Study on molecular diffusion behavior in stratified stable density layer of two component gases with natural convection

自然对流二组分气体分层稳定密度层分子扩散行为研究

• 批准号: 20560207
• 负责人: TAKEDA Tetsuaki
• 金额: $ 2.83万
• 依托单位: University of Yamanashi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20560207/
• 关键词: 分子拡散; 自然対流; 自然循環流; 二成分気体; 鉛直流体層; 熱流動数値解析

This study is to investigate an effect of natural convection on mixing processes by molecular diffusion in a vertical stable stratified fluid layer consisting of two component gases. The experiment has been performed regarding the combined phenomena of molecular diffusion and natural convection in two vertical slots which consists of the heated slot and the other side cooled slot. The density change of the gas mixture in the top of slot was obtained and the mixing process when the heavier gas ingress into the vertical slot filled with the lighter gas from the bottom side of the slot was discussed. It was found that natural convection affects an amount of transported gas more than molecular diffusion, even if a temperature difference is so small. The onset time of natural circulation becomes short by the localized natural convection ; therefore the mixing process of two component gases becomes more complex phenomena by molecular diffusion, natural convection and natural circulation.

本研究探讨自然对流对垂直稳定二组份气体分层流体层中分子扩散混合过程之影响。实验研究了由加热槽和冷却槽组成的两个垂直槽中分子扩散和自然对流的复合现象。得到了垂直缝槽顶部混合气体的密度变化，讨论了较重气体从缝槽底部进入填充较轻气体的垂直缝槽时的混合过程。发现自然对流比分子扩散更影响输送气体的量，即使温差如此小。局部自然对流使自然循环的开始时间变短，从而使两组分气体的混合过程由分子扩散、自然对流和自然循环三个过程组成，成为一个复杂的现象。

项目成果

Transport process by natural convection and molecular diffusion of two component gases in a stratified fluid layer

分层流体层中两种组分气体的自然对流和分子扩散的传输过程

• 发表时间: 2011
• 期刊: Proceedings of the 8th ASME-JSME Thermal Engineering Joint Conference, AJTEC2011(Honolulu, Hawaii,USA) JTEC2011-44409
• 作者: 武田哲明;磯見宙孝;花沢大樹
• 通讯作者: 花沢大樹

Effectiveness of natural convection on molecular diffusion of two component gases in a vertical fluid layer

自然对流对垂直流体层中两种组分气体分子扩散的有效性

• 发表时间: 2010
• 期刊: Proceedings of the 5th Topical Meeting on High Temperature Technology, HTR2010(Prague, Czech Republic) PaperO38
• 作者: 武田哲明;磯見宙孝;花沢大樹;鳥山孝司
• 通讯作者: 鳥山孝司

超高温ガス炉の減圧事故時における気体混合現象に関する研究

超高温气体反应堆泄压事故中气体混合现象研究

• 发表时间: 2011
• 作者: 武田哲明;磯見宙孝;花沢大樹;水野弘基
• 通讯作者: 水野弘基

鉛直流体層内の二成分気体混合過程の研究(二成分気体の密度差が大きい場合)

垂直流层内二组分气体混合过程研究（二组分气体密度差较大时）

• 发表时间: 2009
• 作者: Nobuhiko Kuze;et al.;田上公俊;武田哲明
• 通讯作者: 武田哲明

安定成層内の気体混合過程に関する研究

稳定分层气体混合过程研究

• 发表时间: 2009
• 作者: Kimihiko Sugiura;Akitoshi Niwata;Makoto Yamauchi;Kazumi Tanimoto;武田哲明
• 通讯作者: 武田哲明