Hydrodynamic performance of marine mussel, Mytilus galloprovincialis, is studied with time-resolved particle image velocimetry. We evaluated inhalant flow, exhalant jet flow, suction performance, and flow control capabilities of the mussels quantitatively. Inhalant flow structures of mussels are measured at the coronal plane first time in literature. Nutrient fluid is convected into the mussel by three-dimensional sink flow. Inhalant velocity reaches its highest magnitude inside of the mussel mantle while accelerating outward the mussel. We calculated pressure gradient at the coronal plane. As inhalant flow approaches mussel shell tip, suction force generated by the inhalant flow increases and becomes significant at shell tip. Likewise, exhalant jet flow regimes are studied for 17 mussels. Mussels can control their exhalant jet flow structure from single potential core region to double one or vice versa. Peak exhalant jet velocity generated by the mussels changes between 2.77 cm/s and 11.1 cm/s as a function of mussel cavity volume. Measurements of hydrodynamic dissipation, at the sagittal plane, revealed no interaction between the inhalant and exhalant jet flow, indicating energy efficient synchronized pumping mechanism. This efficient pumping mechanism is associated with the flow-turning angle between inhalant and exhalant jet flows, ∼90o (s.d. 12o).
- Received August 1, 2016.
- Accepted September 5, 2016.
- © 2016. Published by The Company of Biologists Ltd
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