Axial powder stream concentration between the nozzle end and the deposition point is an important process parameter in the laser aided material deposition process. The powder concentration is greatly influenced by the nozzle geometry in use. This paper describes the numerical and experimental analysis of this important parameter in relation to the coaxial nozzle. The experiments are performed with the different nozzle geometries to generate various flow patterns of the gravity fed powder in a cold stream. The results of the experimental analysis are compared with the numerical simulation and found justified. These results are used in concluding the significance of important nozzle parameters for various powder concentration modes.

Meeting Name

15th Annual Solid Freeform Fabrication Symposium (2004: Aug. 2-4, Austin, TX)


Mechanical and Aerospace Engineering


This research was supported by the National Science Foundation Grant Number DMI-9871185, the grants from the U.S. Army Aviation and Missile Command (AMCOM) and U.S. Air Force Research Laboratory contract # FA8650-04-C-5704. Their support is greatly appreciated.

Keywords and Phrases

Deposition Process; Flow Patterns; Powder Stream

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type




Publication Date

04 Aug 2004

Included in

Manufacturing Commons