Prediction of Particle Velocity for the Cold Spray Process
Abstract
The ability to predict particle velocity is key to the prediction of cold spray performance. Individual particles must exceed a material dependent critical velocity in order to deposit and form a coating. Particle velocities can be calculated from the drag relationship between the particle and flowing gas. The relative accuracies of a one-dimensional (1-D) calculation vs. a twodimensional (2-D) calculation, in comparison to measured values, would help determine whether the simple 1-D calculation can be used instead of the more complicated 2-D calculation. Both types of calculation were performed for a given nozzle and compared with measured values. It was found that the 1-D calculation resulted in velocities about 7% higher than measurement, while 2-D calculations yielded velocities 7% lower than measured values. The 2-D calculation yields more information, but the fast, convenient 1-D calculation has adequate information and accuracy to be used for most particle velocity calculations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2011
- Accession Number
- ADA551777
Entities
People
- Phillip F . Leyman
- Surya P. Dinavahi
- Victor K. Champagne
Organizations
- United States Army Research Laboratory