Photonegative Sequence Sample
Sample of two photonegative sequences from the flight experiment. The first sequence running down the page is at a supercooling of approximately 0.11 K with photographs taken every 6 minutes and 42.5 seconds. On the last photo the solid is forming on the surface of the window. The second sequence is at a supercooling of approximately 1.02 K with photographs taken every 6.75 seconds.

Graph of Tip Position vs. Time
Dendrite tip position-time plot at a supercooling of 0.141 K measured from a sequence of 35mm photonegatives exposed during the flight experiment. The velocity taken from this data uses only the first four tip positions as the last two are no longer part of a steady state growth.

Graph of Tip Radius vs. Distance From Tip
Dendrite tip radius of curvature regressed from the dendrites solid-liquid interface profile as a function of the sample range from the tip of the dendrite. For small sample ranges the scatter in the position of the interface makes measurements imprecise, and at large sample ranges the emerging side branches makes measurements imprecise.

Graph of Tip Velocity vs. Supercooling
Steady-state dendritc growth velocity versus supercooling. Dendritic growth velocities of succinonitrile observed in microgravity differ substantially from those measured under terrestrial conditions. The microgravity and terrestrial data sets converge at approximately 2.0 K supercooling. The data above 0.045 K supercooling can be fit to the combined Ivantsov-Scaling rule theories with a scaling constant of 0.0175.

Graph of Tip Radius vs. Supercooling
Steady-state dendritic growth velocity versus supercooling. Dendritic growth velocities of succinonitrile observed in microgravity differ substantially from those measured under terrestrial conditions. The data above 0.045 K supercooling can be fit to the combined Ivantsov-Scaling rule theories with a scaling constant of 0.0185.

Graph of Tip Velocity vs. Supercooling
Steady-state dendritic growth velocity versus supercooling at higher supercoolings. The theory line regressed to the microgravity data matches the data from Glicksman, Schaefer and Ayers' experiments with succinonitrile up to a supercooling of approximately 5.0 K, where, perhaps, attachment kinetics become important.

Graph of Péclet Number vs. Supercooling
Péclet number versus supercooling. The Péclet number is a zero parameter test of the Ivantsov model as there are no adjustable parameters. The data are in approximate agreement with theory, except at the lower supercoolings where convective or chamber effects become important.

Graph of Scaling Rule vs. Supercooling
The scaling parameter data from both microgravity and terrestrial experiments are indistinguishable from each other. In spite of the large uncertainties is some of the measurements, the scaling parameter does not appear to be a constant over the full supercooling range of these experiments.

Graph of Péclet Number vs. Supercooling in diffusion limited supercooling range
Detailed view of the Péclet number versus supercooling in the supercooling range where dendritic growth is diffusion-limited with the boundary conditions at infinity. Although the theory matches the data at 1.0 K supercooling, the rest of the data in this range is significantly below that calculated by theory.

Graph of Scaling Parameter vs. Supercooling in diffusion limited supercooling range
Detailed view of the scaling parameter versus supercooling in the supercooling range where dendritic growth is diffusion-limited with the boundary conditions at infinity. Even in this reduced supercooling range, the scaling parameter can not be described by a single average value. The temperature dependence of the scaling parameter in this supercooling range is greater than over the full supercooling range.