Evidence for tip velocity oscillations in dendritic solidification.
Dendritic growth experiments were conducted in the reduced-convection environment aboard the space shuttle Columbia on STS-87. Spectral analysis was performed on 30-frame/s video data during growths of isothermal dendrites. Results indicate that pivalic acid dendrites exhibit a subtle oscillatory behavior of the axial growth velocity near the tip, with a frequency component that is associated with the sidebranch formation process.
LaCombe
J C
JC
Metallurgical and Materials Engineering, Mackay School of Mines, University of Nevada, Reno, Nevada 89436, USA. lacomj@mines.unr.edu
Koss
M B
MB
Frei
J E
JE
Giummarra
C
C
Lupulescu
A O
AO
Glicksman
M E
ME