大尺寸仿猪笼草口缘区结构半圆管形微流道设计

Design of large-scale semi-circular tube flow microchannel imitating peristome structure of nepenthes alata

针对面向无动力输入的自由流体在半圆形截面微流道中单向流动的问题,设计并制备了具有百微米级大尺寸仿猪笼草口缘区结构的开放式半圆管型微流道。分析液体单向铺展性机理,设计基本的大尺寸仿猪笼草口缘区结构半圆管表面;使用光固化成型方法的数字光处理3D打印设备制备工件,实验分析大尺寸仿猪笼草口缘区结构半圆管型微流道的液体单向铺展性,计算极差表征各结构参数对单向铺展性的影响。结果表明:大尺寸仿猪笼草口缘区结构半圆管型微流道在椭圆半长轴570μm,空腔楔角30°,微流道宽度320μm,结构体长360μm,拉伸长度200μm,曲率2时具有较强的单向铺展性;各因素对铺展系数的影响程度由大到小分别为拉伸长度、结构体长、空腔楔角、椭圆半长轴、微流道宽度和曲率。研究结果为大尺寸仿猪笼草口缘区结构半圆管型微流道的参数设计提供基础指导,也验证了采用常规3D打印技术制备具有单向铺展性的微流道的可行性。

Addressing the challenge of uni-directional fluid flow without power input in a semi-circular tubular microchannel,a large-scale model inspired by the Nepenthes alata peristome was designed and fabricated,with a scale of 100μm.The mechanism behind the uni-directional liquid spreading was examined,leading to the design of a semi-circular tube structure featuring the Nepenthes alata peristome surface.A digital light processing 3D printer using a photocuring method was employed to create the workpiece.Experimental studies were conducted to observe the uni-directional spreading of liquid within this large-scale semi-circular tubular microchannel.By calculating the range,various structural parameters'influence on the liquid's uni-directional spreading performance was quantified.Results indicate that the semi-circular tubular microchannel,characterized by factors such as the ellipse's semi-major axis of 570μm,microcavity wedge of 30°,microchannel width of 320μm,structural length of 360μm,stretching length of 200μm,and curvature of 2,showed superior uni-directional spreading performance.The influence of each factor on the spreading coefficient,ranked from smallest to largest,was stretching length,structure length,microcavity wedge,semi-major axis of the ellipse,microchannel width,and curvature.These findings offer essential guidance for the design parameters of large-size semi-circular tubular microchannels with a Nepenthes alata peristome structure and also confirm the feasibility of using conventional 3D printing technology to create microchannels with uni-directional fluid spreading.