Abstract
Numerical modeling of the complex two-phase flow of gas-solid particles in a highly compressible field, as occurs in HVOF spraying, can serve as a tool for optimizing deposition efficiency, nozzle designs, and other parameters. In this paper, the authors develop a numerical model based on Euler’s equation and use it to investigate the effect of flow regime on the velocity of particles in an oxyfuel jet. Simulations based on typical HVOF operating conditions show large variations in the flow regime in regions of high particle concentration. Unlike other modeling approaches, the Eulerian approach predicts that the flow becomes subsonic near the centerline and drag force decreases significantly as do particle velocity and deposition efficiency. The effects of flow regime are also measured experimentally, validating the result. Paper includes a German-language abstract.
