Aflat plate maintained at a temperature of 80°c experiences a flow of atmospheric air at 0°c. if the temperature gradient at the plate's surface at a given downstream-stream location is 43°c/mm, what is the local heat transfer coefficient?

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?