Three Dimensional ◽  
Field Measurements ◽  
Velocity Measurements ◽  
Time Resolved

TLC thermography and APTV for simultaneous time-resolved 3D temperature and velocity measurements in microflows.

scholarly journals Reynolds stress tensor and pressure-related turbulence transport terms measured by time-resolved tomographic-PIV

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Jose Roberto Moreto ◽  
Xiaofeng Liu
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
Turbulent Flows ◽  
High Speed ◽  
Three Dimensional ◽  
Time Resolved ◽  
Tomographic Piv ◽  
Piv Measurement ◽  
Derivatives Of

Turbulence is inherently a three-dimensional and time dependent flow phenomenon (Pope, 2001). Because of the ubiquitous existence of turbulent flows in nature, accurate characterization of turbulent flows, either through experimental measurements or through direct numerical simulations, is of paramount importance for modeling turbulence (Liu and Katz, 2018). Since its inception in 1984 (Adrian, 1984), Particle Image Velocimetry (PIV), among several other conventional techniques used for turbulence measurements, has been a valuable tool for providing reliable experimental data for turbulence research. Several advancements in hardware such as high-speed cameras, together with innovative algorithms and procedures, have extended the scope of PIV to a variety of applications. Westerweel et al. (2013) point out in a recent review article that one of the main advantages of the PIV measurement is its unique ability in measuring quantitatively spatial derivatives of the flow field. With the development of Tomographic PIV introduced by Elsinga et al. (2006), it is now possible to measure simultaneously the distributions of three velocity components in a three-dimensional flow field, thus enabling us to measure all the velocity derivatives of a turbulent flow. However, for a thorough characterization of a turbulent flow, in addition to the velocity gradients, the instantaneous pressure distribution in the 3D flow field also needs to be measured.

305 Measurement of Three-dimensional Velocity Field of Buoyant Jet by Scanning Stereo PIV

2011 ◽  
Vol 2011.48 (0) ◽  
pp. 81-82
Author(s):  
Tomoaki Syutoh ◽  
Nobuyuki Fullsawa ◽  
Tatsuya Gono ◽  
Takayuki Yamagata
Keyword(s):  
Velocity Field ◽  
Three Dimensional ◽  
Buoyant Jet

1503 Three-dimensional velocity-field measurement of inflow phenomenon in buoyant jet at low Froude number

2013 ◽  
Vol 2013.50 (0) ◽  
pp. 150301-150302
Author(s):  
Atsushi MAEDA ◽  
Ai ISHIZUKA ◽  
Ryuta WATANABE ◽  
Takayuki YAMAGATA ◽  
Nobuyuki FUJISAWA
Keyword(s):  
Velocity Field ◽  
Froude Number ◽  
Field Measurement ◽  
Three Dimensional ◽  
Buoyant Jet ◽  
Low Froude Number ◽  
Velocity Field Measurement

Noninvasive Measurement of Time-Varying Three-Dimensional Relative Pressure Fields Within the Human Heart

2002 ◽  
Vol 124 (3) ◽  
pp. 288-293 ◽  
Author(s):  
T. Ebbers ◽  
L. Wigstro¨m ◽  
A. F. Bolger ◽  
B. Wranne ◽  
M. Karlsson
Keyword(s):  
Velocity Field ◽  
Human Heart ◽  
Three Dimensional ◽  
Computational Fluid Mechanics ◽  
Relative Pressure ◽  
Time Resolved ◽  
Pressure Poisson Equation ◽  
Pressure Fields ◽  
Flow Phenomena ◽  
Human Left Ventricle

Understanding cardiac blood flow patterns is important in the assessment of cardiovascular function. Three-dimensional flow and relative pressure fields within the human left ventricle are demonstrated by combining velocity measurements with computational fluid mechanics methods. The velocity field throughout the left atrium and ventricle of a normal human heart is measured using time-resolved three-dimensional phase-contrast MRI. Subsequently, the time-resolved three-dimensional relative pressure is calculated from this velocity field using the pressure Poisson equation. Noninvasive simultaneous assessment of cardiac pressure and flow phenomena is an important new tool for studying cardiac fluid dynamics.

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