Ultrasonic Measurement of Velocity Distribution on Counter-Current Bubbly Flow

2019 ◽  
Vol 2019.24 (0) ◽  
pp. A225
Author(s):  
Wongsakorn WONGSAROJ ◽  
Hideharu TAKAHASHI ◽  
Natee THONG-UN ◽  
Hiroshige KIKURA
Keyword(s):  
Velocity Distribution ◽  
Bubbly Flow ◽  
Ultrasonic Measurement ◽  
Counter Current

scholarly journals Ultrasonic Measurement for the Experimental Investigation of Velocity Distribution in Vapor-Liquid Boiling Bubbly Flow

2021 ◽  
Vol 12 (1) ◽  
pp. 16-28
Author(s):  
Wongsakorn Wongsaroj ◽  
Hideharu Takahashi ◽  
Natee Thong-Un ◽  
Hiroshige Kikura
Keyword(s):  
Velocity Distribution ◽  
Pipe Flow ◽  
Pipe Wall ◽  
Bubbly Flow ◽  
Ultrasonic Measurement ◽  
Subcooled Boiling ◽  
Vertical Pipe ◽  
Two Phase ◽  
Flow Apparatus ◽  
Vapor Liquid

This study proposes an ultrasonic velocity profiler (UVP) with a single ultrasonic gas-liquid two-phase separation (SUTS) technique to measure the velocity distribution of vapor-liquid boiling bubbly flow. The proposed technique is capable of measuring the velocity of the vapor bubble and liquid separately in boiling conditions. To confirm the viability of the measurement technique, the experiment is conducted on vertical pipe flow apparatus. The ultrasonic transmission and effect of ultrasonic refraction through the pipe wall and water are investigated at ambient temperature until subcooled boiling temperature is reached. The velocity profile in the water at elevated temperature is measured to verify the ability of the technique in this application. The bubbly flow velocity distribution measurement in boiling conditions is then demonstrated. The results show that the proposed technique can effectively investigate the velocity of both phases under various fluid conditions in boiling bubbly flow.

Tomographic imaging of counter-current bubbly flow by wire mesh tomography

2007 ◽  
Vol 130 (2-3) ◽  
pp. 111-118 ◽  
Author(s):  
N FUANGWORAWONG ◽  
H KIKURA ◽  
M ARITOMI ◽  
T KOMENO
Keyword(s):  
Bubbly Flow ◽  
Tomographic Imaging ◽  
Wire Mesh ◽  
Counter Current

Flow Past Two Cylinders Arranged in Tandem Within a Microbubble Plume

2019 ◽  
Author(s):  
Tomomi Uchiyama ◽  
Ryota Kano ◽  
Tomohiro Degawa ◽  
Kotaro Takamure
Keyword(s):  
Velocity Distribution ◽  
Water Flow ◽  
Bubbly Flow ◽  
Water Electrolysis ◽  
Shear Layers ◽  
Bubble Velocity ◽  
Flow Past ◽  
Mean Diameter ◽  
Bubbly Wake

Abstract This study investigates the flow past two cylinders arranged in tandem within a microbubble plume inside a tank. Microbubbles with a mean diameter of 0.055 mm are released by water electrolysis from electrodes placed at the bottom of the tank. Upon rising, these microbubbles induce an upward water flow around them due to buoyancy. Orthogonally to the axis of this microbubble plume, two cylinders with a diameter D of 30 mm are arranged in tandem. The distance between the cylinders, L, ranges between 1.5D and 3D. The bubbles and the water flow around the cylinders are visualized, and the bubble velocity distribution is measured. The experiments reveal the water and bubble shear layers originating at the sides of the lower cylinder, and allow the elucidation of their behavior around the upper cylinder. Furthermore, this study makes clear the effects of L on the flow around the two cylinders, such as the stagnant bubbly flow and the bubbly wake.

Microstructure of the flow field around a bubble in counter-current bubbly flow

2002 ◽  
Vol 26 (2-4) ◽  
pp. 221-227 ◽  
Author(s):  
Yumiko Suzuki ◽  
Masamichi Nakagawa ◽  
Masanori Aritomi ◽  
Hideki Murakawa ◽  
Hiroshige Kikura ◽  
...  
Keyword(s):  
Flow Field ◽  
Bubbly Flow ◽  
Counter Current

2D Velocity Vector Profile Measurement and Phase Separation on Swirling Bubbly Flow Using Ultrasound Technique

2019 ◽  
Author(s):  
Wongsakorn Wongsaroj ◽  
Hideharu Takahashi ◽  
Hiroshige Kikura ◽  
Natee Thong-un
Keyword(s):  
Velocity Distribution ◽  
Velocity Vector ◽  
Nuclear Reactor ◽  
Bubbly Flow ◽  
Profile Measurement ◽  
Vertical Pipe ◽  
Two Phase ◽  
Ultrasound Technique ◽  
Image Velocimetry ◽  
Flow Apparatus

Abstract Two-phase swirling bubbly flow is a complex phenomenon which occurs in several industries such as a nuclear reactor. Its characteristic is indispensably necessary to be investigated especially the multi-dimensional velocity distribution. This present paper describes the development of Ultrasonic Velocity Profiler (UVP) method which is a noninvasive measurement and needless of optical access, to obtain a two dimensional (2D) velocity distribution of the bubble and liquid phase in swirling bubbly flow simultaneously. The measurement result is represented in the form of the 2D velocity vector. To achieve the target, the multiple transducers and developed signal processing have been applied to the UVP system to measure a 2D velocity vector affected by bubble and liquid separately. For confirming the ability of Developed-UVP, the experiment was conducted on a vertical pipe co-current flow apparatus. The UVP measurement was demonstrated non-intrusively and without the optical requirement. The measurement applicability of Developed-UVP was evaluated by comparing with Particle Image Velocimetry (PIV) method on liquid flow and bubbly flow. Then, it was applied to obtain the 2D velocity vector in swirling bubbly flow. The velocity vector of the bubble and liquid could be separated clearly. Also, velocity distribution in swirling motion which was interacted of both phases was investigated understandably by using this measurement technique.

Dynamics of comets in the collapsing protosolar nebula

1999 ◽  
Vol 173 ◽  
pp. 45-50
Author(s):  
L. Neslušan
Keyword(s):  
Solar System ◽  
Velocity Distribution ◽  
Oort Cloud ◽  
Interstellar Clouds ◽  
Protosolar Nebula ◽  
Moving Bodies

AbstractComets are created in the cool, dense regions of interstellar clouds. These macroscopic bodies take place in the collapse of protostar cloud as mechanically moving bodies in contrast to the gas and miscroscopic dust holding the laws of hydrodynamics. In the presented contribution, there is given an evidence concerning the Solar system comets: if the velocity distribution of comets before the collapse was similar to that in the Oort cloud at the present, then the comets remained at large cloud-centric distances. Hence, the comets in the solar Oort cloud represent a relict of the nebular stage of the Solar system.

VELOCITY DISTRIBUTION EFFECTS IN AIR FILTER TESTING

2001 ◽  
Vol 19 (1) ◽  
pp. 1-21 ◽  
Author(s):  
FRANK CHAMBERS ◽  
ABDEL AL-SARKHI ◽  
SHENGHONG YAO
Keyword(s):  
Velocity Distribution ◽  
Air Filter
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