1995 Volume 21 Issue 4 Pages 723-731
The mechanism of particle removal was studied using a high speed air jet. The experiment was conducted for latex particles of 110 μm diameter adhering to a plane surface of glass under various jet pressures and impinging angles. It was found that the removal force decreased with decreasing the impinging angle below 45°. For an impinging angle above 45°, the removal force did not depend on the angle. From the experimental data, the relation between removal force which remove 50% of deposited particles and particle diameter was elucidated.
The relation between removal force and particle diameter could not be explained by the conventional model, in which the removal force was assumed to be equal to the bending moment calculated by use of the time-averaged velocity profile. Experiments conducted under various jet duration times revealed that the change of removal efficiency with time was related to the removal force. Thus, it was concluded that the flow controlling the removal force was not only caused by the average flow but also by the fluctuation of the flow.
