Membrane separations for fruit juice processing have been largely investigated, but membrane fouling is still a limitation to be overcome. Here, the use of turbulence promoters to increase the permeate flux of purple araça fruit (Psidium myrtoides) extract through flat polymeric membranes was investigated. The turbulence promoters were produced using 3D printing technology with two different cylindrical pin diameters (2.5 and 3.5 cm). Results show that the ultrafiltration membrane was efficient to concentrate the bioactive compounds of purple araça fruit extract. Retentions of total polyphenol and flavonoid compounds were 95 % and 90 %, respectively. The use of turbulence promoters increased the permeate flux by up to 78 %. According to computational fluid dynamics (CFD), the turbulence promoters with diameters of 2.5 and 3.5 mm increased the flow velocity on the membrane surface in 38.4 % and 30.7 %, respectively, and increases in turbulence intensity were of 69.0 % and 43.2 %, respectively. In addition, the turbulence promoters with diameters of 2.5 and 3.5 mm increased the wall shear stress from 1.57 to 3.12 and 3.07 Pa, respectively. Thus, the turbulence promoters had positive effects on hydrodynamics during ultrafiltration of purple araça fruit extract.

果汁加工中的膜分离已经得到了广泛的研究，但是膜污染仍然是要克服的局限性。在这里，使用湍流促进剂来增加紫色阿拉萨果（Pydium myrtotoides）的渗透通量研究了通过扁平聚合物膜的萃取物。湍流促进剂是使用3D打印技术生产的，具有两种不同的圆柱销直径（2.5和3.5 cm）。结果表明，超滤膜可有效浓缩紫罗兰果提取物的生物活性化合物。总多酚和类黄酮化合物的保留率分别为95％和90％。湍流促进剂的使用使渗透通量增加了高达78％。根据计算流体动力学（CFD），直径为2.5和3.5 mm的湍流促进剂分别使膜表面的流速增加了38.4％和30.7％，湍流强度的增加分别为69.0％和43.2％ 。此外，直径为2.5和3的湍流促进器。5 mm的壁切应力分别从1.57 Pa增加到3.12 Pa和3.07 Pa。因此，湍流促进剂对紫色花生果提取物的超滤过程中的流体动力学有积极影响。