What will be the development of atomizing nozzle technology of China nozzle netwo

What will be the development of atomizing nozzle technology of China nozzle network

Atomization technology has covered almost all industrial fields, such as transportation, agricultural production, and the People's Daily life, as well as various types of fuel (gas, liquid and solid fuel combustion, atomization technology in the industry such as catalytic combustion granulation, food processing, powder coating, pesticide spraying and so on also has a broad application. The atomization technology of liquid fuel is briefly introduced.

Theory of atomization mechanism of liquid

The so-called liquid atomization refers to the physical process of liquid mist or other small fog drops in the gas environment under the action of external energy. For its atomization mechanism, there have been many explanations, such as aerodynamic interference theory, pressure shock theory, turbulence theory, air disturbance theory, boundary condition mutation theory, and so on, now briefly introduced as follows:

1. Turbulence disturbance theory

Turbulence theory holds that the jet atomization process occurs inside the nozzle, and the turbulence of the fluid itself may play an important role. It is also believed that the radial fractional velocity of the fluid in the nozzle, moving as a turbulent pipe flow, will immediately cause a disturbance at the nozzle exit, resulting in atomization.

2. Pressure oscillation theory

It is observed that the pressure oscillation of liquid supply system has a certain effect on atomization process. According to the existence of pressure oscillation in general injection system, it is considered that pressure oscillation plays an important role in atomization.

3. Aerodynamic interference theory

Castleman proposed the aerodynamic interference theory. He believed that the aerodynamic interference between the jet and the surrounding gas caused unstable fluctuations on the surface of the jet. With the increase of velocity, the surface length of unstable wave becomes shorter and shorter until micron magnitude, and the jet is dispersed into mist

4. Abrupt change theory of boundary conditions

The boundary condition abrupt change theory considers that the boundary condition (internal stress) of liquid changes at the nozzle exit. Or laminar jet protrusion loses the nozzle wall constraint, so that the velocity distribution in the section changes suddenly and atomization occurs.

5. Air disturbance theory

Contrary to the turbulence theory, the air disturbance theory holds that the large amplitude pressure disturbance caused by cavitation in the injection system is the cause of atomization.