Conclusions
Despite the large working gaps of the annular and focusing nozzles, it is not recommended to use them in contactless pneumatic process-testing instruments, owing to their obliteration. Preference should be given to ejector nozzles which have larger working gaps than the plain ones and like them are not subject to obliteration.
Additional information
Translated from Izmeritel'naya Tekhnika, No. 4, pp. 90–91, April, 1971.
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Glukhov, V.I., Typolev, A.A. Obliteration of nozzles in pneumatic contactless measurements. Meas Tech 14, 660–661 (1971). https://doi.org/10.1007/BF00980191
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DOI: https://doi.org/10.1007/BF00980191