Physics – Fluid Dynamics
Scientific paper
2006-10-10
Physics
Fluid Dynamics
20 pages, 9 figures, flow visualization
Scientific paper
Crayfish are nocturnal animals that mainly rely on their chemoreceptors to locate food. On a crayfish scale chemical stimuli received from a distant source are dispersed by an ambient flow rather than molecular diffusion. When the flow is weak or absent, food search can be facilitated by currents generated by the animal itself. Crayfish employ their anterior fan organs to produce a variety of flow patterns. Here we study the flow generated by Procambarus clarkii in response to odour stimulation. We found that while searching for food the crayfish generates one or two outward jets. These jets create an inflow which draws odour to the crayfish's anterior chemoreceptors. We quantified velocity fields in the inflow region using Particle Image Velocimetry. The results show that the inflow velocity decreases proportionally to the inverse distance from the animal so that it takes about a minute for an odour plume to reach the animal's chemoreceptors from a distance of 10 cm. We compare the inflow generated by live crayfish with that produced by a mimicking device, a phantom. The phantom consisted of two nozzles and an inlet providing two jets and a sink so that the overall mass flux was zero. The use of a phantom enabled us to analyze the inflow at various jet parameters. We showed that variation of the jets' directions and relative intensities allows changing the direction of odour attraction. These results provide a rationale for biomimetic robot design. We discuss sensitivity and efficiency of such a robot.
Breithaupt T.
Denissenko Petr
Lukaschuk Sergei
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