Underground Hydrogen Storage (UHS) is an attractive technology for large-scale (TWh) renewable energy storage. To ensure the safety and efficiency of the UHS, it is crucial to quantify the H${}_2$ interactions with the reservoir fluids and rocks across scales, including the micro scale. This paper reports the experimental measurements of advancing and receding contact angles for different channel widths for a H₂/water system at P = 10 bar and T = 20 °C using a microfluidic chip. To analyse the characteristics of the H₂ flow in straight pore throats, the network is designed such that it holds several straight channels. More specifically, the width of the microchannels range between 50 $\mathrm{\mu }$m and 130 $\mathrm{\mu }$m. For the drainage experiments, H₂ is injected into a fully water saturated system, while for the imbibition tests, water is injected into a fully H₂-saturated system. For both scenarios, high-resolution images are captured starting the introduction of the new phase into the system, allowing for fully-dynamic transport analyses. For better insights, N₂/water and CO₂/water flows were also analysed and compared with H₂/water. Results indicate strong water-wet conditions with H${}_2$/water advancing and receding contact angles of, respectively, 13°–39°, and 6°–23°. It was found that the contact angles decrease with increasing channel widths. The receding contact angle measured in the 50 $\mathrm{\mu }$m channel agrees well with the results presented in the literature by conducting a core-flood test for a sandstone rock. Furthermore, the N₂/water and CO₂/water systems showed similar characteristics as the H${}_2$/water system. In addition to the important characterization of the dynamic wettability, the results are also crucially important for accurate construction of pore-scale simulators.

地下储氢 (UHS) 是一项极具吸引力的大规模 (TWh) 可再生能源储存技术。为确保 UHS 的安全性和效率，量化 H${}_2$与储层流体和岩石的跨尺度相互作用，包括微观尺度。本文报告了使用微流控芯片在 P = 10 bar 和 T = 20 °C 下对 H _{2 /水系统的不同通道宽度的前进和后退接触角的实验测量。}为了分析直孔喉中 H ₂流动的特征，网络被设计成具有多个直通道。更具体地说，微通道的宽度在 50$\mathrm{\mu }$米和130$\mathrm{\mu }$米。对于排水实验，H ₂被注入完全水饱和的系统中，而对于渗吸试验，水被注入完全H ₂饱和的系统中。对于这两种情况，在将新阶段引入系统时都会捕获高分辨率图像，从而进行全动态传输分析。为了更好地了解，还分析了 N ₂ /water 和 CO ₂ /water 流量，并与 H ₂ /water 进行了比较。结果表明 H 的强水湿条件${}_2$/水前进和后退接触角分别为13°–39°和6°–23°。发现接触角随着通道宽度的增加而减小。在 50 度测量的后退接触角$\mathrm{\mu }$通过对砂岩岩石进行岩心驱替试验，m 通道与文献中提出的结果非常吻合。此外，N ₂ /water 和 CO ₂ /water 系统表现出与 H 相似的特征。${}_2$/水系统。除了动态润湿性的重要表征外，结果对于精确构建孔隙尺度模拟器也至关重要。