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Performance prediction of membrane modules incorporating the effects of suction in the mass transfer coefficient under turbulent flow conditions

机译：湍流条件下结合吸力对传质系数影响的膜组件性能预测

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Effects of suction are included in the mass transfer coefficient to predict the performance of spiral wound and tubular modules under the turbulent flow conditions.The analysis is valid for the osmotic pressure controlled filtration.Dextran is selected as the model solute.Variations of bulk concentration,bulk velocity,retentate channel pressure,permeate flux,permeate concentration,etc.,along the module length are obtained after solving the design equations numerically.The results are compared with the standard module design using mass transfer coefficient without including suction and the film theory.The results indicate that without including suction in the mass transfer coefficient leads to gross underprediction of the length averaged permeate flux(about 70-75%)and overprediction of the average permeate of concentration(about 8-10%)for various operating conditions studied herein(for a 10 m long module).On the other hand,calculations using film theory leads to underprediction of average permeate flux in the range of 30-35%.
机译：传质系数中包括吸力的影响，以预测在湍流条件下螺旋缠绕和管状组件的性能。该分析对渗透压控制过滤有效。选择Dextran作为模型溶质。体积浓度的变化，数值求解设计方程后，即可求得模块速度的整体速度，滞留通道压力，渗透通量，渗透浓度等。将结果与传质系数（不包括吸力和膜理论）的标准模块设计进行比较。结果表明，在本文研究的各种操作条件下，不将吸力包括在传质系数中会导致对长度平均渗透通量的总体预测不足（约70-75％），对浓度平均渗透率的预测过高（约8-10％）。 （对于10 m长的模块）。另一方面，使用薄膜理论进行计算会导致对平均数的低估渗透流量在30％至35％之间。

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