Fluids

Fluids

DPM Cumulative Size Distribution of Particles-Rosin-Rammler

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    • ll00023
      Subscriber

      In a common sense, cumulative size distribution should be increasing with the variable. but Fluent chooses the other way round; count-intuitive. why Fluent chooses this way to present it? Thank you.

    • Rob
      Ansys Employee

      The distribution is particles bigger than or particles smaller than. Whoever worked out the equations for the original model was probably taught the "other way" to yourself so did it that way. For a cascade impactor, if I weigh each tray I get a mass, logically I see zero powder on the tray with the largest holes, so 100% of mass is under that size. I don't know the size of the smallest particles as they get through all of the trays, so any mass missing must be under the size of the holes in the smallest tray. 

    • ll00023
      Subscriber

      So the approach FLUENT adopted is consistent with a cascade impactor. Thank you Bob. 

    • Rob
      Ansys Employee

      Possibly. You're looking at data that can be "as presented", or 1-"as presented". Either works: I just vaguely remember reviewing Anderson data for a project. 

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