When the air atomizing nozzle is used, when the atomizing nozzle is spraying, it will be found that the effect of the spray sometimes has an impact. Today, I will take you to understand what factors affect the spray effect of the air atomizing nozzle.
1. Influence of pore diameter
When other geometric factors of the nozzle (the average number of pores are all 4) remain unchanged, under the same working conditions, the atomization fineness of the nozzle decreases with the increase of the diameter of the pores. When the gas-liquid ratio is 0.4 and the air pressure is 5bar, the atomization fineness is below 10um, indicating that the outlet velocity has reached the speed of sound at this time, and the mixing chamber pressure is gradually reaching and exceeding the critical pressure ratio.
2. The influence of air pressure
When the air pressure increases from 2bar to 5bar, the atomization particle size decreases from 25um to about 7um; when the air pressure value continues to increase and exceeds 5bar, the curve becomes flat. At this time, increasing the air pressure will not cause the atomization to become thinner, indicating that At this time, the nozzle has reached the speed of sound. In this state, the outlet velocity of the high-speed airflow plays a decisive role in the atomization of the air atomizing nozzle. At this time, the gas-liquid ratio has little effect on the particle size.
3. The effect of the number of pores
The atomization fineness of the nozzle decreases with the increase of the number of pores. When the number of pores is greater than 6, the decreasing trend of atomization fineness becomes slower. When the number is between 4 and 6, the average particle size is below 10um, indicating that increasing the contact area between the gas flow and the liquid flow in the mixing chamber no longer plays a major role in the atomization fineness, and the mixing chamber has reached the critical value. , the downward trend of MMD slowed down.
4. Influence of the gas-liquid ratio
The atomization particle size of the internal mixing air atomizing nozzle decreases with the increase of the gas{{0}}liquid ratio. When the gas-liquid ratio increases to 0.4, and the air-liquid ratio continues to increase, the atomization fineness does not change significantly, and in the same gas Under the liquid ratio, the change of the hydraulic value has no direct effect on the atomization, and the main factor affecting the quality of the atomization is the air velocity. Under a certain gas-liquid ratio, the atomization fineness can reach 10um. According to the experiment, the atomization fineness does not change much with the diameter of the liquid hole.
