67th Annual Meeting of the APS Division of Fluid Dynamics (November 23, 2014 — November 25, 2014)

V0092: Dog lapping in the matrix

  • Sean Gart, Virginia Tech
  • Jake Socha, Virginia Tech
  • Pavlos Vlachos, Purdue University
  • Sunghwan Jung, Virginia Tech
DOI: http://dx.doi.org/10.1103/APS.DFD.2014.GFM.V0092

Animals with incomplete cheeks (i.e. dogs and cats) need to move fluid against gravity into the body by means other than suction. They do this by lapping fluid with their tongue. When a dog drinks, it curls its tongue posteriorly while plunging it into the fluid and then quickly withdraws its tongue back into the mouth. During this fast retraction fluid sticks to the ventral part of the curled tongue and is drawn into the mouth due to inertia. We show examples of this drinking behavior and try to understand the relationship between tongue dynamics and geometry, lapping frequency, and dog weight. We also compare the results with a physical experiment of a rounded rod impact and withdrawal from a liquid bath.

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