Small Nozzles and Low Values of Diameter Ratio

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Abstract
In 1943 the National Bureau of Standards calibrated ten sets of nozzles for the Heat Exchange Institute, using adapters originally intended for open-inlet or discharge conditions, in a modified arrangement for in-line measurements. These calibrations were made with air. Since then, new adapters have been prepared to facilitate using them in the “in-line” manner. Two sets of the nozzles have been recalibrated using these new adapters and a weighed-water procedure. The results of these new calibrations are presented and a comparison made with the earlier results. For most of the nozzles, the agreement between the original air calibrations and the recent water calibrations is well within the range of experimental uncertainties.

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