用于多孔介质研究的透明3D打印流动池及两相流反向不对称性的概念验证
Transparent 3D-printed flow cells for porous media studies with proof-of-concept on two-phase flow-reversal asymmetry
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中文总结 AI 辅助
本文提出一种可复现的开源3D打印透明流动池制造规程，并验证其在两相流反向不对称性研究中的应用，连接孔隙几何与宏观响应。
中文摘要 AI 辅助
多孔介质实验通常依赖于几何控制和光学透明的实验流动池。例子包括流动结构、溶质混合、多相流、细菌动力学和反应输运的研究。在这里，我们提供了一个可重复且开源的操作规程，通过立体光刻3D打印制造透明的单片多孔流动池。该规程涵盖数字设计、树脂打印、内部冲洗和树脂涂层。冲洗和涂层步骤是工作流程的核心，使得封闭的单材料池能够清除未固化树脂，并变得光学透明以进行直接成像。该规程生产出光学透明、毫米级、准二维的流动池，适用于同时进行压力和基于图像的测量。作为概念验证，我们研究了在包含三角形或圆柱形障碍物的准二维Hele-Shaw池中，稳态油-空气两相流中的流动反向不对称性。方向差异通过压力测量和基于图像的有效宽度测量进行量化。三角形几何产生明显的方向响应，而圆柱形几何在实验不确定性范围内保持对称。这些结果表明，我们的制造规程可以将数字设计的孔隙几何与宏观压力响应和稳态两相流组织联系起来。通过公开设计文件、脚本和制造工作流程，我们旨在使3D打印流动池易于适应其他实验系统和研究领域。
英文摘要
Porous media experiments commonly rely on geometry-controlled and optically transparent experimental flow cells. Examples include studies of flow structure, solute mixing, multiphase flow, bacterial dynamics, and reactive transport. Here, we provide a reproducible and open-source protocol to fabricate transparent monolithic porous flow cells by stereolithography 3D printing. The protocol covers digital design, resin printing, internal flushing, and resin coating. The flushing and coating steps are central to the workflow, enabling enclosed single-material cells to be cleared of uncured resin and made optically transparent for direct imaging. The protocol produces optically transparent, millimetre-scale, and quasi-two-dimensional flow cells suitable for simultaneous pressure and image-based measurements. As a proof of concept, we study flow-reversal asymmetry in steady oil-air two-phase flow in quasi-two-dimensional Hele-Shaw cells containing either triangular or cylindrical obstacles. Directional differences are quantified from pressure measurements and from image-based active-width measurements. The triangular geometry produces a clear directional response, whereas the cylindrical geometry remains symmetric within experimental uncertainty. These results demonstrate that our fabrication protocol can link digitally designed pore geometries to macroscopic pressure response and steady-state two-phase flow organisation. By making the design files, scripts, and manufacturing workflow openly available, we aim to make 3D-printed flow cells readily adaptable to other experimental systems and research fields.
发表机构
- Norwegian University of Science and Technology (NTNU)（挪威科技大学）
- University of Oslo（奥斯陆大学）
- University of Cambridge（剑桥大学）
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