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What is the impact of having a pipe made of rough material on the flow?

- July 31, 2020 at 1:38 pm
  
  Karthik Remella
  Administrator
  
  Hello Experts,
  What is the impact of having a pipe made of rough material on the flow?
- July 31, 2020 at 1:38 pm
  
  prajput
  Ansys Employee
  
  Hello @Kremella ,
  The flow over a rough wall generally leads to higher levels of friction pressure losses.
- July 31, 2020 at 1:39 pm
  
  Karthik Remella
  Administrator
  
  Thanks for your response @prajput , Is there a way to calculate the friction losses?
- July 31, 2020 at 1:40 pm
  
  prajput
  Ansys Employee
  
  Yes, you can calculate the friction losses using the Darcy-Weisbach equation. The pressure losses are proportional to the length of the pipe and the Darcy-Weisbach friction factor:
  delta_P / L = f_D * (rho / 2) * (V_avg^2 / D )
  where,
  delta_P - pressure drop
  L - pipe length
  f_D - friction factor
  rho - fluid density
  mu - fluid dynamic viscosity
  V_avg - average fluid velocity
  D - pipe diameter
  
  This equation is valid for incompressible flows.

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