Pictures of an experiment on Migration of hydrogen and carbon dioxide in a Hele-Shaw cell

The injection of hydrogen/carbon dioxide was done using a mass flow controller on the bottom right inlet at a rate of 0.1 mL per minute. The pressure at the top of the cell was maintained at 1 atmospheric pressure using the two outlets on top of the cell. Pressure sensors were connected to the inlets, outlets, and both sides of the cell, to measure the pressure against time.  This experiment was conducted under the same conditions for the injection of both carbon dioxide and hydrogen.<br>For the first experiment, carbon dioxide was consistently injected at a rate of 0.1ml/min for 7 hours and 24 minutes. Due to time constraints hydrogen was injected over 2 days, for 2 hours and 33 minutes on the first day and 6 hours and 53 minutes on the second day for a total injection time of 9 hours and 26 minutes, at the same rate of injection. In between experiments, the cell was flushed for 5 days to displace all of the residual carbon dioxide, and allow most of the remaining gas to dissolve in the water and flushed out with more water.<br>The carbon dioxide experiment was conducted without interuptions, the hydrogen was done from 14h24 to 16h57 on the first day and 09h33 to 16h26.The time indicatedon the pictures is around 33 minutes early<br><br><br><br>

氢气与二氧化碳的注入均采用质量流量控制器（mass flow controller），通过池体右下角的入口进行，注入流速设定为每分钟0.1 mL。通过池体顶部的两个出口，将池体顶部压力维持为1个标准大气压。压力传感器（pressure sensors）连接至各入口、出口及池体两侧，用于采集压力随时间的变化数据。本实验中二氧化碳与氢气的注入条件保持一致。
首次实验中，二氧化碳以0.1 mL/min的流速持续注入7小时24分钟。受实验时长限制，氢气的注入分两日完成：首日注入2小时33分钟，次日注入6小时53分钟，总注入时长为9小时26分钟，注入流速与二氧化碳保持一致。两次实验间隔期间，对池体开展为期5天的冲洗作业：先排出全部残留的二氧化碳，再通过持续通入清水将大部分剩余气体溶解并带出池体。
二氧化碳注入实验全程未发生中断；氢气的注入时段为首日14时24分至16时57分，以及次日09时33分至16时26分。图片标注的时间较实际时间早约33分钟。