Du Jianzhou, Xiao Xin, Ai Duomei, Liu Jingjin, Qiu Long, Chen Yuansheng, Zhu Kongjun, Wang Luming
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Membranes (Basel). 2022 Mar 31;12(4):390. doi: 10.3390/membranes12040390.
The single-channel AlO-based porous ceramic membrane tubes (PCMT) were prepared with different grain size of AlO powders by extrusion molding process, combing the traditional solid-phase sintering method. The effects of raw grain size and sintering temperature on the microstructure, phase structure, density, and porosity were investigated. The results revealed that with further increase in sintering temperature, the density of porous ceramics increases, while the porosity decreases, and the pore size decreases slightly. The pore size and porosity of porous ceramics increase with the increase in raw grain size, while the density decreases. Future, in order to study the water filtration of PCMT, the effect of porosity on the pressure distribution and flow velocity different cross-sectional areas with constant feed mass flow was analyzed using Fluent 19.0. It was found that an increase in the porosity from 30% to 45% with constant feed mass flow influenced transmembrane pressure, that varied from 216.06 kPa to 42.28 kPa, while the velocity change at the outlet was not obvious. Besides, it was observed that the surface pressure is almost constant along the radial direction of the pipe, and the velocity of water in the PCMT is increasing with the decreasing of distance to the outlet. It was also verified that the porosity being 39.64%, caused transmembrane pressure reaching to 77.83 kPa and maximum velocity of 2.301 m/s. These simulation and experimental results showed that the PCMT have good potential for water filtration.
采用挤压成型工艺，结合传统的固相烧结法，用不同粒度的氧化铝粉末制备了单通道氧化铝基多孔陶瓷膜管（PCMT）。研究了原始粒度和烧结温度对微观结构、相结构、密度和孔隙率的影响。结果表明，随着烧结温度的进一步升高，多孔陶瓷的密度增加，孔隙率降低，孔径略有减小。多孔陶瓷的孔径和孔隙率随原始粒度的增加而增加，而密度降低。接下来，为了研究PCMT的水过滤性能，使用Fluent 19.0分析了在恒定进料质量流量下孔隙率对不同横截面积上压力分布和流速的影响。发现在恒定进料质量流量下，孔隙率从30%增加到45%会影响跨膜压力，跨膜压力从216.06 kPa变化到42.28 kPa，而出口处的速度变化不明显。此外，观察到沿管道径向表面压力几乎恒定，并且PCMT中水流速度随着距出口距离的减小而增加。还验证了孔隙率为39.64%时，跨膜压力达到77.83 kPa，最大速度为2.301 m/s。这些模拟和实验结果表明，PCMT在水过滤方面具有良好的潜力。
