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Evidence for tip velocity oscillations in dendritic solidification
J C LaCombe1, M B Koss, J E Frei
1Metallurgical and Materials Engineering, Mackay School of Mines, University of Nevada, Reno, Nevada 89436, USA. lacomj@mines.unr.edu
Abstract:
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.