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Math Help - reynolds number

  1. #1
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    reynolds number

    i know that in a pipe that Re = ud/v

    but how can u calculate the reynolds number for a particle moving in air.

    eg. a spherical balloon of diameter d rising through air (density P) at a velocity u?

    could anyone please answer this question.
    thanks!
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by khalid46 View Post
    i know that in a pipe that Re = ud/v

    but how can u calculate the reynolds number for a particle moving in air.

    eg. a spherical balloon of diameter d rising through air (density P) at a velocity u?

    could anyone please answer this question.
    thanks!
    In exactly the same way the charateristic length of the baloon is its diameter
    so:

    Re = ud/v

    See here.

    RonL
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  3. #3
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    thanks mate
    much appreciated

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