Abstract Round hollow fiber membranes have been well established in applications such as gas separation, ultrafiltration and blood dialysis. Yet, it is well known that geometrical topologies can introduce secondary flow patterns counteracting mass transport limitations, stemming from diffusion resistances and fouling. We present a new systematic methodology to fabricate novel membrane architectures. We use the freedom of design by 3D-printing spinnerets, having multiple bore channels of any geometry. First, such spinnerets are stationary to fabricate straight bore channels inside a monolithic membrane. Second, in an even more complex design, a new mechanical system enables rotating the spinneret. Such rotating multibore spinnerets enable (A) the preparation of twisted channels inside a porous monolithic membrane as well as (B) a helical twist of the outside geometry. The spun material systems comprise classical polymer solutions as well as metal-polymer slurries resulting in solid porous metallic monolithic membrane after thermal post-processing. It is known that twisted spiral-type bore channel geometries are potentially superior to straight channels with respect to mass and heat polarization phenomena, however their fabrication was cumbersome in the past. Now, the described methodology enables membrane fabrication to tailor the membrane geometry to the needs of the membrane process. To showcase the delicate interplay between the geometry and radial and axial flow conditions, we report fluid mechanical simulations and flow magnetic resonance imaging measurements for a twisted tri-bore membrane during permeation.

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3D 打印的旋转喷丝板可产生扭曲的膜

摘要 圆形中空纤维膜已广泛应用于气体分离、超滤和血液透析等领域。然而，众所周知，几何拓扑结构可以引入二次流动模式，抵消由扩散阻力和污垢引起的质量传输限制。我们提出了一种新的系统方法来制造新型膜结构。我们通过 3D 打印喷丝板使用设计的自由度，具有任何几何形状的多个孔道。首先，这种喷丝头是固定的，以在单片膜内制造直孔通道。其次，在更复杂的设计中，新的机械系统可以旋转喷丝板。这种旋转的多孔喷丝头能够 (A) 在多孔单片膜内制备扭曲通道以及 (B) 外部几何形状的螺旋扭曲。纺丝材料系统包括经典的聚合物溶液以及金属聚合物浆料，在热后处理后形成固体多孔金属单片膜。众所周知，就质量和热极化现象而言，扭曲的螺旋型孔道几何形状可能优于直通道，但它们的制造在过去很麻烦。现在，所描述的方法使膜制造能够根据膜工艺的需要定制膜几何形状。为了展示几何形状与径向和轴向流动条件之间的微妙相互作用，