Experimental Investigation And Numerical Simulation Of Filtration Characteristics Of Inorganic Membranes

In this paper, taking tap water and pineapple juice as material, we studied inorganic Ni membranes' characteristics of flux, separation efficiency and attenuation coefficient of flux under the condition of connecting membrane technology with cross-flow filtration. In addition, we applied membrane technology to clarify pineapple juice and analyzed the granularity of pineapple juice, then, we analyzed the effect of pressure, rotor speed and other parameters on flux and filtration resistance. Meanwhile, we determined the attribution of filtration resistance. Through analyzing the mechanism of filtration, we got the result of the relation of polluted layer resistance with parameters.The results indicated that flux declined followed by time and that the trend can be divided into initial phase and steady phase. Flux decreased quickly in initial phase and descended slowly in steady phase. Accretion of rotate speed of impeller and operation pressure results to the increase of flux in the condition that other operation parameters don't change. In the process of membrane filtration, the resistance of sediment layer accounts for the largest proportion, and the resistance of jammed membrane holes and the increased resistance of membrane hold the larger proportion. The resistance of membrane has a certain proportion in the overall resistance and can not be neglected. The resistance of sediment layer, the resistance of jammed membrane holes and the increased resistance of membrane increase followed by accretion of operation pressure when other operation condition don't change.As a three-dimensional problem, we simulated filtration characteristics of inorganic Ni membranes with laminar Model and porous medium Model in Fluent. The results showed that simulative results are in agreement with experimental data in initial phase, in steady phase, huge difference of flux is found between simulative results and experimental data. It was because simulation process ignored the pollution of membrane, so simulation of flux was bigger than experimental data.