Figure 3. Growth of the finger generation zone (h) defined
by the distance encompassed by 61 standard deviation of the
horizontally averaged c/c0 field. Also shown are t1/ 2 curves to
show that transport agrees with diffusive behavior for the Rr 5
2.8 experiment but is slightly faster for the Rr 5 2.4 experiment.
For the Rr 5 1.4 and 1.8 experiments, measurement of
the zone became vague, as upward traveling fingers met the
oppositely moving advective mass to create a large vertical
zone of nearly constant concentration. Therefore not all of the
late-time data are plotted.
concentration in the upper half of the cell slows. For the two
experiments nearest stability (initial Rr 5 2.4 and 2.8), the
time rate of change in concentration is very nearly t1/ 2.