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Surface tension

  1. May 21, 2012 #1
    1. The problem statement, all variables and given/known data
    Trough a capillary with an inner radius r=1mm water flows in a form of small spherical droplets. What is the radius of the drops, the number of drops in m=10g water and the time needed the water to expire, if the surface tension of the water is =72x10^-3N/m, and the period between two drops is t=2s.


    2. Relevant equations



    3. The attempt at a solution
    I need an idea how to imagine the situation and what to take into consideration? Help please :/
     
  2. jcsd
  3. May 21, 2012 #2
    I tried something:
    When the drop is at the end of the tube just before to fall
    αl1+αl2=m0g
    where m0 is the mass of one drop
    2απr+2απR=m0g
    R=m0g2απr/2απ
    V0=4R3π/3
    m0=ρV0
    m0=4ρR3π/3
    N=m/m0
    N=3m/4ρR3π
    τ=t3m/4ρR3π
    t=2s
     
    Last edited: May 21, 2012
  4. May 21, 2012 #3
    Here is how I imagined it.
     

    Attached Files:

  5. May 21, 2012 #4
    Can anybody tell me if it is correct please?
     
  6. May 21, 2012 #5
    You could've just used the edit button instead of posting 4 times on this thread that you pretty much just started.
     
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