An experimental system and experimental method for micron-sized particles colliding with different surfaces

Abstract

The invention discloses an experiment system and an experiment method for collision between micro-scale particles with controllable temperature and humidity and different surfaces, and belongs to a gas-solid flow experiment device. The experiment system mainly comprises a micro-scale particle supply unit and a striking unit which is arranged in an experiment cabin, wherein the micro-scale particle supply unit is used for supplying a carrier gas and a micro-particle mixed gas at a certain speed to the striking unit; the striking unit comprises a striking platform and a micro-scale particle supply pipe; thermocouples are arranged in a gas outlet in the micro-scale particle supply pipe and on the outer wall of the striking platform; a light source, a quartz glass view window, the striking unit and a high-speed camera are arranged in the same straight line; the high-speed camera is electrically connected with a computer. According to an experiment device, the incident speed, the rebounding speed and the critical trapping speed when micro-scale particles are struck with the different surfaces can be obtained; an energy dissipation mechanism when the micro-scale particles are struck with the different surfaces under the particle environments of different temperatures and humidity, different materials and different particle sizes is researched; experimental verification is provided for gas-solid flow and particle impact and particle precipitation related to the industrial field.

Description

technical field [0001] The invention relates to an experimental system and an experimental method for the collision of micron-sized particles with controllable temperature and humidity and different surfaces, and belongs to the technical field of gas-solid two-phase flow experimental devices. Background technique [0002] The phenomenon of fine particle deposition exists in many fields such as energy, environmental engineering, chemical industry, microelectronics and mechanical engineering. On the one hand, fine particle deposition generally has a negative effect, such as the heat transfer deterioration caused by the accumulation of dust on the surface of the heat exchange tube in the boiler; Deposition in MEMS may cause mechanical failure or cause flow blockage, deposition of atmospheric fine particles in the human respiratory tract / alveoli causing disease, etc. On the other hand, fine particle deposition can be enhanced in practice. Taking the field of energy and power as...

AI Technical Summary

Problems solved by technology

On the one hand, fine particle deposition generally has a negative effect, such as the heat transfer deterioration caused by the accumulation of dust on the surface of the heat exchange tube in the boiler; Deposition in MEMS may cause mechanical failure or flow blockage, deposition of atmospheric fine particles in the human respiratory tract / alveoli causing disease, etc.

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