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  1. phosty

    Determining Isentropic Expansion Coefficient

    I have a copy of: Shackelford, Aubry, "Using the Ideal Gas Specific Heat Ratio for Relief Valve Sizing", Chemical Engineering, pp. 54-59, November 2003. I am struggling to understand how, in the first worked example he presents (Case I), the isentropic expansion coefficient (n) of 0.746 is...
  2. phosty

    Ratio of wetted perimeter to partial volume/area

    You are correct but I am making some simplifying assumptions - immediately prior to blowdown, ESD valves will close. Therefore there will be no flow and the static mix of gas/liq will approximate to the ratio of the volumetric flowrates prior to ESD closure, with the wetted areas calculated as...
  3. phosty

    Ratio of wetted perimeter to partial volume/area

    25362, many thanks for your reply. I actually already had these formulas - the problem is solving the first equation for theta so that one can then determine the perimeter. I did not know how to rearrange for theta=????. The problem I am trying to solve is this: knowing the volumetric flows...
  4. phosty

    Ratio of wetted perimeter to partial volume/area

    I am looking for an equation which can relate the ratio of the wetted perimeter to the partial area (WP:PA) of a horizontal pipe part filled with liquid. I am familiar with the usual partial volume equations and use them regularly however the starting point with these is that you typically know...

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