Action of the Fluid in the Air-Micrometer : 5th Report, Combined Characteristics of Nozzle or Orifice and Double-Disc Nozzle, and Method of Design of Air-Micrometer

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Combining the experimental characteristic formulas of nozzles or orifices and double-disc nozzles which were obtained in the last four reports, characteristic equations were worked out for the low-pressure type and high-pressure type air-micrometers. The values calculated from these characteristic equations are in good agreement with the measured ones and these equations make it possible to calculate accurately the characteristics of air-micrometer in accordance with the types of nozzle or orifice and double-disc nozzle. Using these experimental formulas, some design charts can be prepared and any desired air-micrometer can be readily designed by using these charts.