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  1. kflee0

    Involute Spline

    What's the major differences between involute spline angle 30deg, 37.5deg and 45deg PA in terms of torque capacity, ease of installation, fit, etc. Also what is the playing role of Number of teeth in the above selection. What i am trying to figure out is I have a 1.69" shaft that need...
  2. kflee0

    Speed Torque Curve

    Thank you all for your help.
  3. kflee0

    Speed Torque Curve

    As a pump engineer, I always asked to provide pump speed torque curve to the motor guy but I never know the real reason behind. I figure it must have something to do with motor at start-up, when the pump shaft gets hammered by a large amount of starting torque. I guess my question is how do...
  4. kflee0

    Local Rotating Region Issues

    In order to use the local rotating region, I believe one have to create a separate rotational domain to enclose the intended rotating part. Does the rotational domain need to be a solid inside part or hollow inside part to enclose the intended rotating part????? I used hollow inside part for...
  5. kflee0

    Cosmosfloworks Memory Issues

    I tried to run Internal fluid flow on my laptop(Intel Pentium M 1.80GHz, 1.25GB Memory, Microsoft XP operating system) Below are the mesh setting Disabled Automatic setting Disabled Narrow Channels, Small solid refinement-Level 3 Curvature refinement -Level 3 Tolerance refinement -Level 0...
  6. kflee0

    Variation between Alpha 3 to Alpha 4 in Radial/ Mixed flow Diffuser

    Dear members, I have some question about the alpha variation. For standard good design, is the variation from alpha3 to alpha4(90degree) going to be linear variation or polynomial?. If either method can be used, how does each method affect the pump curve chracteristic? i am so interested to...
  7. kflee0

    Inlet and outlet of Meridional Velocity on radial impeller design

    Vanstoja, thank you so much for your explanation. So, beta 2 does not have to be necessarily larger than beta1? Would you mind explain how beta 2 depends on number of blazes and b2 ?? it interest me coz I remember reading this somewhere," the BEP and Q can be maintained by increasing b2...
  8. kflee0

    Inlet and outlet of Meridional Velocity on radial impeller design

    I have two pump books telling two different story about Cm1 and Cm2. First version said that Cm2 is equal or slightly less than Cm1. Is this statement correct? I highly suspect that this statement is true. Second book said Cm2=Km(2gh)^0.5, if I use this formula, my Cm2 is much much less than...
  9. kflee0

    Radial flow and Mix flow diffuser vane layout design

    Hi, I am a centrifugal pump product engineer. I've been doing some self study in hydraulic design on and off as my interest. Can someone point me in the right direction what pump book that specifically show you how to design a radial flow type diffuser particularly Vane Layout?? I have some...

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