Recent content by jamespb

  1. J

    Which Surface Roughness value to use for pipe flow friction factor

    I am trying to predict pressure drop in a pipeline with a range of different materials. I have used a surface profilometer to measure the surface roughness of the different materials and I have values for various surface roughness variables - Ra Rz Rmax Rq Rm S Sm R3z Wt and a range of other...
  2. J

    Which roughness value (Rz, Ra, ) to use in pipe flow equations

    Hi, I am struggling with the same issue as original poster WouterWouter, I have used a surface profilometer to measure the roughness of a range of materials, but now have no idea which measurable to use (I know Ra Rz Rmax Rq Rm S Sm R3z Wt and a bunch of other variables - but no idea which...