The discharge coefficients of critical Venturi nozzles were measured for and on the Reynolds number range from to The results showed that the measured discharge coefficients for both gases were about 2 percent larger than the theoretical estimation based on the assumption of isentropic flow of a perfect gas and this large deviation could not be reduced even by introducing real gas effects. The experimental results also showed that the large deviation for could be explained through the assumption of a nonequilibrium flow at the throat. On the other hand, the reason of the deviation observed for has not been clear yet, but one possible explanation would be the inadequate estimation of the boundary layer at the throat because the theory is based on the laminar boundary layer of a perfect gas. [S0098-2202(00)02004-6]
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December 2000
Technical Papers
Discharge Coefficients of Critical Venturi Nozzles for and
Shin-ichi Nakao, Senior Research Scientist,,
e-mail: nakao@nrlm.go.jp
Shin-ichi Nakao, Senior Research Scientist,
Flow Measurement Section, National Research Laboratory of Metrology, 1-4, Umezono-1, Tsukuba, Ibaraki, Japan
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Masaki Takamoto, Group Leader
e-mail: takamoto@nrlm.go.jp
Masaki Takamoto, Group Leader
Flow Measurement Section, National Research Laboratory of Metrology, 1-4, Umezono-1, Tsukuba, Ibaraki, Japan
Search for other works by this author on:
Shin-ichi Nakao, Senior Research Scientist,
Flow Measurement Section, National Research Laboratory of Metrology, 1-4, Umezono-1, Tsukuba, Ibaraki, Japan
e-mail: nakao@nrlm.go.jp
Masaki Takamoto, Group Leader
Flow Measurement Section, National Research Laboratory of Metrology, 1-4, Umezono-1, Tsukuba, Ibaraki, Japan
e-mail: takamoto@nrlm.go.jp
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division January 10, 2000; revised manuscript received August 17, 2000. Associate Technical Editor: P. Bearman.
J. Fluids Eng. Dec 2000, 122(4): 730-734 (5 pages)
Published Online: August 17, 2000
Article history
Received:
January 10, 2000
Revised:
August 17, 2000
Citation
Nakao, S., and Takamoto, M. (August 17, 2000). "Discharge Coefficients of Critical Venturi Nozzles for and ." ASME. J. Fluids Eng. December 2000; 122(4): 730–734. https://doi.org/10.1115/1.1319500
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