Hits:

Indexed by:会议论文

Date of Publication:2011-01-01

Included Journals:CPCI-S

Volume:4

Page Number:536-541

Key Words:Cold spraying; free jet; impinging jet; numerical simulation; optimal standoff distance

Abstract:The gas flow structure outside the nozzle takes a significant role in particle impinging velocity in cold spraying. In this study, numerical method is employed to study the single-phase free jet flow and the two-phase impinging jet flow outside the nozzle. Based on the simulated results, it is found that nozzle outlet diameter significantly affects the gas flow field and thus the particle acceleration. Between the nozzle outlet and substrate, there exists an optimal standoff position where sprayed particles can obtain the maximum impinging velocity. Besides, this optimal standoff distance increases linearly with the increment in nozzle outlet diameter.