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An Improved Method for Calculating Stress Intensity Factors at Free Surfaces of Typical Cracks in Ultra-High-Pressure Vessels
Original title: 超高压容器典型裂纹自由表面处应力强度因子的计算方法改进
Summary
Researchers designed and optimized a biomimetic microfluidic chip using computational fluid dynamics and discrete element modeling, achieving up to 7.9% improvement in micron-scale particle separation efficiency through structural modifications to auxiliary channels. This advances microplastic pollution research by providing a high-throughput filtration tool capable of efficiently separating microplastic-sized particles from water streams.
To optimize an efficient biomimetic microfluidic chip for the highefficiency, highthroughput separation of micronsized particles such as microplastics, a computational fluid dynamic (CFD) coupled with discrete element method (DEM) numerical approach was employed to systematically investigate the internal flow field and particle separation mechanisms of a biomimetic microfluidic filtration structure. The 4 interesting particle separation mechanisms were summarized: at low Reynolds numbers, particles are separated through inertial focusing effects; at high Reynolds numbers, particles rely on the capture effect of vortices at the leading edge of the valve and the backflow effect between valves at the channel end to form 3 separation mechanisms. Finally, based on the mechanism analysis, the chip structure was optimized by increasing the crosssectional length of the auxiliary channel, to achieve a maximum improvement of 7.9% in particle separation efficiency, an average reduction of 7.2% in the main channel flow rate, and a maximum increase of 9.4% in the production of clean filtrate. These findings provide a theoretical support for the optimized design of efficient bionic filtration membranes.