1997 Fiscal Year Annual Research Report

プローブとして熱中性子を用いた高速熱流動現象の詳細構造計測に関する研究

Research Project

Project/Area Number	07408011
Research Institution	KYOTO UNIVERSITY
Principal Investigator	西原英晃京都大学, 原子炉実験所, 教授 (50025920)
Co-Investigator(Kenkyū-buntansha)	齊藤泰司京都大学, 原子炉実験所, 教務職員 (40283684) 藤根成勲京都大学, 原子炉実験所, 助手 (90027441) 日引俊京都大学, 原子炉実験所, 助教授 (30228746) 三島嘉一郎京都大学, 原子炉実験所, 教授 (60027472) 神田啓治京都大学, 原子炉実験所, 教授 (10027419)
Keywords	中性子ライオグラフィ / 高速度撮像 / 可視化 / 画像処理 / ボイド率 / 混相流 / 熱流動 / シビアアクシデント
Research Abstract	X線(或いは、γ線)ラジオグラフィと相補的な特性を有する中性子ラジオグラフィ(Neutron Radiography:NR)を精級な計測技法とするため撮像技術の高度化(高時間分解能化)、高精度計測法(Σスケーリング法)の開発、計測限界の評価に関する検討を行い、熱流体科学分野への応用として次の結果を得た。 (1)撮像技術の高度化本研究では1000frame/s(従来の撮像速度は30frame/s)で撮像可能な高感度撮像系を構築し、定常熱中性子束を用いた金属管内気液二相流の高速度撮像に世界で初めて成功した。また、低中性子束場における中性子数の計測誤差解析とコンバータの光減衰特性からNRの限界時間分解能を明らかにした。 (2)画像定量化法の開発散乱中性子補正法(Σスケーリング法)を提案し、ボイド率計測法を確立した。Σスケーリング法の妥当性は、NR実験、モンテカルロ法による数値実験、炉物理的モデルにより検証した。また、画像処理法を用いてNR画像から流動様式、気泡上昇速度、気泡径分布、界面面積、液相速度場等の流れの計測が可能であることを示した。 (3)熱流動現象への応用熱流動現象への応用研究として、狭間隙矩形管内空気-水垂直上昇二相流の可視化、細管内空気-水垂直上昇二相流のボイド率計測、水蒸気爆発の粗混合過程の可視化と計測、高速炉シビアアクシデントに関連した液体金属-窒素ガス高密度比二相流の可視化と計測を行った。

Research Products
(31 results)

All Other

All Publications (31 results)

[Publications] T.Hibiki et al.: "Application of High Frame-Rate Neutron Radiography with a Steady Thermal Neutron Beam to Two-phase Flow Measurements in a Metallic Rectangular Duct" Nuclear Technology. 110. 422-435 (1995)
[Publications] K.Mishima et al.: "Effect of Inner Diameter on Some Characteristics of Air-Water Two-Phase Flows in Capillary Tubes" Transactions of the Japan Society of Mechanical Engineers. 61. 3197-3204 (1995)
[Publications] K.Mishima et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts by Neutrons as Microscopic Probes (lst Report.Time-resolved Neutron Radiography and lts Limited Time-resolution)" Transactions of the Japan Society of Mechanical Engineers. 61. 3959-3966 (1995)
[Publications] K.Mishima et al.: "Some Characteristics of Air-Water Flow in Small Diameter Tubes" Proceedings of the International Conference on Multiphase Flows '95-Kyoto,April 3-7,1995,Kyoto,Japan. 3. P4-39-P4-45 (1995)
[Publications] T.Hibiki et al.: "High Frame-Rate Neutron Radiography for Visualization and Measurement of Gas-Liquid Two-phase Flow in a Metallic Rectangular Duct" Proceedings of the 2nd Joint ASME/JSME Fluids Engineering Conference August 13-18,South Carolina,USA. 209. 243-250 (1995)
[Publications] K.Mishima et al.: "Development of Temporally-Resolved Neutron Radiography Methods for Visualization of High-Speed Transient Fluid Phenomena" Proceedings of the Second International Topical Meeting on Neutron Radiogroplry System Design and Charocterization,Nov.12-15,1995,Shonan Village Center/Rikkyo University,Hayama,Japan. 309-315 (1995)
[Publications] T.Hibiki et al.: "Measurement of Radial Void Distribution of Two-Phase Flow in a Round Tube by Using Neutrons as a Probe" Proceedings of the Second International Topical Meeting on Neutron Radiography System Design and Charocterization,Nov.12-15,1995,Shonan Village Center/Rikkyo University,Hayama,Japan. 316-323 (1995)
[Publications] T.Hibiki et al.: "Feasibility of High Frame-Rate Neutron Radiography by Using a Steaby Thermal Neutron Beam with 10^6n/(cm^2-S)Flux" Nuclear Instruments and Methods in Physics Research. A369. 186-194 (1996)
[Publications] K.Mishima et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts by Neutrons as Microscopic Probes (2nd Report.Measurements of Some Flow Characteristics Using Imagc Processing Techniques)" Transactions of the Japan Society of Mechanical Engineers. 62. 137-144 (1996)
[Publications] K.Mishima et al.: "Quantitative-Measurement Limits of Thermal and Fluid Phenomena Using Neutron Attenuation Characteristics in Materials" International Journal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics,Experimental Thermal and Fluid Science. 12. 461-472 (1996)
[Publications] T.Hibiki et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts Using Neutrons as Microscopic Probes (3rd Report.Quantiative Method of Neutroo Radiography lmage)" Transactions of the Japan Society of Mechanical Engineers. 62. 919-926 (1996)
[Publications] K.Mishima et al.: "Some Characteristics of Air-Water Two-Phase Flow in Small Diameter Vertical Tubes" International Journal of Multiphase Flow. 22. 703-712 (1996)
[Publications] K.Mishima et al.: "Quantitative Method to Measure Void Fraction of Two-Phase Flow Using Electronic Imaging with Neutrons" Nuclear Science and Engineering. 124. 327-338 (1996)
[Publications] T.Hibiki et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts Using Neutrons as Microscopic Probes (4th Report.Effect of lmage Gray-Scak and Pirel-Number on Image Quantification)" Transactions of the Japan Society of Mechanical Engineers. 62. 1781-1787 (1996)
[Publications] T.Hibiki et al.: "Approximate Method for Measurement of Phase-Distribution in Muluphase Materials with Smsll Neutron-Attenuation Using a Neutron Beam as a Probe" Nuclear Instruments and Methods in Physics Research. A374. 345-351 (1996)
[Publications] T.Hibiki et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts Using Neutrons as Microscopic Probes (5th Report.Radial Void Distribution Measurement Method of Two-Phase Flow in a Round Tube)" Transactions of the Japan Society of Mechanical Engineers. 62. 3002-3008 (1996)
[Publications] K.Mishima et al.: "Visualization and Measurement of Two-Phase Flow by Using Neutron Radiography" Proceedings of the Fifth Japan-US Seminar on Two-Phase Flow Dynamics,1996. 339-346 (1996)
[Publications] K.Mishima et al.: "Visualization Study of Molten Metal-Water Interaction by Using Neutron Radiography" Proceedings of the Workshop on Severe Accident Research in Japan,Oct.28-30,1996,Tokyo,Japan. (1996)
[Publications] T.Hibiki et al.: "Measurement of Radial Void Fraction Distribution of Two-Phase Flow in a Metallic Round Tube Using Neutrons as Microscopic Probes" Nuclear Instruments and Methods in Physics Research. A399. 432-438 (1997)
[Publications] T.Hibiki et al.: "Influence of Scattered Neutrons on Void Fraction Measurement of Two-Phase Flow Using Real-Time Thermal Neutron Radiography" Journal of Nuclear Science and Technology. 34. 996-1005 (1997)
[Publications] T.Hibiki et al.: "Prediction of Measurement Error Due to Low Gray-Scale and Spatial-Resoluoon of an Imaging System on Quantification of Neutron Radiographic lmage" Nuclear Instruments and Methods in Physics Research. A388. 204-211 (1997)
[Publications] K.Mishima et al.: "Visualization and Measurement of Two-Phase Flow by Using Neutron Radiography" Nuclear Engineering and Design. 175. 25-35 (1997)
[Publications] K.Mishima et al.: "Development of High-Frame-Rate Neutron Radioscopy and Quantitative Measurement Method for Multiphase Flow Research" Proc.OECD/CSNI Specialist Meeting on Advanced Instrumentation and Measurement Techniques,Santa Barbara,CA,March 17-20,1997. (1997)
[Publications] K.Mishima et al.: "High-Frame-Rate Neutron Radioscopy with a Steady Thermal Neutron Beam" Neutron Radiography(5),DGZfP,Germany. 140-147 (1997)
[Publications] T.Hibiki et al.: "Influence of Scattered Neutrons on Void Fraction Measurement of Two-Phase Flow Using Neutron Radioscopy" Neutron Radiography(5),DGZfP,Germany. 132-139 (1997)
[Publications] H.Unesaki et al.: "Evaluation of Scattered Neutron Component in Thermal Neutron Radiography Image-Influence of Scatterd Neutrons and Unparallelness of Incident Neutron Ream" Neutron Radiography(5),DGZfP,Germany. 175-182 (1997)
[Publications] H.Unesaki et al.: "Verification of Neutron Radioscopic Measurement of Void Fraction by Monte Carlo Simulation" Neutron Radiography(5),DGZfP,Germany. 168-174 (1997)
[Publications] H.Nakamura et al.: "High-Frame-Rate Video Visualization of Simulated Lower Head Behavior during TMI Accident Using High-Frame-Rate Neutron Radioscopy with a Steady Ncutron Beam" Neutron Radiography(5),DGZfP,Germany. 665-672 (1997)
[Publications] J.T.Lindsay et al.: "Coking Determination in Gas Turbine Engine Nozzles Using Neutron Radiography" Neutron Radiography(5),DGZfP,Germany. 571-577 (1997)
[Publications] K.Mishima et al.: "Visualization Study of Molten Metal-Water Interaction by Using Neutron Radiography" Proceeding of International Seminar on Vapor Explosions and Explosive Eruptions,May 22-24,1997,Sendai,Japan. (1997)
[Publications] H.Unesaki et al.: "Verification of Neutron Radiographic Measurement of Void Fraction by Monte Carlo Simulation" Nuclear Instruments and Methods in Physics Research. (in print). (1998)

1997 Fiscal Year Annual Research Report

プローブとして熱中性子を用いた高速熱流動現象の詳細構造計測に関する研究

Principal Investigator

西原 英晃 京都大学, 原子炉実験所, 教授 (50025920)

Research Products

[Publications] T.Hibiki et al.: "Application of High Frame-Rate Neutron Radiography with a Steady Thermal Neutron Beam to Two-phase Flow Measurements in a Metallic Rectangular Duct" Nuclear Technology. 110. 422-435 (1995)

[Publications] K.Mishima et al.: "Effect of Inner Diameter on Some Characteristics of Air-Water Two-Phase Flows in Capillary Tubes" Transactions of the Japan Society of Mechanical Engineers. 61. 3197-3204 (1995)

[Publications] K.Mishima et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts by Neutrons as Microscopic Probes (lst Report.Time-resolved Neutron Radiography and lts Limited Time-resolution)" Transactions of the Japan Society of Mechanical Engineers. 61. 3959-3966 (1995)

[Publications] K.Mishima et al.: "Some Characteristics of Air-Water Flow in Small Diameter Tubes" Proceedings of the International Conference on Multiphase Flows '95-Kyoto,April 3-7,1995,Kyoto,Japan. 3. P4-39-P4-45 (1995)

[Publications] T.Hibiki et al.: "High Frame-Rate Neutron Radiography for Visualization and Measurement of Gas-Liquid Two-phase Flow in a Metallic Rectangular Duct" Proceedings of the 2nd Joint ASME/JSME Fluids Engineering Conference August 13-18,South Carolina,USA. 209. 243-250 (1995)

[Publications] T.Hibiki et al.: "Feasibility of High Frame-Rate Neutron Radiography by Using a Steaby Thermal Neutron Beam with 10^6n/(cm^2-S)Flux" Nuclear Instruments and Methods in Physics Research. A369. 186-194 (1996)

[Publications] K.Mishima et al.: "Quantitative-Measurement Limits of Thermal and Fluid Phenomena Using Neutron Attenuation Characteristics in Materials" International Journal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics,Experimental Thermal and Fluid Science. 12. 461-472 (1996)

[Publications] T.Hibiki et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts Using Neutrons as Microscopic Probes (3rd Report.Quantiative Method of Neutroo Radiography lmage)" Transactions of the Japan Society of Mechanical Engineers. 62. 919-926 (1996)

[Publications] K.Mishima et al.: "Some Characteristics of Air-Water Two-Phase Flow in Small Diameter Vertical Tubes" International Journal of Multiphase Flow. 22. 703-712 (1996)

[Publications] K.Mishima et al.: "Quantitative Method to Measure Void Fraction of Two-Phase Flow Using Electronic Imaging with Neutrons" Nuclear Science and Engineering. 124. 327-338 (1996)

[Publications] T.Hibiki et al.: "Visualization and Measurements of Two-Phase Flows in Metallic Ducts Using Neutrons as Microscopic Probes (4th Report.Effect of lmage Gray-Scak and Pirel-Number on Image Quantification)" Transactions of the Japan Society of Mechanical Engineers. 62. 1781-1787 (1996)

[Publications] T.Hibiki et al.: "Approximate Method for Measurement of Phase-Distribution in Muluphase Materials with Smsll Neutron-Attenuation Using a Neutron Beam as a Probe" Nuclear Instruments and Methods in Physics Research. A374. 345-351 (1996)

[Publications] K.Mishima et al.: "Visualization and Measurement of Two-Phase Flow by Using Neutron Radiography" Proceedings of the Fifth Japan-US Seminar on Two-Phase Flow Dynamics,1996. 339-346 (1996)

[Publications] K.Mishima et al.: "Visualization Study of Molten Metal-Water Interaction by Using Neutron Radiography" Proceedings of the Workshop on Severe Accident Research in Japan,Oct.28-30,1996,Tokyo,Japan. (1996)

[Publications] T.Hibiki et al.: "Measurement of Radial Void Fraction Distribution of Two-Phase Flow in a Metallic Round Tube Using Neutrons as Microscopic Probes" Nuclear Instruments and Methods in Physics Research. A399. 432-438 (1997)

[Publications] T.Hibiki et al.: "Influence of Scattered Neutrons on Void Fraction Measurement of Two-Phase Flow Using Real-Time Thermal Neutron Radiography" Journal of Nuclear Science and Technology. 34. 996-1005 (1997)

[Publications] T.Hibiki et al.: "Prediction of Measurement Error Due to Low Gray-Scale and Spatial-Resoluoon of an Imaging System on Quantification of Neutron Radiographic lmage" Nuclear Instruments and Methods in Physics Research. A388. 204-211 (1997)

[Publications] K.Mishima et al.: "Visualization and Measurement of Two-Phase Flow by Using Neutron Radiography" Nuclear Engineering and Design. 175. 25-35 (1997)

[Publications] K.Mishima et al.: "Development of High-Frame-Rate Neutron Radioscopy and Quantitative Measurement Method for Multiphase Flow Research" Proc.OECD/CSNI Specialist Meeting on Advanced Instrumentation and Measurement Techniques,Santa Barbara,CA,March 17-20,1997. (1997)

[Publications] K.Mishima et al.: "High-Frame-Rate Neutron Radioscopy with a Steady Thermal Neutron Beam" Neutron Radiography(5),DGZfP,Germany. 140-147 (1997)

[Publications] T.Hibiki et al.: "Influence of Scattered Neutrons on Void Fraction Measurement of Two-Phase Flow Using Neutron Radioscopy" Neutron Radiography(5),DGZfP,Germany. 132-139 (1997)

[Publications] H.Unesaki et al.: "Evaluation of Scattered Neutron Component in Thermal Neutron Radiography Image-Influence of Scatterd Neutrons and Unparallelness of Incident Neutron Ream" Neutron Radiography(5),DGZfP,Germany. 175-182 (1997)

[Publications] H.Unesaki et al.: "Verification of Neutron Radioscopic Measurement of Void Fraction by Monte Carlo Simulation" Neutron Radiography(5),DGZfP,Germany. 168-174 (1997)

[Publications] H.Nakamura et al.: "High-Frame-Rate Video Visualization of Simulated Lower Head Behavior during TMI Accident Using High-Frame-Rate Neutron Radioscopy with a Steady Ncutron Beam" Neutron Radiography(5),DGZfP,Germany. 665-672 (1997)

[Publications] J.T.Lindsay et al.: "Coking Determination in Gas Turbine Engine Nozzles Using Neutron Radiography" Neutron Radiography(5),DGZfP,Germany. 571-577 (1997)

[Publications] K.Mishima et al.: "Visualization Study of Molten Metal-Water Interaction by Using Neutron Radiography" Proceeding of International Seminar on Vapor Explosions and Explosive Eruptions,May 22-24,1997,Sendai,Japan. (1997)

[Publications] H.Unesaki et al.: "Verification of Neutron Radiographic Measurement of Void Fraction by Monte Carlo Simulation" Nuclear Instruments and Methods in Physics Research. (in print). (1998)

西原英晃京都大学, 原子炉実験所, 教授 (50025920)