The size of the smallest scales is set by the Reynolds number.
The higher the Reynolds number, the greater the range of scales.
For low Reynolds number flows, tunnels can be made to run oil instead of water.
But the influence of the Reynolds number is second order relative to other factors.
However, at high Reynolds numbers all experiments showed there is drag.
However, this is probably not the only way in which transition can be initiated at the lower Reynolds numbers.
The critical Reynolds number for this is better defined at (2 1 + 0 3) x 103.
The tendency for each type of flow is described by the Reynolds number.
This idea can work fairly well when the Reynolds number is high.
In many practical situations, the Reynolds number of the flow is quite large.