Millifluidics, 4. Actual surfaces The effect of the roughness q a q - - PowerPoint PPT Presentation

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Millifluidics, 4. Actual surfaces The effect of the roughness q a q - - PowerPoint PPT Presentation

Aug 24, 2023 44 likes •145 views

Millifluidics, 4. Actual surfaces The effect of the roughness q a q r rough flat wax surface Dettre & Jonhson Super-hydrophobic surfaces 200 m Onda et al. Apparent contact angle Cos q * q * cos q q Onda et al. A textured surface

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SLIDE 1

Millifluidics,

  • 4. Actual surfaces
slide-2
SLIDE 2

The effect of the roughness

Dettre & Jonhson rough flat wax surface

qa qr

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SLIDE 3

Super-hydrophobic surfaces

200 µm

Onda et al.

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SLIDE 4

Apparent contact angle

cosq Cosq*

q* q

Onda et al.

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SLIDE 5

A textured surface

  • C. Marzolin
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SLIDE 6

Effective wetting diagram

cosq cosq* 1 1 - fS

  • 1
  • 1 + fS

r

cosqc

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SLIDE 7
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SLIDE 8

Aphids “pearls”

1 mm

  • N. Pike, D. Richard, W. Foster, L. Mahadevan
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SLIDE 9

Rotating marbles

Pascale Aussillous

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SLIDE 10

Doughnut or peanut ?

Pascale Aussillous