A study on a lobed jet mixing flow by using stereoscopic particle image velocimetry technique

2001 ◽  
Vol 13 (11) ◽  
pp. 3425-3441 ◽  
Author(s):  
Hui Hu ◽  
Tetsuo Saga ◽  
Toshio Kobayashi ◽  
Nobuyuki Taniguchi
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Stereoscopic Particle Image Velocimetry ◽  
Particle Image Velocimetry Technique ◽  
Jet Mixing ◽  
Image Velocimetry ◽  
Lobed Jet

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.

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