Dermal Denticles of Three Slowly Swimming Shark Species: Microscopy and Flow Visualization

Katrine Feld, Anne Noer Kolborg, Camilla Marie Nyborg, Mirko Salewski, John Fleng Steffensen, Kirstine Berg-Sørensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Shark skin has for many years inspired engineers to produce biomimetic structures reducing surface drag or acting as an anti-fouling layer. Both effects are presumed to be consequences of the structure of shark skin that is composed of arrays of so-called dermal denticles. However, the understanding of the full functional role of the dermal denticles is still a topic of research. We report optical microscopy and scanning electron microscopy of dermal denticles from three slowly swimming shark species for which the functional role of the dermal denticles is suggested as one of defense (possibly understood as anti-fouling) and/or abrasion strength. The three species are Greenland shark (Somnosius microcephalus), small-spotted catshark (Scyliorhinus canicula) and spiny dogfish (Squalus acanthias). Samples were taken at over 30 different positions on the bodies of the sharks. In addition, we demonstrate that the flow pattern near natural shark skin can be measured by micro-PIV (particle image velocimetry). The microfluidic experiments are complemented by numerical flow simulations. Both visualize unsteady flow, small eddies, and recirculation bubbles behind the natural dermal denticles.
Original languageEnglish
Article number38
JournalBiomimetics
Volume4
Issue number2
Number of pages20
ISSN1059-0153
DOIs
Publication statusPublished - 2019

Keywords

  • Shark skin
  • Micro-PV
  • Microfluids

Cite this

Feld, Katrine ; Kolborg, Anne Noer ; Nyborg, Camilla Marie ; Salewski, Mirko ; Steffensen, John Fleng ; Berg-Sørensen, Kirstine. / Dermal Denticles of Three Slowly Swimming Shark Species: Microscopy and Flow Visualization. In: Biomimetics. 2019 ; Vol. 4, No. 2.
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title = "Dermal Denticles of Three Slowly Swimming Shark Species: Microscopy and Flow Visualization",
abstract = "Shark skin has for many years inspired engineers to produce biomimetic structures reducing surface drag or acting as an anti-fouling layer. Both effects are presumed to be consequences of the structure of shark skin that is composed of arrays of so-called dermal denticles. However, the understanding of the full functional role of the dermal denticles is still a topic of research. We report optical microscopy and scanning electron microscopy of dermal denticles from three slowly swimming shark species for which the functional role of the dermal denticles is suggested as one of defense (possibly understood as anti-fouling) and/or abrasion strength. The three species are Greenland shark (Somnosius microcephalus), small-spotted catshark (Scyliorhinus canicula) and spiny dogfish (Squalus acanthias). Samples were taken at over 30 different positions on the bodies of the sharks. In addition, we demonstrate that the flow pattern near natural shark skin can be measured by micro-PIV (particle image velocimetry). The microfluidic experiments are complemented by numerical flow simulations. Both visualize unsteady flow, small eddies, and recirculation bubbles behind the natural dermal denticles.",
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Dermal Denticles of Three Slowly Swimming Shark Species: Microscopy and Flow Visualization. / Feld, Katrine ; Kolborg, Anne Noer; Nyborg, Camilla Marie; Salewski, Mirko; Steffensen, John Fleng; Berg-Sørensen, Kirstine.

In: Biomimetics, Vol. 4, No. 2, 38, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Dermal Denticles of Three Slowly Swimming Shark Species: Microscopy and Flow Visualization

AU - Feld, Katrine

AU - Kolborg, Anne Noer

AU - Nyborg, Camilla Marie

AU - Salewski, Mirko

AU - Steffensen, John Fleng

AU - Berg-Sørensen, Kirstine

PY - 2019

Y1 - 2019

N2 - Shark skin has for many years inspired engineers to produce biomimetic structures reducing surface drag or acting as an anti-fouling layer. Both effects are presumed to be consequences of the structure of shark skin that is composed of arrays of so-called dermal denticles. However, the understanding of the full functional role of the dermal denticles is still a topic of research. We report optical microscopy and scanning electron microscopy of dermal denticles from three slowly swimming shark species for which the functional role of the dermal denticles is suggested as one of defense (possibly understood as anti-fouling) and/or abrasion strength. The three species are Greenland shark (Somnosius microcephalus), small-spotted catshark (Scyliorhinus canicula) and spiny dogfish (Squalus acanthias). Samples were taken at over 30 different positions on the bodies of the sharks. In addition, we demonstrate that the flow pattern near natural shark skin can be measured by micro-PIV (particle image velocimetry). The microfluidic experiments are complemented by numerical flow simulations. Both visualize unsteady flow, small eddies, and recirculation bubbles behind the natural dermal denticles.

AB - Shark skin has for many years inspired engineers to produce biomimetic structures reducing surface drag or acting as an anti-fouling layer. Both effects are presumed to be consequences of the structure of shark skin that is composed of arrays of so-called dermal denticles. However, the understanding of the full functional role of the dermal denticles is still a topic of research. We report optical microscopy and scanning electron microscopy of dermal denticles from three slowly swimming shark species for which the functional role of the dermal denticles is suggested as one of defense (possibly understood as anti-fouling) and/or abrasion strength. The three species are Greenland shark (Somnosius microcephalus), small-spotted catshark (Scyliorhinus canicula) and spiny dogfish (Squalus acanthias). Samples were taken at over 30 different positions on the bodies of the sharks. In addition, we demonstrate that the flow pattern near natural shark skin can be measured by micro-PIV (particle image velocimetry). The microfluidic experiments are complemented by numerical flow simulations. Both visualize unsteady flow, small eddies, and recirculation bubbles behind the natural dermal denticles.

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