Experimental and Numerical Evaluation and Optimization of a Non Standard Pitot/Sampling Probe


An isokinetic sampling probe is designed and constructed to measure entrained liquid droplet fluxes in separated gasliquid pipe flows. This probe also has the capability of working as a non-standard Pitot tube when the sampling is stopped. CFD simulations using the commercial software Ansys CFX were carried out for single phase gas flow to analyze the non-standard design. Pitot tube velocity calculations and isokinetic sampling conditions were studied. The predicted results were compared against theoretical velocity profiles from the literature and with gas single phase experimental data acquired in a horizontal 49 m long steel pipeline with an internal diameter of 69 mm. The experiments were done by using a dense gas (SF6) at 7 bara. An asymmetry of the experimental velocity profiles reproduced with the numerical simulations. The CFD simulations made it possible to verify the design and predict and correct an installation problem.

Share and Cite:

Shmueli, A. , Unander, T. and Nydal, O. (2013) Experimental and Numerical Evaluation and Optimization of a Non Standard Pitot/Sampling Probe. Engineering, 5, 967-974. doi: 10.4236/eng.2013.512118.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] L. A. Dykhno, “Maps of Mean Gas Velocity for Stratified Flows with and without Atomization,” International Journal of Multiphase Flow, Vol. 20, No. 4, 1994, pp 691-702.
[2] F. M. White, “Fluid Mechanics,” 4th Edition, McGrawHill, New York, 1999.
[3] D. Tayebi, S. Nuland and P. Fuchs, “Droplet Transport in Oil/Gas and Water/Gas at High Densities,” International Journal of Multiphase Flow, Vol. 26. 2000, pp. 741-761.
[4] R. Skartlien, S. Nuland and J. Amundsen, “Simultaneous Entrainment of Oil and Water Droplets in High Reynolds Number Gas Turbulence in Horizontal Pipe Flow,” International Journal of Multiphase Flow, Vol. 37 2011, pp. 1282-1293.
[5] G. Falcone, F. Hewitt and C. Alimonti, “Multiphase Flow Metering: Principles and Applications,” Elsevier, Amsterdam, 2009.
[6] R. C. Baker, “Flow Measurement Handbook: Industrial Designs, Operating Principles, Performance and Applications,” Cambridge University Press, New York, 2000.
[7] M. Wicks and A. E. Dukler, “Entrainment and Pressure Drop in Concurrent Gas-Liquid Flow: Air-Water in Horizontal Flow,” American Institute of Chemical Engineers, Vol. 6, No. 10, 1960, pp. 463-468.
[8] L. Williams, “Effect of Pipe Diameter on Horizontal Annular Two-Phase Flow,” PhD Thesis, University of Illinois at Urbana-Champaign, 1990.
[9] G. Kocamustafaogullari, S. R. Smits and J. Razi, “Maximum and Mean Droplet Sizes in Annular Two-Phase Flow,” International Journal of Heat and Mass Transfer, Vol. 37, No. 6, 1994, pp. 955-965.
[10] J. Kubie and G. C. Gardner, “Drop Sizes and Drop Dispersion in Straight Horizontal Tubes and Helical Coils,” Chemical Engineering Science, Vol. 32, No. 2, 1977, pp. 195-202.
[11] N. Afzal, A. Seena and A. Bushra, “Power Law Velocity Profile in Fully Developed Turbulent Pipe and Channel Flows,” Journal of Hydraulic Engineering, Vol. 133, No. 9, 2007, pp. 1080-1086.
[12] W. J. Duncan, A. B. Thorn and A. D. Young, “Mechanics of Fluids,” ELBS Edward Arnold, 1967.
[13] J. Guo and P. Juliem, “Modified Log-Wake Law for Turbulent Flow in Smooth Pipes,” Journal of Hydraulic Research, Vol. 41, No. 4, 2003, pp. 493-501.
[14] ISO, “Measurement of Fluid Flow in Closed ConduitsVelocity Area Method Using Pitot Static Tubes,” ISO 3966, 1977, pp. 146-183.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.