Ceramic microsieves: influence of perforation shape and distribution on flow resistance and membrane strength |
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| Institution: | 1. School of Mechanical & Aerospace Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Key Laboratory for Power Machinery and Engineering of MOE, Shanghai Jiao Tong University, Shanghai 200240, China;3. School of Energy & Power Engineering, Jiangsu University of Science and Technology, Zhenjiang City, Mengxi Road 2, Jiangsu Province 212003, China;1. Inst. Phys. Chem., TU-Bergakademie Freiberg, Leipziger Str. 29, 09596 Freiberg, Germany;2. IKGB, TU-Bergakademie Freiberg, Leipziger Str. 28, 09596 Freiberg, Germany;1. Laboratory of Inorganic Materials, Chemical Process and Energy Resources Institute, Center for Research and Technology-Hellas, 57001 Thessaloniki, Greece;2. Laboratory of Materials Technology, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece |
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| Abstract: | Ceramic microsieves with slit-shaped perforations were compared to sieves with circular-shaped perforations, regarding flow resistance and membrane strength. Destructive tests show that the highest strength is obtained if the perforations are placed in a non-alternating pattern. Especially for slits, alternating patterns should be avoided as they make the structure unnecessarily flexible. The highest stress occurs at the edges of the membrane where it is attached to the support. Flexible structures bend stronger and therefore cause a higher stress at the edge, resulting in an easier rupture of the membrane. Our results show that ceramic microsieves with slits show a four to five-fold decrease in flow resistance for comparable strength related to sieves with circular pores. |
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