Large droplets emerging during dropwise condensation impair surface properties such as anti-fogging/frosting ability and heat transfer efficiency. How to spontaneously detach massive randomly distributed with controlled sizes has remained a challenge. Herein, we present solution called droplet sieve, through fabricating microscale thin-walled lattice structures coated superhydrophobic layer. Growing were observed jump off this once becoming slightly larger than the lattices. The maximum...

The conventional coalescence-induced jumping of droplets has been extensively studied, but the energy conversion efficiency droplet is low and direction uncontrollable, which greatly limits application jumping. In this work, we report an enhanced guided self-propelled on a superhydrophobic surface with macrotexture analyze mechanism enhancement guidance. interaction between liquid bridge changes enhances efficiency. can be controlled at about 45°, increased by 2.7 times.

With the development of superhydrophobic surface preparation technology, coalescence-induced droplet jumping shows broad application prospects in fields enhanced condensation heat transfer and self-cleaning. In this work, process heterogeneous homogeneous droplets on superamphiphobic surfaces was studied by using glycerol–water mixtures with different glycerol volume fractions. The results showed that tension gradient will lead to asymmetric deformation droplets, distribution internal...

Gallium-based liquid metal is a new class of material that has attracted extensive attention due to its excellent deformation characteristics and great potential in applications. Based on the droplets, researchers have developed many oscillation systems composed gallium indium tin alloy (GaInSn) droplet graphite, or aluminum-doped (Al-GaIn24.5) iron, so on. Rather than oxidation deoxidation mechanisms used previous systems, an system can achieve (EGaIn) with frequency 0–29 Hz designed...

The transportation and control of microfluidics have an important influence on the fields biology, chemistry, medicine. Pump systems based electrocapillary effect room-temperature liquid metal droplets attracted extensive attention. Flow rate is parameter that reflects delivery performance pump systems. In previous studies, cylindrical structures are mostly used to constrain droplet. analysis quantitative description voltage frequency, alternating voltage, direct current bias, solution...

Droplet impact and droplet coalescence are two very common phenomena. When these processes occur on a superhydrophobic surface in an appropriate sequence, interesting but little-noticed phenomenon will with rotation of the rebounding-coalescing droplet. impacts another stationary velocity position, reaction force produced by moment arm formed liquid bridge produces reversed torque. This reverse torque causes to rotate after rebounding. The early stage process is key rotation, relative...

Coalescence-induced droplet jumping on superhydrophobic surfaces has good application potential in the fields of heat transfer enhancement, self-cleaning, water collection, and microfluidics. However, direction droplets plane is uncontrollable energy conversion rate low, which limits jumping. In this work, we report a flexible approach to efficiently regulate velocity using string. By changing inclination angle string, coalescent shows maximum deviation 68.1° from surface normal. The 32.1%,...

The jumping direction is an essential characteristic of droplets, but it poorly understood and uncontrollable at present. In this work, we present a method to control the by surface structures, where controlled changing inclination angle structure. underlying mechanism analyzed experimentally, with numerical simulations, using theoretical model developed relate for few cases specific distribution. Because random droplet distributions are more common on actual condensation surfaces,...

The essential characteristic of the self-propelled jumping droplet is velocity, which determines its application value in heat transfer enhancement, antifrosting, self-cleaning, and so on. velocity directly related to energy conversion efficiency (i.e., ratio kinetic surface released by coalescence coalescence) it affected initial state droplets but there no unified theory describe relationship between efficiency. In this paper, projection chemical potential final difference direction...

The coalescence-induced droplet jumping on superhydrophobic surfaces has extensive application potential in water harvesting, thermal management of electronic devices, and microfluidics. rational design the surface structure can influence interaction between surface, thereby controlling velocity direction droplet's jumping. In this study, we fabricate with annular wedge-shaped micropillar arrays, examine dynamic behavior condensate droplets measure temporal spatial variations density,...

Coalescence-induced droplet jumping on superhydrophobic surfaces has significant potential for various applications, such as enhanced condensation, water harvesting, self-cleaning, and thermal management of electronic devices. Existing research focuses primarily the coalescence two or more droplets horizontally placed surface, but transport behavior condensate caused by coalescence-induced inclined surface is insufficiently understood. In this work, we investigate impact inclination angle...

The energy conversion efficiency (the ratio of the maximum jumping kinetic to surface released from droplet coalescence) is an essential indicator self-propelled droplets, which determines its value for applications in various fields. In practical condensation process, initial states multidroplets with different sizes and distributions have a significant effect on efficiency, but mechanism behind this remains unclear. This paper reveals droplets multidroplet (mainly three droplets)...

This Rapid Communication presents the self-propelled and controllable motion of liquid metal droplets, which is driven by surface tension does not depend on any external force field. Its speed direction can be controlled just as a projectile fired slingshot: The droplet projectile, substrate serves bowstring. provides potential mechanism for application metals in soft robotics, drug delivery, chip cooling, other fields.Received 11 March 2020Accepted 16 October...

Coalescence-induced droplet jumping holds great potential for applications such as water harvesting, self-cleaning, and the thermal management of electronic devices. This study investigates impact droplet's initial position on coalescence-induced superhydrophobic surfaces with micropillar arrays. Numerical simulations are conducted to examine differences in at various positions uniform nonuniform distributions, effects its velocity pressure distribution analyzed. The findings indicate that...