PIV Measurement of Velocity Field and Visualization of Mixing Mechanism in a Blade-free Planetary Mixer

2018 ◽  
Vol 2018 (0) ◽  
pp. YC2018-042
Author(s):  
Tomoyuki MATSUZAWA ◽  
Takayuki YAMAGATA ◽  
Nobuyuki FUJISAWA ◽  
Hiroshi TOKUNAGA ◽  
Tomiharu MORIMOTO
Keyword(s):  
Velocity Field ◽  
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.

scholarly journals PIV Measurement of Red Blood Cell Velocity Field in Microvessels

2002 ◽  
Vol 22 (1Supplement) ◽  
pp. 25-28
Author(s):  
Yasuhiko SUGII ◽  
Shigeru NISHIO ◽  
Koji OKAMOTO
Keyword(s):  
Velocity Field ◽  
Blood Cell ◽  
Red Blood Cell ◽  
Cell Velocity ◽  
Piv Measurement ◽  
Red Blood Cell Velocity

Stereo-PIV Measurement of Cross-sectional Velocity Field in 90° Elbow

2017 ◽  
Vol 2017.54 (0) ◽  
pp. A022
Author(s):  
Takaaki SUGIYAGI ◽  
Nobuyuki FUJISAWA ◽  
Takayuki YAMAGATA
Keyword(s):  
Velocity Field ◽  
Cross Sectional ◽  
Piv Measurement

PIV measurement of velocity field in a spray combustor

2003 ◽  
Vol 6 (3) ◽  
pp. 273-281 ◽  
Author(s):  
S. Tomimatsu ◽  
N. Fujisawa ◽  
A. Hosokawa
Keyword(s):  
Velocity Field ◽  
Piv Measurement

Passive control of the flow-induced noise from a rectangular cylinder using porous walls

2021 ◽  
Vol 263 (2) ◽  
pp. 4219-4225
Author(s):  
Reon Nishikawa
Keyword(s):  
Velocity Field ◽  
Porous Material ◽  
Passive Control ◽  
Maximum Velocity ◽  
Slip Boundary Condition ◽  
Low Noise ◽  
Aerodynamic Sound ◽  
Piv Measurement ◽  
Flow Induced Noise ◽  
Aluminum Plates

A noise reducing technique for the flow-induced noise using a porous material was studied experimentally and numerically. In the experiment, flow-induced noises emitted from three types of rectangular cylinders were measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and others were made of two or three aluminum plates. Measurement results show that the frequency of the distinct tonal noise was different among three cylinders, that frequency was higher for using porous material. It was also found that the sound pressure lelvel of the noise was also different and that of the cylinder using two porous material plates was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using two porous material plates. It is assumed that the change of aerodynamic sound was caused by that change in velocity field. In the numerical simulation, we could simulate changes of the emitted noise and the wake of the cylinder by applying the slip boundary condition of the velocity to the wall of the cylinder.

On the Passive Noise Control of the Flow-Induced Noise Using Porous Materials

2020 ◽  
Author(s):  
Reon Nishikawa ◽  
Osamu Terashima ◽  
Ayumu Inasawa
Keyword(s):  
Velocity Field ◽  
Porous Material ◽  
Noise Control ◽  
Maximum Velocity ◽  
Low Noise ◽  
Control Technique ◽  
Aerodynamic Sound ◽  
Piv Measurement ◽  
Flow Induced Noise ◽  
Passive Noise

Abstract A passive noise control technique for the flow-induced noise using a porous material was studied experimentally. The purpose of this study was to decrease the aerodynamic sound using porous material that permeated only sound and clarify that reduction mechanism. In the experiment, flow-induced noises emitted from two types of rectangular cylinders was measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and the other was two aluminum and porous material plates each. Measurement results show that the frequency of the distinct tonal noise was different between two cylinders, that frequency was higher for using porous material. It was also found that the sound pressure level of the noise was also different and that of the cylinder using porous material plate was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using porous material. It is assumed that the change of aerodynamic sound was caused by that change in velocity field.

PIV Measurement of the Fluidized Particles’ Velocity Field in a Cylindrical Spouted Bed

2012 ◽  
Vol 560-561 ◽  
pp. 632-636
Author(s):  
Peng Fei Gao ◽  
Bin Yang ◽  
Ming Gong ◽  
Xiao Xun Ma
Keyword(s):  
Velocity Field ◽  
Flow Field ◽  
Vertical Direction ◽  
Packed Bed ◽  
Similar Distribution ◽  
Spouted Bed ◽  
Face To Face ◽  
Piv Measurement ◽  
Particle Velocities ◽  
Fluidized Particles

In this paper, the instantaneous velocity fields of the particles in the spouted bed were measured by the particle image velocimetry (PIV). In the experiment, the spouted particles achieved the visible accumulation effect when the fountain height was 0.85 times of the packed bed height h. Since the particles are dispersed with each other, the PIV recordings were evaluated by the multiple-pass recursive method based on the FFT cross-correlation algorithm. The time-averaged velocity field of the particles obtained from the PIV experiment had similar distribution with the velocity field calculated by the numerical simulation. In the averaged particle velocity field, there was a continuous region which divided the whole flow field into two parts. The particle velocities in the region approximated to zero especially in vertical direction, which means the particles with upwards motion were basically equated to those with downwards motion in the region. Therefore the effects of particles’ face-to-face friction and even abrasion were much stronger in the region. Further, the experimental results also show that the area of the region could be about 11.19% of the whole flow field.

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