Research On The Fluid Diode Induced By Wettability Gradient And Its Water Collection Effect

More and more machining precisions are achieved at micro/nano scale with the continuous development of machinery manufacturing,Ultrafast laser micro/nano processing technology is an advanced processing method with ultra-high instantaneous power,high machining accuracy,and minimal thermal impact on materials,and it has gained wide attention in the field of material processing.The combination of the bionic concept and the ultra-fast laser micro/nano processing technology has been successfully applied to many research fields,such as the manipulation of droplet,water collection,anti-icing,self-cleaning.This article aims at the problem of water shortage in the world,inspired by the unidirectional liquid transport on the porous lotus leaf with asymmetric wettability,the rotational fog collector has been prepared.The fog collector can achieve the efficiently and continuously fog collection in the rotational and low evaporation rate mode.The fog collection device is assembled by the closed fog collection cylinder with asymmetric wettability and the winddriven revolving component.The efficiency of the rotational fog collector is further improved by optimizing the design of the micro-pore size and pitch.Based on the actual size of the fog collector,the dynamic model of the fog collector in the wind was established.The relationship between the wind speed and the rotation speed of the fog collector was explored by simulating the rotation of the fog collector in different wind field.At the same time,the fog collection efficiency of the fog collector with different rotation speed was also measured.And the influence of the wind speed on the fog collection efficiency of the rotational collector was evaluated.We demonstrate that the rotational collector can be used to realize efficient fog collection and low water evaporation storage in wind-driven mode.It is verified that the fog collection efficiency of the rotational fog collector can be increased by 49% compared with the static fog collector in the wind field with the wind speed of 1 m/s.This work opens up an avenue for designing a novel fog collector used in real environment and provides a novel optimization strategy of dynamic fog collection for improving the fog collection efficiency of the existing fog collectors.