Journal of Bionic Engineering

, Volume 15, Issue 3, pp 471–480 | Cite as

Operculum of a Water Snail is a Hydrodynamic Lubrication Sheet

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Abstract

Water snails developed a distinct appendage, the operculum, to better protect the body against predators. When the animal is active and crawling, part of the underside of the shell rests on the outer surface of the operculum. We observed the water snails (Pomacea canaliculata) spend ~3 hours per day foraging, and the relative angular velocity between the shell and operculum can reach up to 10 °·s−1, which might inevitably lead to abrasion on the shell and operculum interface. However, by electron microscopy images, we found that the underside of the shell and outer surface of the operculum is not severely worn, which indicates that this animal might have a strategy to reduce wear. We discovered the superimposed rings distributed concentrically on the surface, which can generate micro-grooves for a hydrodynamic lubrication. We theoretically and experimentally revealed the mechanism of drag reduction combing the groove geometry and hydrodynamics. This textured operculum surface might provide a friction coefficient up to 0.012 as a stability-resilience, which protects the structure of the snail’s shell and operculum. This mechanism might open up new paths for studies of micro-anti-wear structures used in liquid media.

Keywords

water snails operculum micro-grooves friction reduction biomaterial 

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Notes

Acknowledgments

We thank the Centre of Biomedical Analysis of Tsinghua University. This study was funded by the National Natural Science Founding of China (Grant no. 51475258) and the Research Project of the State Key Laboratory of Tribology under Contract SKLT2014B06.

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Copyright information

© Jilin University 2018

Authors and Affiliations

  1. 1.School of Engineering and TechnologyChina University of Geosciences (Beijing)BeijingChina
  2. 2.Division of Intelligent and Biomechanical Systems, State Key Laboratory of TribologyTsinghua UniversityBeijingChina
  3. 3.Department of Mechanical EngineeringTsinghua UniversityBeijingChina

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