There are many types of industrial processing fluids, and they are also commonly used in the production process. It is a matter of great significance to minimize the concentration of oil mist in the air, which is not only beneficial to the health of employees, but also to the long-term health of enterprises. development.

Two major mechanisms of industrial processing fluid oil mist formation:

The aerosols produced during the processing of industrial processing fluids are often referred to as "oil mist". The size and number of droplets generated during this process are the key variables in the formation of oil mist, and the process of oil mist formation in industrial machining fluids is complex and involves many variables in the manufacturing process. However, there are two main mechanisms for the formation of oil mist, namely the atomization and evaporation of industrial processing fluids. The violent impact of the tool, etc., forms fine particles floating in the working environment; the evaporation of industrial processing fluid is mainly due to the large amount of heat generated during the processing. When the temperature is high, boiling occurs on the solid-liquid contact surface and steam is generated, and the steam condenses with small droplets or other particles in the air as the core to form an oil mist.

5 Forms of Industrial Process Fluid Oil Mist Formation

According to the different ways of forming oil mist, it can be mainly divided into the following ways:

1. Oil mist formed by collision (collision of liquid and solid matter): When larger droplets collide with hard surfaces such as machines and workpieces, part of the kinetic energy of the droplets is converted into surface energy, so that large droplets form fine liquids. Droplets float in the working environment, forming oil mist with larger particles;

2. Oil mist formed by rotary atomization: rotating machinery or components can act as rotary atomizers. The size of the oil droplets depends on the actual force and intermolecular force. The centrifugal force generated by the high-speed rotation makes a large number of small droplets detach and float into the air of the processing chamber to form oil mist;

3. Foam or bubble oil mist: When the metalworking fluid is in contact with air, bubbles (foam) are formed due to the entry of air, and the rupture of the foam will also lead to the formation of oil mist. There are many factors that can lead to the formation of metalworking fluid foam, such as the type of product selected, the hardness of the water quality, the contaminants (organic and inorganic) in the cutting fluid, the concentration of the cutting fluid used, etc.;

4. Oil mist formed by injection: After the metal working fluid is ejected from the nozzle, a high-speed jet is formed under pressure. The jet consists of a liquid core area without air involvement and a surrounding gas-liquid mixing area, and there is a strong shear in the jet. The shear layer, the instability of the shear layer itself and its interaction with the surrounding air form a large number of fine droplet particles, which form the oil mist. The size and number of droplets formed are related to the diameter and pressure of the nozzle.

5. Volatile oil mist (smoke): When the metalworking fluid cools the tool, a large amount of heat energy is introduced into the liquid. When its temperature is higher than the saturation temperature, evaporation occurs, and the steam is formed by small droplets in the air or other The particles are condensed as the core and form a uniform dispersion system in the gas medium, that is, they float in the air of the workplace in the form of aerosols.

Industrial processing fluid oil mist particle size

The way the oil mist is generated affects the size of the oil mist particles. Generally, the oil mist particles generated by mechanical atomization mainly exist in the form of droplets, and their diameters are generally in the range of 2-10 microns. The particle size of oil mist particles produced by evaporation is generally below 2 microns.

According to research, oil mist droplets and oil vapor with large particles are less harmful to the human body, mainly because the large particle size particles cannot enter the lungs through the nose and bronchi, and the oil mist vapor is inhaled into the lungs and exhaled. Not trapped in alveoli. Only in the form of droplets with a particle size of less than 5 microns can enter the lungs and deposit in the lungs, causing harm to the human body.