scholarly journals Analysis and treatment of errors due to high velocity gradients in particle image velocimetry

2003 ◽  
Vol 35 (5) ◽  
pp. 408-421 ◽  
Author(s):  
P. Meunier ◽  
T. Leweke
Keyword(s):  
Particle Image Velocimetry ◽  
High Velocity ◽  
Particle Image ◽  
Velocity Gradients ◽  
Image Velocimetry

Analysis of local velocity gradients in rapid mixer using particle image velocimetry technique

2002 ◽  
Vol 2 (5-6) ◽  
pp. 47-55
Author(s):  
N.-S. Park ◽  
H. Park
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Velocity Fields ◽  
Local Velocity ◽  
Mixing Condition ◽  
Particle Image Velocimetry Technique ◽  
Velocity Gradients ◽  
Image Velocimetry ◽  
Current Design ◽  
G Value

Recognizing the significance of factual velocity fields in a rapid mixer, this study focuses on analyzing local velocity gradients in various mixer geometries with particle image velocimetry (PIV) and comparing the results of the analysis with the conventional G-value, for reviewing the roles of G-value in the current design and operation practices. The results of this study clearly show that many arguments and doubts are possible about the scientific correctness of G-value, and its current use. This is because the G-value attempts to represent the turbulent and complicated factual velocity field in a jar. Also, the results suggest that it is still a good index for representing some aspects of mixing condition, at least, mixing intensity. However, it cannot represent the distribution of velocity gradients in a jar, which is an important factor for mixing. This study as a result suggests developing another index for representing the distribution to be used with the G-value.

scholarly journals High-Frame-Rate Echo-Particle Image Velocimetry Can Measure the High-Velocity Diastolic Flow Patterns

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
Jason Voorneveld ◽  
Lana B.H. Keijzer ◽  
Mihai Strachinaru ◽  
Daniel J. Bowen ◽  
Jeffrey S.L. Goei ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
High Velocity ◽  
Particle Image ◽  
Flow Patterns ◽  
Frame Rate ◽  
High Frame Rate ◽  
Diastolic Flow ◽  
Image Velocimetry

Stomatopod antennule design: the asymmetry, sampling efficiency and ontogeny of olfactory flicking

2000 ◽  
Vol 203 (24) ◽  
pp. 3795-3808 ◽  
Author(s):  
K.S. Mead ◽  
M.A. Koehl
Keyword(s):  
Particle Image Velocimetry ◽  
Relative Velocity ◽  
Particle Image ◽  
Flow Fields ◽  
Physical Models ◽  
Sampling Efficiency ◽  
Return Stroke ◽  
Velocity Gradients ◽  
Image Velocimetry ◽  
Age Dependent

Many crustaceans detect odors from distant sources using chemosensory sensilla (aesthetascs) on their antennules. The greater the flow of water through arrays of aesthetascs, the faster the access of odorant to receptors inside the aesthetascs. Stomatopods facilitate odorant access by flicking their antennules, thus increasing the relative velocity of the water reaching their aesthetascs. We used dynamically scaled physical models to investigate how aesthetasc size and spacing and antennule flicking velocity affect flow penetration into the simple aesthetasc arrays of the stomatopod Gonodactylaceus mutatus. Particle image velocimetry of flow fields near models of juvenile and adult antennules revealed that velocity gradients around the aesthetascs are steeper during the outward part of the flick than during the return stroke and that the velocity gradients are steeper at the aesthetasc tips than at their bases. More fluid per unit time flows between aesthetasc rows during the outward stroke than during the return stroke, ensuring that odor sampling is pulsatile. During flicking, velocity gradients are steeper near adult aesthetascs than near juvenile aesthetascs, and adults process more fluid per unit time than juveniles. The resulting differences in odorant access can be related to size- and age-dependent changes in stomatopod ecology.

scholarly journals High Frame Rate Ultrasound Particle Image Velocimetry for Estimating High Velocity Flow Patterns in the Left Ventricle

2018 ◽  
Vol 65 (12) ◽  
pp. 2222-2232 ◽  
Author(s):  
Jason Voorneveld ◽  
Aswin Muralidharan ◽  
Timothy Hope ◽  
Hendrik J. Vos ◽  
Pieter Kruizinga ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Left Ventricle ◽  
High Velocity ◽  
Particle Image ◽  
Flow Patterns ◽  
Frame Rate ◽  
High Frame Rate ◽  
High Velocity Flow ◽  
Image Velocimetry ◽  
Velocity Flow

CHARACTERIZATION OF FIRE SPRINKLER SPRAYS USING PARTICLE IMAGE VELOCIMETRY

2005 ◽  
Vol 15 (3) ◽  
pp. 341-362 ◽  
Author(s):  
David T. Sheppard ◽  
Richard M. Lueptow
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Image Velocimetry ◽  
Fire Sprinkler
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