Research On The Theory Of The Efficient Tertiary Atomization Of The Viscous Liquid

Oil-mist lubrication is a highly efficient micro-lubrication, the principle is to use compressed air to spray lubricant, and work into the lubrication point. Oil-mist lubrication is more advanced for its high efficiency, low fault rate and little pollution to environment, in comparison with traditional lubrication methods. As the research on the theory of oil-mist lubrication goes in depth, we know that particle size is above tens microns after the atomization of the viscous liquid. We hope the size of the oil-mist particle is bigger than0.1μm for the stability and transmission of the oil mist. The conventional once or twice atomization for ultrafine particle below5μm was due to higher energy consumption, so its efficiency is not high. This paper introduced that the larger particles were atomized again through using the residual energy of fluid after the secondary atomization, namely the tertiary atomization.This paper discussed the viscous liquid atomization mechanism, and introduced pneumatic atomization, mechanical atomization and ultrasonic atomization means such as spray, and oil-mist particle size distribution. Focused on the three atomization of viscous liquid based on the impinging stream technology, oil-mist particles involve the elastic force, liquid bridge force, Van der Waals force and electrostatic force in the collision; Combine the model of oil-mist particle collision-fragmentation with the face to face coaxial collision experiment to analyse the change of the oil-mist particles size after the tertiary atomization, and finish the design and construction of the oil-mist particle collision experiment station.Experiments carried out testing the effect on the atomizer, the oil mist particles collision experiment will use the atomizers that their throat diameter are between1.6mm～2.4mm. Through the analysis of a large number of experimental data we obtained the relationship of inlet pressure and the oil-mist particle size after the tertiary atomization, compressed air flow and the oil-mist particle size after the tertiary atomization, and the relationship of the change rate of the oil-mist particle sizes and the Weber number was also calculated. Select the throat diameter of the atomizer and inlet pressure as the main factors that impact the change rate of the oil-mist particle sizes, use the orthogonal experiment to determine the throat diameter of the atomizer and inlet pressure for the best effect of tertiary atomization, and determine the throat diameter of the atomizer is the key factor affecting test results.