TY - GEN
T1 - High frame-rate neutron radiography for visualization and measurement of gas-liquid two-phase flow in a metallic rectangular duct
AU - Hibiki, Takashi
AU - Mishima, Kaichiro
AU - Tsuruno, Akira
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 1995
Y1 - 1995
N2 - In order to apply neutron radiography (NR) technique to fluid research, high frame-rate NR with a steady thermal neutron beam was developed by gathering up-to-date technologies for neutron source, scintillator, high-speed video and image intensifier. This imaging system has many advantages such as a long recording-time (up to 21 minutes), high frame-rate (up to 1000 frames/s) imaging and no necessity of triggering signal. Visualization of air-water two-phase flow in a metallic rectangular duct was achieved at the recording speeds of 250, 500 and 1000 frames/s. The qualities of those consecutive images were good enough to observe the flow mechanism and to measure the flow characteristics. It was demonstrated that some characteristics of two-phase flow could be measured by using the present imaging system. Concerning the quantification of utilizing geometrical information from NR images, measurements of flow regime, rising velocity of bubbles and extraction of wave shape in annular flow were performed by using the image processing technique. Concerning the quantification of utilizing attenuation characteristics of neutron in materials measurements of average void fraction and void profile were conducted. It was confirmed that this new technique may have significant advantages both in visualizing and measuring high-speed fluid phenomena when the ordinary methods such as an optical method and X-ray radiography can not be applicable.
AB - In order to apply neutron radiography (NR) technique to fluid research, high frame-rate NR with a steady thermal neutron beam was developed by gathering up-to-date technologies for neutron source, scintillator, high-speed video and image intensifier. This imaging system has many advantages such as a long recording-time (up to 21 minutes), high frame-rate (up to 1000 frames/s) imaging and no necessity of triggering signal. Visualization of air-water two-phase flow in a metallic rectangular duct was achieved at the recording speeds of 250, 500 and 1000 frames/s. The qualities of those consecutive images were good enough to observe the flow mechanism and to measure the flow characteristics. It was demonstrated that some characteristics of two-phase flow could be measured by using the present imaging system. Concerning the quantification of utilizing geometrical information from NR images, measurements of flow regime, rising velocity of bubbles and extraction of wave shape in annular flow were performed by using the image processing technique. Concerning the quantification of utilizing attenuation characteristics of neutron in materials measurements of average void fraction and void profile were conducted. It was confirmed that this new technique may have significant advantages both in visualizing and measuring high-speed fluid phenomena when the ordinary methods such as an optical method and X-ray radiography can not be applicable.
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M3 - RGC 32 - Refereed conference paper (with host publication)
VL - 209
T3 - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
SP - 243
EP - 250
BT - Flow Vizualization and Image Processing of Multiphase Systems
PB - American Society of Mechanical Engineers
T2 - Proceedings of the 1995 ASME/JSME Fluids Engineering and Laser Anemometry Conference and Exhibition
Y2 - 13 August 1995 through 18 August 1995
ER -