Abstract
The model consists of an expanding and compressing rotational symmetric profile with prescribed movement. A posterior valve will open according to chosen boundary conditions. All calculations are based on unsteady flow as this is an essential feature of prey-sucking in e.g. 50 msec. Calculations prove that the effect of friction is negligible in typical suction acts. Movements of the profile were given in accordance with actual movement data. Experimental data from transducer measurements (pressure and velocity) of prey-sucking fish were used to test the model throughout its construction. The external flow to the “mouth” and the translation of the profile caused by suction are modelled by combining a parallel stream with a circular vortex filament at the lips of the fish. Equations to calculate velocities and pressures, before and after opening of the posterior valve are given. The model provides evidence for a narrow range of possible combinations of size and movement characteristics, indicating possible restrictions in head construction of fish.
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