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Natural Convection _ Beta is Zero ?

  1. Feb 24, 2010 #1
    Natural Convection _ Beta is Zero ?!!!!!!!!!!!!!!!!!!

    Suppose we have a horizontal plate @ 0 'C and our environment is @ 8 'C. for calculating natural heat convection we should find Gr number @ film temperature i.e. (8+0)/2=4 'C. But @ this temperature (4 'C), Volumetric Expansion Coefficient (beta) is Zero??!!!!!!!!
    any idea???????????????????????????????????????????????????????????????????
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  2. jcsd
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