Velocity distribution of slurry droplets inside and outside jets for micro slurry-jet erosion

Velocity measurement of slurry droplets with frame straddling and PIV

Abstract

A micro slurry-jet erosion (MSE) method is proposed for the evaluation of thin coating surface strength. Surface strength is evaluated from wear patterns formed by the ejection of high-speed slurry-jets into the specimen via the MSE method. The material wear from erosion depends on the collision energy of solid particles. Thus, it is important to estimate particle velocity of the materials at collision to understand the wear mechanism. In this paper, the time series of slurry droplet behavior inside and outside the jets were acquired and analyzed using a high-speed video camera synchronized with a laser through Particle Image Velocimetry. In the results, the maximum droplet velocity was 40 m/s when the air flow rate is 30 L/min and 110 m/s when the air flow rate is 90 L/min. Additionally, there are some unmeasurable areas inside the jets due to numerous droplets within the measuring area.