Evaluation of Heat Transfer Transport Coefficient for Cold Spray Through Computational Fluid Dynamics and Particle In-Flight Temperature Measurement Using a High-Speed IR Camera

Abstract

This work aims at obtaining experimental particle temperature readings during the cold spray (CS) process using a high-speed, high-definition infrared (IR) camera for multiple gas stagnation parameters to infer the suitability and accuracy of Nusselt number and drag coefficient correlations widely used in CS modeling. Measured particle temperatures are compared with values obtained through numerical modeling. Measured particle velocity using recorded data from the IR camera, based on particle streak and particle tracking velocimetry methods, is compared to values obtained from simulations. Additionally, particle velocities acquired using a Cold Spray Meter are also considered. Results demonstrate that only one of all common Nusselt correlations typically used in CS modeling results in accurate particle temperature predictions. Furthermore, the study shows that the drag coefficient correlation must incorporate the particle Mach number in order to provide acceptable particle velocity predictions.