Theory 29/Biomimetics
Fog Harvesting Is Bump Spacing
The claim
Water capture by a fog-harvesting beetle is set by the ratio of bump spacing to droplet size, so a surface tuned to one droplet spectrum captures poorly in another.
01Mechanism
Droplets nucleate on hydrophilic bumps and coalesce until they run down hydrophobic channels; the ratio determines whether droplets reach critical size before the wind removes them.
02Predictions
- P1Capture should peak at a spacing ratio.
- P2Surface chemistry alone should mispredict.
03Refutation
Capture increasing with bump density would remove the droplet-size term.
04Why it resists the grid
It is a physical effect that is also an adaptation, and the animal's behaviour of facing the wind is part of the mechanism.