Athin plate is located midway between two fixed parallel plates. the 10-mm gap between the fixed plates contains sae 30 oil. what is the area of the plate if it moves at a velocity of 2 m/s when a force of 10 n is applied on it?

Afan that can provide air speeds up to 60 m/s is to be used in a low-speed wind tunnel with atmospheric air at 35 c. if one wishes to use the wind tunnel to study flat-plate boundary layer behavior up to reynolds numbes of re 10, what is the minimum plate length that should be used? at what distance from the leading edge would transition occur if the critical reynolds nurnber were rer,e = 5 × 105?