9780521861724htl 1..2

(b)

1

0.8

0.6

0.4

0.2

0

0.00001 0.0001 0.001

Reynolds number

0.01 0.1 1

Leakiness

(a)

Particle encounter rate

Re = 1

Log velocity

Re = 10

Figure 2.1Functional transitions in relation to Reynolds number. (a) Generalized pattern
of particle encounter for direct interception inflections indicate a transition in encounter
rate withRe(redrawn from Shimeta & Jumars, 1991 ), (b) leakiness of an array of hairs,
plotted againstRe. Leakiness is defined as the volume of fluid passing between two
elements (hairs) in an array, divided by the volume that would flow through the space if
the elements were not present. Lines represent gap:element diameter ratios: squares
50:1, triangles 15:1, diamonds 5:1, circles 0.6:1 (redrawn from Koehl, 1995 ).

BODY SIZE AND SUSPENSION FEEDING 21