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Title: Installation Effects Of A Compact Nozzle Array With Two And Four Elbows
Author: Fong-Ruey Yang, Jiunn-Haur Shaw, Wen-Bin Wang
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: This paper describes the investigation of the Cd deviation between the actual and the theoretical compact nozzle Cd due to different kinds of piping configurations. The compact nozzle array consists of thirteen single nozzles. Each nozzle has actual volumetric flow rate of 40 m3/h and was calibrated individually by the primary nozzle based on the ISO 9300 pipe configuration (designated as reference case A). Other piping configurations for the nozzle array constitute a straight pipe with flow conditioners (case B), two and four elbows (cases C & D), respectively. To avoid the interference effect between nozzles, the distance between neighboring nozzles was placed following the requirements of Park 1 and Stevens 2. In case A, except for one nozzle, all other Cd values lay within a band of f0.2/0 1S0 9300 curve. In case B, deviation of C. varies from 0% to -0.3%, when actual volumetric flow rate was raised from 40 m3/h to 520 m31h. Deviations of Cd for cases C & D were less serious. However, the data had a similar trend as that in case B, with the ed deviation changing from 0.05/0 to -O.12/0. The expanded uncetiainties of these Cd deviation were O.155/0 at 95/0 confidence level. The reason for the strong shifl of Cd as observed in case B is not clear but may attribute to difference in temperature measurement of the in-coming flow. Thus, firther study will focus on the interaction of asymmetric flow field with the temperature probe to resolve the phenomenon observed in the present research. It is believed that for accurate flow measurements, the discharge coefficient Cd of a compact nozzle array would best not be taken directly from single nozzle data.




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