Fluids

Fluids

Pipe losses

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    • prajput
      Ansys Employee
      I have a pipe of diameter D. The flow enters into the pipe from a large reservoir. I am using correlations based on fully developed pipe profile to estimate losses, but I am not getting correct answer. Do you know why?
    • Keyur Kanade
      Ansys Employee

      Hello @prajput

      All internal flows have a characteristic variable called the Hydrodynamic entrance length. It is defined as the length from the entrance of a pipe (internal flow) required to achieve a fully-developed flow profile. For laminar flows in circular tubes, the fully developed flow profile is parabolic. For turbulent flows, this is flatter due to turbulent mixing in the radial direction.

      Fully developed pipe flow profiles are valid only after the flow becomes fully-developed. Since, you are not considering the entrance length in your calculations, you are getting a wrong estimate of the losses. 

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