Chemistry Reference
In-Depth Information
flow. By acting like a solid interface, a surfactant surface can dramatically
alter the flow field at the interface. Fluid velocities at the interface are re-
duced, inhibiting eddy motion near the surface. This affects the degree of
vertical upwelling at the surface through a reduction in the surface diver-
gence.
(a) Clean interface
(b) Microlayer interface
Fig. 6.
Variation of the near-surface radial component of velocity. Panel (a) is for
a clean interface; panel (b) is for the stearic acid microlayer. All variables are as
defined in Fig. 5,
u
is the radial component of velocity, and
U
is the vertical free
propagation speed of the vortex ring. Velocities are taken along a horizontal sec-
tion at a depth
d
/
D
= 0.03 (0.125 cm). The temporal spacing between curves, 'W,
is 0.15. Taken from McKenna (1997)
