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Hydraulic diameter

  1. Mar 20, 2016 #1
    1. The problem statement, all variables and given/known data
    why in 4.4 the author gave D =4Rh? in 4.5, D= 2Rh ?

    2. Relevant equations


    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Mar 20, 2016 #2
    In some developments, the hydraulic radius is defined as the area divided by the wetted perimeter. Get used to the idea.
     
  4. Mar 20, 2016 #3
    why in 4.4 the author gave D =4Rh? in 4.5, D= 2Rh ? can you explain?
     
  5. Mar 20, 2016 #4
    Yes. He is consistent in defining the hydraulic radius as S/Lp, and the equivalent diameter as 4S/Lp. However, in 4.5, he makes the mistake of calling the radius of the cylinder RH. The term in brackets should not have a subscript H. It should just have an R. And, for a cylinder, RH=R/2.
     
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