From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Experiment regarding the flow of liquids through orifices and the formulas for calculation.
| Identifier | ExFiles\Box 36\1\ scan 012 | |
| Date | 18th February 1916 | |
| R.R. 326 a (400 T) (S.C. 536. 18-2-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1446. COPY. To EFC. from E.{Mr Elliott - Chief Engineer} E2/B16217 X.2907 - EXPERIMENT RE FLOW OF LIQUIDS. With referrence to the above, your memo KFC5/T9217 seems to imply that we think the flow of liquids through orifices varies as (area)2 / perimeter whereas I distinctly stated in my memo E1/B30117 that "we have always thought that the basis of comparison lay between the above expression and just the simple cross sectional area." The reason for the last statement was a practical one - that we do deal usually with a theoretical orifice having no length. The openings in the R.R.C.H. variable jet are about five diameters long. It would appear that the ratio of length to diameter must be greater than five before any marked deviation from comparison by area occurs. Starting with a straight line for flow plotted against cross sectional area, it might be interesting to see a series of curves giving the effect of increasing ratio of length / diameter. E.{Mr Elliott - Chief Engineer} | ||