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Title: The Application Of Critical Nozzles In Series For The Determination Of Small Flow Rates And The Generation Of Gas Mixtures
Author: Rainer Kramer, Bodo Mickan, Roland Schmidt
Source: Flomeko 2010
Year Published: 2010
Abstract: Because of the low uncertainty and very good long term stability the application of critical nozzles became very important especially for test rigs. The majority of nozzles are used in the so-called suck mode using atmospheric air as test medium. In order to use nozzles for the generation of different flow rates as well as to generate gas flows with different kinds of gases the application with increased input pressure became more important. An other field of extended application is the usage for small flow rates. Nozzles which have a shape in accordance to ISO 9300 are available with throat diameters down to 80 m. Below this value the shapes have to be simplified. Even for simplified shapes the mechanical manufacturing of nozzles allows at the time being throat diameters of d 15 m

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