Events
Events
Time：1:30PM, October 26th
Place：F210, School of Mechanical Engineering
Speaker：Dr. Petr Denissenko,The University of Warwick, UK
Host：Pro.Zhao Changyin
Abstract
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. The flow generated by Procambarus clarkii in response to odour stimulation has been studied. We found that while searching for food the crayfish generates one or two outward jets. These jets induce an inflow that draws odour to the crayfish’s anterior chemoreceptors. We have measured 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 100•s 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 mechanical model. The model consists of two nozzles and an inlet and provides two jets and a sink so that the overall mass flux is zero. Use of the model enables analysis of the inflow at various jet parameters. By varying directions and relative intensities of the jets, the crayfish controls the direction of the odour attraction. These results provide a rationale for biomimetic design of a sniffing robot.
Bio:
Grown up in Krasnoyarsk, Siberia, USSR
Graduated from Novosibirsk State University (Plasma Physics) in 1996
PhD studies at Hong Kong UST (Mathematics Department) 1997-2000, unfinished
PhD from the University of Hull, UK, in Applied Mathematics (Fluid Dynamics, Rotating Flows),2004
Since 2007, at The University of Warwick, UK
Current position: Associate Professor in Experimental Fluid Dynamics
CV:
Shanghai Jiao Tong University
Address: 800 Dongchuan Road, Shanghai
200240