直通道仿生微流控芯片中微塑料颗粒分离特性研究OA

To optimize an efficient biomimetic microfluidic chip for the high-efficiency,high-throughput separa-tion of micron-sized particles such as microplastics,a computational fluid dynamic(CFD)coupled with dis-crete 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 parti-cle 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.Final-ly,based on the mechanism analysis,the chip structure was optimized by increasing the cross-sectional length of the auxiliary channel,to achieve a maximum improvement of 7.9％in particle separation efficiency,an aver-age 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.