充てん層内流動と空隙構造の相関:第1報, MRIによる軸方向流速分布の計測と軸方向チャンネル流の可視化

概要

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Structure and velocity measurements using magnetic resonance imaging(MRI)have been performed experimentally to obtain a correlation between pore structure and interstitial flow through the packed bed of 5mm diameter in the tube of 36mm ID. To measure axial velocity maps of water flow through the packed bed, the phase method of using the phase difference of water spin magnetization between flowing and atagnant fluids by applying magnetic fields with bipolar gradients was employed. The spatial resolution of the obtained map in 0.2mm×0.2mm×0.5mm. It was made clear from the obtained axial velocity maps that channel flows with higher axial velocity were induced not only near the wall but also in the internal region of the packed bed. Furthermore, pore structure of the packed bed was characterized from multi-slice images by partitioning of void space and combining of each pore section along the axial direction to analyze the structure-flow correlation. It was found from image analysis that axial channels with long and straight void space existed in the pore structure, and that most of the channel flows with higher axial velocity were induced in the axial channels. The flow rate through an axial channel depends on the square of the averaged cross section of the axial channel.
一般社団法人日本機械学会の論文
2000-02-25