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Experimental device for promoting droplet impact splashing and application of experimental device

A droplet impact and experimental device technology, applied in the field of experimental devices, can solve problems such as limiting the potential application of droplets

Active Publication Date: 2020-08-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have two shortcomings: one is that the current method is only suitable for the suppression of droplet splashing phenomenon, however, in some technical fields such as spray cooling and internal combustion engine combustion, droplet splashing is very beneficial and needs to be promoted. a phenomenon
The second is based on the defects of the method itself, such as the need for a low-pressure environment or high requirements for the hardness of the substrate, which will greatly limit the potential application of droplet impact in various fields.

Method used

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  • Experimental device for promoting droplet impact splashing and application of experimental device
  • Experimental device for promoting droplet impact splashing and application of experimental device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Using the droplet impact splash experimental device to study the droplet impact splash promotion phenomenon, including the following steps:

[0035] S1: Add pure glycerin (viscosity about 1490mPa·s) and water (viscosity about 1mPa·s) into high-viscosity liquid injection pump 11 and low-viscosity liquid injection pump 12 respectively;

[0036] S2: adjust the positions of the light source 31, the reflector 23 and the high-speed camera 32, subject to the maximum light intensity that the high-speed camera 32 can receive;

[0037] S3: Squeeze out a 10 μL drop of water through the low-viscosity liquid injection pump 12 and hang it on the head of the low-viscosity liquid injection needle 14. The vertical distance between the drop and the superamphiphobic surface is 22 cm; When the low-viscosity liquid injection needle 14 breaks away, extrude pure glycerin droplets of the same size from the high-viscosity liquid injection needle 13 with a vertical distance of 0.5mm and a horizo...

Embodiment 2

[0040] In this example, the vertical distance between the water droplet and the superamphiphobic surface in Example 1, that is, the impact height of the two-component droplet 4 is changed to 24 cm, 28 cm and 32 cm respectively, and other steps are the same as in Example 1. The final result obtained is the same as the experimental result of Example 1.

Embodiment 3

[0042] In this embodiment, the sizes of the water droplets in the first embodiment are changed to 7 μL, 12 μL, and 15 μL respectively, and other steps are the same as in the first embodiment. The final result obtained is the same as the experimental result of Example 1.

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Abstract

The invention discloses an experimental device for promoting droplet impact splashing and application of the experimental device. The experimental device comprises a droplet forming part, an impact part and a recording part; the droplet forming part comprises a low-viscosity liquid injection pump and a high-viscosity liquid injection pump which are connected with a low-viscosity liquid injection needle and a high-viscosity liquid injection needle through injection pipes respectively; the low-viscosity liquid injection needle and the high-viscosity liquid injection needle are arranged in a staggered mode; the impact part comprises a lifting table; the lifting table is located below a syringe needle; an impact plate is placed above the surface of the lifting table; the upper plate surface ofthe impact plate is coated with an impact layer; the recording part comprises a light source, a high-speed camera and a reflector; the light source is used for illuminating the impact plate and the reflector; and the high-speed camera is used for recording the dynamic process and splashing form of a drop which impacts the impact plate. The invention aims to research the impact splashing promotionphenomenon of the drop by constructing a special experimental device and designing a two-component liquid drop experiment based on the device so as to provide theoretical support for how to improve the combustion and spray cooling efficiency of an internal combustion engine and the like.

Description

technical field [0001] The invention relates to an experimental device, in particular to an experimental device for promoting droplet impact and splashing and its application. Background technique [0002] As a very common capillary phenomenon in nature, droplet impingement on solid surfaces has attracted extensive attention based on its applications in agriculture such as irrigation, drug spraying, and industry such as thermal spraying and spray cooling. In recent years, due to the rapid development of high-speed imaging technology, this transient droplet impact behavior has been clearly characterized. By changing different impact parameters, such as impact velocity, droplet properties, and wettability of the solid surface, droplet impact exhibits different impact phenomena such as deposition or spreading on the surface, bouncing off after spreading on the surface, or spreading and shrinking on the surface The process produces broken small droplets. Among them, the sputte...

Claims

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Application Information

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IPC IPC(8): G01M10/00G01N13/00G01N21/84
CPCG01M10/00G01N13/00G01N21/84G01N2021/8411
Inventor 邓旭于凡斐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA