1. Subscriberjoe shmo
    Strange Egg
    podunk, PA
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    10 Dec '06
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    7733
    12 Nov '11 04:46
    For fluid flow over a rectangular flat plate, is it valid if h = h(x), where "x" is the length from the leading edge of the plate?

    if we start with

    dq = h*(T-T_amb)dA

    where

    dA = w*dx (w is the width of the plate)

    T= T(x)

    h=h(x)

    q = w*Int(x,0){ h(x)( T(x) - T_amb )*dx

    I seem to get pretty wacky results using this method.
  2. Joined
    26 Apr '03
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    25822
    15 Nov '11 07:24
    I had to wiki it to understand your question.

    Newtons law:
    dq/dt = h.A(Tenv - T(t))

    Where:
    q is the thermal energy in joules
    h is the heat transfer coefficient
    Tenv is the temperature of the environment
    T(t) is the object temperature at a given time
  3. Subscribertalzamir
    Art, not a Toil
    60.13N / 25.01E
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    15 Nov '11 10:13
    Are these two even equivalent, one being a rate of change of the thermal energy in terms of time, the other in terms of area..?
  4. Subscriberjoe shmo
    Strange Egg
    podunk, PA
    Joined
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    15 Nov '11 13:40
    Originally posted by talzamir
    Are these two even equivalent, one being a rate of change of the thermal energy in terms of time, the other in terms of area..?
    Yeah, they are equivalent. I would have changed the variable in the time rate to "Q" to clarify, but he has the terms defined correctly
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