Design of large-scale semi-circular tube flow microchannel imitating peristome structure of nepenthes alata
Addressing the challenge of uni-directional fluid flow without power input in a semi-circular tu-bular microchannel,a large-scale model inspired by the Nepenthes alata peristome was designed and fabri-cated,with a scale of 100 μm.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.Ex-perimental 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 tu-bular microchannel,characterized by factors such as the ellipse's semi-major axis of 570 μm,microcavity wedge of 30°,microchannel width of 320 μm,structural length of 360 μm,stretching length of 200 μm,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,micro-cavity wedge,semi-major axis of the ellipse,microchannel width,and curvature.These findings offer es-sential guidance for the design parameters of large-size semi-circular tubular microchannels with a Nepen-thes alata peristome structure and also confirm the feasibility of using conventional 3D printing technology to create microchannels with uni-directional fluid spreading.
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