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Fig. 6. Data (from Table 2) showing
results of fluid mathematical modeling for whales of varying body length
foraging at speeds of 4 km h–1 (solid symbols) or 6 km
h–1 (open symbols). Pressure differential values were derived
from four equations: Bernoulli (circle), two formulations of
Hagen–Poiseuille (triangle, square) and Navier–Stokes (diamond).
Calculations for Lb=5 m are not included here, as these
were based on extrapolated morphometric data. For comparison, there was a mean
500 Pa pressure drop, measured via transducer, in the flow tank
testing of the 1/15 scale physical model (33 cm head length; equivalent of
Lb 
1 m).
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