发表机构
Western Norway University of Applied Sciences; University of Stuttgart（西挪威应用科学大学; 斯图加特大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出一种耦合拉格朗日气泡追踪的动态孔隙网络模型，模拟PEM电解槽中微气泡输运，发现增大表观重力通过减小脱离半径促进离散气泡输运。
AI 中文摘要
我们开发了一种混合孔隙网络模型（PNM），用于模拟多孔介质中离散微气泡输运与连通两相流的耦合过程。我们将该模型应用于旋转质子交换膜（PEM）电解槽的多孔输运层中的流动模拟。在足够大的表观重力作用下，在催化剂层生成的气泡可以在小于特征孔隙尺寸的尺寸下脱离，并通过浮力和平流在充满液体的孔隙中移动。该模型将动态两相PNM与拉格朗日气泡追踪器耦合。方形喉道中的孔隙尺度斯托克斯模拟提供了气泡浮力速度、含气泡喉道的水力阻力以及液体流动与气泡运动之间相互耦合的闭合关系。验证测试评估了守恒性、压力-流量耦合、气泡生长、平流、合并、捕集以及向连通气相转移的过程。网络模拟表明，增加表观重力作用会使更大比例的产气转向离散气泡输运。这种增加主要源于脱离半径的减小，这减小了气泡尺寸，使其能够更自由地在网络中移动。
英文摘要
We develop a hybrid pore-network model (PNM) for discrete microbubble transport coupled to connected two-phase flow in porous media. We apply the model to simulate flow in the porous transport layer of a rotating proton exchange membrane (PEM) electrolyser. At sufficiently large apparent gravitational forces, bubbles growing at the catalyst layer can detach at sizes smaller than the characteristic pore size and move through liquid-filled pores via buoyancy and advection. The model couples a dynamic two-phase PNM to a Lagrangian bubble tracker. Pore-scale Stokes simulations in square throats provide closures for the bubble buoyancy velocity, the hydraulic resistance of bubble-occupied throats, and the reciprocal coupling between liquid flow and bubble motion. Verification tests assess conservation, pressure-flow coupling, bubble growth, advection, merging, trapping, and transfer to the connected gas phase. The network simulations show that increasing apparent gravitational forces shifts a larger fraction of the produced gas toward discrete-bubble transport. The increase mostly comes from a reduced detachment radius, which decreases bubble size and lets them move more freely through the network.
Comments32 pages (+11 in supplementary) and 20 figures (+18 in supplementary)
