東京工業大学 · 工学
本研究室では、多孔質媒体内における液体・気体の移動と反応挙動を、X線マイクロCTを用いた高解像度観察とマイクロモデルを組み合わせて解明しています。特に、ガスの溶解挙動（CO2を含む）、蒸発・析出プロセス、界面不安定性（溶解フィンガリング）のメカニズムに注力しており、炭素隔離（GCS）や土壌修復、地下水分循環の理解に貢献しています。実験的・数値的・理論的アプローチを統合した多スケールな研究が特徴です。
Figures are computed from collected data and may differ slightly.
Abstract Dissolution mass transfer from the trapped phase to the flowing phase in porous media occurs in various hydrogeology processes. One of the important phenomena is dissolution fingering and its effect on dissolution mass transfer. In this work, dissolution mass transfer in porous media with various particle sizes and distribution was investigated in pore scale and meso‐scale by using X‐ray microcomputed tomography. The specific interfacial area and mass transfer coefficient were measured
Micromodels are important for studying various pore-scale phenomena in hydrogeology. However, the fabrication of a custom micromodel involves complicated steps with cost-prohibitive equipment. The direct fabrication of micromodels with a 3D printer can accelerate the fabrication steps and reduce the cost. A stereolithography (SLA) 3D printer is one of the best options because it has sufficient printing performance for micromodel fabrication and is relatively inexpensive. However, it is not witho
When viscosity and density contrast exist in the vertical miscible displacement in porous media between two fluids, the interplay between the viscous force and gravity determines the interface stability. Two stability criteria are derived to determine the interface stability. Hill's and Dumore's stability criteria are used to determine the interface stability of the sharp and diffused interface, respectively. In this study, we visualized the crossover between unstable displacement and stable dis
多孔質内にトラップされているガスの流動している水相への溶解は二酸化炭素地下貯留（GCS）などの様々な水理学的分野において重要な過程である。GCS では，CO2 の溶解により，貯留層圧力変化や浮力によるリークリスクの低減につながるため溶解速度は安全性評価において重要な観点になる。本研究ではCO2, O2, N2, と Ar の４種のガスの多孔質中での溶解プロセスの違いを比較検討した。CO2 は他のガスに比べて極めて特徴的な溶解挙動を示すことを見出した。CO2 は他のガスに比べて溶解度が一桁程度大きいため，初期の溶解が非常に速く，トラップされたCO2 気 泡の周りに飽和水の膜が形成される。この飽和膜の存在がCO2 の物質輸送係数を低下させていると考えられる。
Abstract Using a combination of a porous plate, micro-computed tomography, and differential imaging, the differential imaging porous plate (DIPP) method was employed to monitor spatial fluid distribution and measure capillary pressure between oil and water in an oolitic limestone, Ketton. Based on geological interpretation, mercury intrusion capillary pressure (MICP), and scanning electron microscopy (SEM), the pores were classified into macropores, intermediate-size pores, and micropores. Macro
Understanding salt precipitation during brine evaporation in porous media is crucial for applications such as CO₂ storage, soil remediation, and industrial drying. While previous studies have primarily focused on displacement and evaporation, our research specifically investigates the evaporation process by employing a trapped brine condition to examine the interplay between evaporation, advection, and diffusion during brine drying in homogeneous porous media. Using X-ray microtomography, we vis
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