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Homework Help: Convection over plate (top and bottom)

  1. Jun 8, 2012 #1
    1. The problem statement, all variables and given/known data

    Consider a flat plate subject to parrallel flow (top and bottom) characterized by u = 5 m/s and T = 20°C.

    Determine the average convection heat transfer coefficient and convective heat transfer rate with an L = 2m long and w = 2m wide flat plate for airflow and surface temp Ts = 50°C

    2. Relevant equations

    ReL = V*L/v

    h = Nu*k/L

    3. The attempt at a solution

    My question is what should the L be to calculate the Reynold's number and conventive coefficient. Is it 2m or 4m since fluid flows over the top and bottom?
  2. jcsd
  3. Jun 9, 2012 #2
    The L is measured from one surface so L is 2 m.
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