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I Force to move grease

  1. Nov 30, 2017 #1
    Good day. My question is as follows, I have a column of white lithium grease 1/4” diameter 24’ long. I want to figure out the pressure needed to move this column of grease. I am having a hard time to find the right formula to calculate this so any help will be greatly appreciated. Thank you.
     
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  3. Nov 30, 2017 #2

    phinds

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    What factors have you identified that will have an effect on the answer?
     
  4. Nov 30, 2017 #3
    I’m not sure what you mean? I’m guessing the friction along the walls of the column and sticky ness of the grease would come into play.
     
  5. Nov 30, 2017 #4

    phinds

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    So you figure the mass of it is irrelevant?
     
  6. Dec 3, 2017 #5
    Is the stuff thixotropic ? ie, when it starts to move, will the core blow out, leaving a significant layer stuck to the tube wall ?

    Also, temperature / viscosity variations. Ambient temperature is one factor. Another may be frictional heating...
     
  7. Dec 3, 2017 #6

    phinds

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    @Tritkoss we have touched on, but not completed, the list of things you will need to know. Do you begin to get the idea that it's not going to be a simple formula? It may well be that many of the possible factors are negligible, but you have to figure that out after you have a complete list.
     
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