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A fan that can provide air speeds up to 50 m/s is to be used in a low-speed wind tunnel with atmospheric air at 25°C. If one wishes to use the wind tunnel to study flat-plate boundary layer behaviour up to Reynolds numbers of Rex = 10^8 , what is the minimum plate length that should be used? At what distance from the leading edge would transition occur if the critical Reynolds number were Rex, c = 5x10^5?
Q1) Heat transfer across a finite ΔT is a source of irreversibility. Why is this? Give 2 examples of other sources of irreversibility.
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