Theory 16/Sherwood Number/Leaf transpiration
Transpiration Is a Boundary Transfer
The claim
Leaf transpiration is set by a Sherwood-like number for the leaf boundary layer, so wind changes water loss only until the boundary layer thins enough that stomata take over.
01Mechanism
Water vapour must cross the boundary layer and the stomatal pore in series; the ratio determines which resistance dominates.
02Prediction
Transpiration should saturate once boundary resistance is small.
03Refutation
Transpiration scaling with wind indefinitely would remove the stomatal limit.