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Experimental and Theoretical Analysis of Discharge Coefficient of Throat Tap Nozzle Based on PTC 6 for Wide Range Reynolds Number

[+] Author Affiliations
Noriyuki Furuichi, Kar-Hooi Cheong, Yoshiya Terao

AIST, NMIJ, Tsukuba, Ibaraki, Japan

Shinichi Nakao

Flow Col, Yokohama, Kanagawa, Japan

Keiji Fujita, Kazuo Shibuya

Flow Engineering, Yokohama, Kanagawa, Japan

Paper No. FEDSM2013-16154, pp. V01CT18A003; 9 pages
  • ASME 2013 Fluids Engineering Division Summer Meeting
  • Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives
  • Incline Village, Nevada, USA, July 7–11, 2013
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5556-0
  • Copyright © 2013 by ASME


Throat tap nozzle of ASME PTC 6 is widely used in engineering fields, and its discharge coefficient is normally estimated by an extrapolation in Reynolds number range higher than the order of 107. The purpose of this paper is to propose a new relationship of the discharge coefficient of the throat tap nozzle and Reynolds number that can be applied to Reynolds number up to 1.5×107 by a detailed analysis of the experimental data and the theoretical models. The discharge coefficients are measured for several tap diameters in Reynolds number range from 2.4×105 to 1.4×107 using the high Reynolds number calibration rig in NMIJ. Experimental results show that the discharge coefficients depend on the tap diameter and the deviation between the experimental results and the reference curve of PTC 6 is 0.75% at maximum. New equations to estimate the discharge coefficient are developed based on the experimental results and the theoretical equations including the tap effects. The developed equations estimate the discharge coefficient of the present experimental data within 0.21%, and they are expected to estimate more accurately the discharge coefficient of the throat tap nozzle of PTC 6 in comparison with the reference curve of PTC 6.

Copyright © 2013 by ASME



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