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Fig. 5. PIV measurements of water velocities relative to a dynamically scaled model
of the midsection of the lateral flagellum of the antennule of a P.
argus during (A) the downward (to the left) flick and (B) the upward (to
the right) return stroke. Black arrows indicate direction of antennule motion.
Small yellow arrows in the fluid represent the water velocity vectors relative
to the antennule lateral flagellum. The model operated at the same Re
as the real antennule, and the velocities shown here have been converted to
the velocities that would occur relative to the real lobster antennule, which
flicks downward at 9 cm s–1 and returns upward at 2.0 cm
s–1. Background color indicates velocity magnitude.
Velocities were computed as the average of 90 measurements at each location.
The locations of the guard hairs are shown by wide white curves, and of the
aesthetascs by a box outlined with a narrow white line. In A, location 1 is
referred to as the ventral side of the hair array, and location 2 is referred
to the dorsal side of the hair array.
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