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Homework Help: Shear Strain in a Rotational Viscometer Derivation (for Fluid Dynamics)

  1. Mar 25, 2012 #1
    1. The problem statement, all variables and given/known data
    I am curious about how to derive the equation for shear strain on this webpage (http://www.pavementinteractive.org/article/rotational-viscometer/ [Broken]). It is at the bottom, after γ = (etc). I understand the derivation for τ as well as η but need help with the γ (shear strain). Is the HP equation involved here? I think my analysis has been simplifying the process because I am not getting the equation described on the web page.

    2. Relevant equations
    τ=μ (dv/dy)
    τ = F/A
    v = ω x r

    3. The attempt at a solution
    dy/dy = γ = (ωR1)/(R1-R2)
    Last edited by a moderator: May 5, 2017
  2. jcsd
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