Abstract
To identify the velocity distributions of abrasive particles in abrasive liquid nitrogen jet, a computational fluid dynamic model was built to simulate the flow field of abrasive liquid nitrogen jet. The velocity of particles in liquid nitrogen jet was solved using the Lagrangian discrete phase model by coupling the physical property equations of nitrogen and then compared with that in water jet. Additionally, a parametric sensitivity analysis was performed to study the effect of both abrasive particle and jet parameters on particles velocity distributions in liquid nitrogen jet. The results showed that the high pressure liquid nitrogen which carried abrasive particles could generate high speed abrasive liquid nitrogen jet under the acceleration action of jet nozzle. Given the same pressure drop of nozzle, the maximum velocity of particle in liquid nitrogen jet was about 8.04% higher than that in water jet. With regard to abrasive particle parameters, the velocity of particles in liquid nitrogen jet decreased with the growth of the particle diameter and mass flow rate while was slightly affected by particle initial velocity. For jet parameters, the velocity of particles increased with the growth of nozzle pressure drop, nozzle diameter and fluid temperature, but was hardly influenced by confining pressure. This study is expected to provide theoretical references for design and application of abrasive liquid nitrogen jet.
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