TY - JOUR
T1 - Computational analysis of the effect of nozzle cross-section shape on gas flow and particle acceleration in cold spraying
AU - Yin, Shuo
AU - Wang, Xiao fang
AU - Li, Wen ya
PY - 2011/1/25
Y1 - 2011/1/25
N2 - In cold spraying, the spraying of certain complicated surfaces may require nozzles with special cross-sections. In this study, numerical investigation is conducted to study the effect of nozzle cross-section shape on gas flow and particle acceleration in cold spraying. The comprehensive comparison between rectangular nozzles and elliptical nozzles indicates that rectangular nozzles result in slightly lower mean particle impact velocity than elliptical nozzles. However, for rectangular nozzles, more particles may achieve relatively high velocity due to the larger sectional area of their potential core. Furthermore, it can also be found from the numerical results that the mean particle impact velocity increases gradually with the decrease in Width/Length ratio (W/L) of the cross-section because of the diminishing bow shock size. However, when reducing the W/L to 0.2, the mean particle impact velocity begins to decrease steeply, which may be attributed to the rather small area of the potential core for the case of W/L = 0.2. Moreover, the systematic study on the powder release position shows that releasing particles from the nozzle inlet can ensure that particles achieve a high impact velocity and temperature.
AB - In cold spraying, the spraying of certain complicated surfaces may require nozzles with special cross-sections. In this study, numerical investigation is conducted to study the effect of nozzle cross-section shape on gas flow and particle acceleration in cold spraying. The comprehensive comparison between rectangular nozzles and elliptical nozzles indicates that rectangular nozzles result in slightly lower mean particle impact velocity than elliptical nozzles. However, for rectangular nozzles, more particles may achieve relatively high velocity due to the larger sectional area of their potential core. Furthermore, it can also be found from the numerical results that the mean particle impact velocity increases gradually with the decrease in Width/Length ratio (W/L) of the cross-section because of the diminishing bow shock size. However, when reducing the W/L to 0.2, the mean particle impact velocity begins to decrease steeply, which may be attributed to the rather small area of the potential core for the case of W/L = 0.2. Moreover, the systematic study on the powder release position shows that releasing particles from the nozzle inlet can ensure that particles achieve a high impact velocity and temperature.
KW - Cold spraying
KW - Nozzle shape
KW - Numerical simulation
KW - Particle acceleration
KW - Powder release position
UR - http://www.scopus.com/inward/record.url?scp=78650219114&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2010.11.002
DO - 10.1016/j.surfcoat.2010.11.002
M3 - 文章
AN - SCOPUS:78650219114
SN - 0257-8972
VL - 205
SP - 2970
EP - 2977
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 8-9
ER -