Tw 0.632 pU (pUDIµ)"4 1/4

Air at 20⁰c and 1 ATM flows over a flat plate, v= 35 m/s. The plate is 75 cm long and guarded at 60⁰c. Suppose the depth of one Units on Z, count the transfer of Calor from that plate.

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When fluid in a long pipe starts up from rest at a uniformacceleration a , the initial flow is laminar. The flow undergoesa transition to turbulence at a time t * which depends, tofirst approximation, only upon a , ρ , and μ . Experiments by P. J. Lefebvre, on water at 20 8 C starting from rest with 1-gacceleration in a 3-cm-diameter pipe, showed transition att * = 1.02 s. Use this data to estimate ( a ) the transition timeand ( b ) the transition Reynolds number Re D for water flowaccelerating at 35 m/s 2 in a 5-cm-diameter pipe.