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An experimental and theoretical analysis of turbulence promoter assisted ultrafiltration of synthetic fruit juice

机译：湍流促进剂辅助合成果汁超滤的实验和理论分析

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Ultrafiltration of synthetic fruit juice (mixture of pectin and sucrose) is performed in continuous cross flow mode with an organic ultrafiltration membrane (PPE 30, poly phenylene ethersulfone) of 30 K molecular weight cut off. The permeate fluxes are measured under various operating conditions, namely, transmembrane pressure and cross flow velocity. Significant enhancement of permeate flux is achieved by incorporation of cylindrical promoters placed perpendicular to the flow. Image analyzing video microscopy is used to quantify the deposition profile of pectin on the membrane surface. The consistency of these measurements in relation to enhancement of permeate flux are examined. The coupled fluid flow and mass transfer processes including the effects of the promoters are modeled and solved using FLUENT. The geometry of the system is constructed using GAMBIT and special attentions are given to mesh sizes in the different zones of flow, e.g., finer mesh is used near the membrane surface. The calculated values of permeate flux under various operating conditions agree well with the experimental data.
机译：合成果汁（果胶和蔗糖的混合物）的超滤是在连续错流模式下进行的，其中截留分子量为30 K的有机超滤膜（PPE 30，聚苯醚砜）。在各种操作条件下，即跨膜压力和错流速度下测量渗透通量。通过结合垂直于流动方向放置的圆柱形促进剂，可以显着提高渗透通量。图像分析视频显微镜用于量化果胶在膜表面上的沉积情况。检查了这些测量值与渗透通量增加之间的一致性。使用FLUENT对耦合的流体流动和传质过程（包括促进剂的作用）进行建模和求解。使用GAMBIT构建系统的几何结构，并特别注意不同流动区域中的网格尺寸，例如，在膜表面附近使用更细的网格。在各种工况下的渗透通量计算值与实验数据吻合良好。

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