Method for controlling droplet impact form, contact time and droplet controllable splitting

A contact time and liquid control technology, applied in the field of droplet collision, can solve the problems of not being able to control the droplet impact shape and post-collision behavior at will, and achieve the effects of low cost, good effect and easy preparation.

Active Publication Date: 2020-08-14
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not yet possible to control the droplet's impact morphology, post-impact behavior, and the associated impact dynamics at will.

Method used

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  • Method for controlling droplet impact form, contact time and droplet controllable splitting
  • Method for controlling droplet impact form, contact time and droplet controllable splitting
  • Method for controlling droplet impact form, contact time and droplet controllable splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The method for controlling droplet impact form in the present embodiment comprises the following steps:

[0033] (1) Template design: Firstly, the template of 1-4 ball obstacles is designed by 123Ddesign software. The template is a 3*3 cm square and a flat plate with a thickness of 3 mm. The radius of the obstacle ball is 0.5 mm, in the form of a hemisphere Distributed on the surface of the flat plate, and the gap in the middle of the ball is close to the size of the water droplet, that is, 2.4~2.6 mm;

[0034] (2) Template making: use a 3D small square printer to print out the template, and print a blank template for comparison; the printing ink used is the polymer ink provided by Formalabs;

[0035] (3) Template surface treatment: After the template is printed, let it dry naturally, and evenly brush the hydrophobic liquid once or twice on the surface of the template plate and obstacles with a brush, and the superhydrophobic template will be obtained after the solvent ...

Embodiment 2

[0041] The method for controlling the contact time of droplet impact in this example, steps (1) template design, (2) template making and (4) droplet impact experimental conditions are the same as in Example 1, taking the center of the water droplet impacting 2 balls as an example, due to the impact The anisotropic characteristics of the time make its momentum concentrated in one direction, so the contact time can be reduced. The impact velocity of water droplets is controlled to be 0.6 m s -1 , 0.75m s -1 , 0.88 m s -1 , the contact time varies with the distance between the balls as image 3 As shown, when the distance between the balls is less than 3 mm, the contact time of the water droplet hitting the ball obstacle template is reduced to about 6 ms compared with the planar blank superhydrophobic template, which is about 50% lower. As the distance between the balls increases, the contact time gradually increases until the distance increases to 5.6 mm, and the contact time...

Embodiment 3

[0043] In this embodiment, the method for controlling droplet impact and splitting is the same as that of Example 1, the steps (1) template design, (2) template making, and (4) droplet impact experiment conditions are the same as in Example 1, and the number of obstacle balls is 1, 2, 3, 4, 5, 6, ... on the template, control different impact speeds, then get different split times i in the exit direction, plus the small water droplets left in the center, the super Hydrophobic template, the number of split droplets obtained is m=n*i+1 (where n is the number of small ball obstacles, i is the number of splits in each exit direction, and m is the total number of split droplets) . In this way, the direction and number of droplet splitting can be controlled, such as Figure 4 shown.

[0044] The above method can control the splitting direction and number of water droplets, but it is found during the experiment that continuous operation cannot be realized due to the existence of sma...

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Abstract

The invention discloses a method for controlling droplet impact form, contact time and droplet controllable splitting. The method comprises the steps of 1 designing a template; 2 manufacturing the template; 3 treating the template surface; 4 carrying out liquid drop impact; and 5 observing and analyzing the impact form and dynamics. Impact dynamics with variable forms is obtained by changing the shape, size, number and position of obstacles on the template, the impact position of liquid drops and other factors. and the boundary between spreading and retreat are broken, so that spreading and retreating coexist in the process of droplet impact. The contact time is shortened, the impact form of a single droplet is variable and controllable, and the splitting of the droplet is controllable during impact by controlling the impact dynamics of different forms. The method is simple to operate, low in cost and good in effect, and can be applied to the fields of self-cleaning, printing, open microfluid, food and drug split charging and conveying and the like.

Description

technical field [0001] The invention relates to the technical field of droplet collision, in particular to a method for controlling droplet collision shape, contact time and controllable splitting of droplet. Background technique [0002] The impact of liquid droplets on solid surfaces has important applications in many fields, such as inkjet printing, paint spraying, pesticide spraying, fire protection and heat transfer, food packaging and other fields. In the last ten years, the impact of water droplets hitting superhydrophobic surfaces has attracted widespread attention. This is because the extremely low surface energy of superhydrophobic surfaces makes water droplets have little energy dissipation during impact and can bounce quickly (millimeter-level water droplet impact The contact time is about 12 milliseconds), so it has been applied in self-cleaning, anti-icing, anti-bacteria and other fields. Therefore, scientists have tried every means to reduce its contact time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01M10/00
CPCG01M10/00G01N13/00
Inventor 宋美荣王顺李伟崔淑敏黄艳杰魏民谢黎霞郑先福
Owner HENAN AGRICULTURAL UNIVERSITY
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