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Homework Help: Characteristic Length

  1. Jul 26, 2015 #1
    1. The problem statement, all variables and given/known data
    Hello. This should be rather easy. I am trying to figure out what the Characteristic length I should use in calculating the grashof number for a greenhouse. The dimensions given for the greenhouse are 1.5 m wide x 2 m long and 2 m high. What characteristic length should I choose? Is it vertical plate, horizontal plate? I am lost.

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Jul 26, 2015 #2

    mfb

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    2017 Award

    Staff: Mentor

    That shouldn't matter, as you make a rough approximation only. A better analysis would have to take the different dimensions into account separately. Just pick some length you like, the three are very similar anyway.
     
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