Neutron radiography on tubular flow reactor for hydrothermal synthesis: In situ monitoring of mixing behavior of supercritical water and room-temperature water

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• 作者：Seiichi Takami^a ; ^{stakami@tagen.tohoku.ac.jp} ; Ken-ichi Sugioka^b ; Takao Tsukada^b ; Tadafumi Adschiri^a ; ^c ; Katsumi Sugimoto^d ; Nobuyuki Takenaka^d ; Yasushi Saito^e
• 关键词：Neutron radiography ; In situ monitoring ; Mixing ; Tubular flow reactor ; Water density ; Hydrothermal synthesis
• 刊名：The Journal of Supercritical Fluids
• 出版年：2012
• 期刊代码：60_08968446
• 类别：ce
• 出版时间：March, 2012
• 卷：63
• 期：Complete
• 页码：46-51
• 文件大小：876 K

摘要

Neutrons are effectively scattered by hydrogen atoms and have high permeability in heavier elements including Fe, Cr, and Ni. Therefore, neutron radiography should enable the detection of differences in water density in a stainless-steel reactor. To test this, we performed neutron radiography on a tubular flow reactor for supercritical hydrothermal synthesis and visualized the mixing behavior of supercritical water and room-temperature water at a T-junction. The results showed that the difference in density between supercritical water and room-temperature water, as well as how the density changed during mixing, was clearly visualized. The partitioned flow in the side tube was also visualized while feeding room-temperature water. The results indicated the importance of buoyancy forces, as discussed by others in previous reports.