Particle impact and observation device and method

Abstract

The invention discloses a particle impact and its behavior observation device and a particle impact method. The impact device includes an acceleration chamber, a separation chamber and an impact chamber arranged up and down in sequence. The acceleration chamber includes a mixing section, a tapering section and an accelerating straight section from top to bottom, and an aerosol inlet is provided at the top. The accelerating straight section is embedded in the separation chamber, and an inlet for accelerated particles is provided between the separation chamber and the impact chamber. The observation device also includes a high-speed image acquisition device and a light source. When observing, inject liquid into the impact chamber or place a flat plate into the impact chamber to form a two-phase interface, and align the light source and high-speed image acquisition device to the two-phase interface to collect high-speed images. The accelerated gas flow carrying micron-sized particles enters the acceleration chamber for acceleration, and is separated in the separation chamber, so that micron-sized particles or liquid droplets hit the gas-liquid interface or gas-solid interface at different angles and speeds and obtain their impact images. The invention has the advantages of high particle impact speed, wide application range, flexible use adjustment and the like.

Description

technical field [0001] The invention relates to a particle impact and observation device and method, in particular to the separation and impact of micron-sized particles or droplets, and belongs to the field of aerosol technology. Background technique [0002] The impact of particles or droplets on phase interfaces is a common phenomenon in nature and industrial processes. For example, the process of particle (or droplet) hitting the liquid surface is the basic process of natural wet deposition cleaning atmospheric aerosol and industrial wet spray dust removal, metallurgical spray technology and chemical catalytic reaction; and droplet hitting solid surface is also the basic process of inkjet Applications include printing, surface coating and spray cooling; particle impacts on solid surfaces are also common in industrial equipment. The rich physical phenomena contained in the impact of particles or droplets on the phase interface are also the basic and frontier issues conce...

AI Technical Summary

Problems solved by technology

The process of high-speed impact of micron-sized droplets on the interface can be achieved by using an atomizing nozzle, but there will be high droplet concentration and wide particle size distribution, making it difficult to clearly observe the process of a single droplet impacting the interface on-line

The process of micron-sized particles hitting the interface at high speed can be realized by using the acceleration nozzle to spray aerosol particles, but at the same time, the accelerated air flow will affect the boundary layer at the interface, thereby affecting the liquid surface and the particles during the impact process.

Images