In this investigation experiment was carried out in 80 mm diameter swirling pipe jet, where swirl was generated by attaching wedge-shaped helixes in the pipe. All measurements were taken at Re 5.3e4. In the plain pipe jet the potential core was found to exist up to x/D=5 but in the swirling jet there was no existence of potential core. The mean velocity profiles were found to be influenced by the presence of wedge-shaped helixes in the pipe. The velocity profiles indicated the presence of sinusoidal flow field in the radial direction existed only in the near field of the jet. This flow field died out after x/D=3 and the existence of jet flow diminished after x/D=5.
O. Kitoh, “Experimental study of turbulent swirling flow in a straight pipe,” Journal of Fluid Mechanics, vol. 225, pp. 445-479, 1991.
P. Orlandi and M. Fatica, “Direct simulations of turbulent flow in a pipe rotating about its axis,” Journal of Fluid Mechanics, vol. 343, pp. 43-72, 1997.
W. P. Jones and A. Pascau, “Calculation of confined swirling flows with second moment closure,” Journal of Fluid Mechanics, vol. 111, pp. 57-63, 1989.
A. Gupto, D. G. Lilley and N. Syred, “Swirl flows,” Abacus Presss, kent, England, 1984.
J. V. Alekseenko, P. A. Kuibin, V. S. Okulov and S. I. Shtork, “Helical vortices in swirl flow,” Journal of Fluid Mechanics, vol. 382, pp. 145-243, 1999.
S. Imao, M. Itoh and T. Harada, “Turbulent characteristics of the flow in an axially rotating pipe flow,” International Journal of Fluid Flow, vol. 17, no. 5, pp. 444-451, 1996.
S. Hirai, T. Takagi and M. Matsumoto, “Prediction of the laminarization phenomena in an axially rotating pipe flow,” Journal of Fluid Mechanics, vol. 110, pp. 424-430, 1988.
M. T. Islam, “Flow characteristics of unexcited and excited circular wedge-shaped jets,” Ph.D. dissertation, Dept. Mecha. Eng., Bangladesh University of Engineering and Technology, Dhaka, Bangladesh, 1995.
M. Pashtrapansha, J. Jovanovic, H. Lienhart and F. Durst, “Turbulent measurements in a swirling pipe flow,” Experiments in Fluids, vol. 41, pp. 813-827, 2006.
Z. D. Kravtsov D. K. Sharaborin and V. M. Dulin, “Swirl effect on flow structure and mixing in a turbulent jet,” Journal of Physics, vol. 980, 2018.
B. Leclaire and L. Jacquin, “On the generation of swirling jets: high Reynolds-number rotating flow in a pipe with a final contraction,” Journal of Fluid Mechanics, vol. 692, pp. 78-111, 2012.
D. W. Bryer and R. C. Pankhurst, “Pressure probe methods for determining wind speed and flow direction,” National Physical Laboratory, London, England, 1971.
B. G. Van Der Hegge, “Measurement of the velocity distribution in a plain turbulent jet of air,” Applied Scientific Research, vol. 7, no. A, pp. 256-276, 1958.
J. F. Floss and J. B. Lones, “Secondary effects in a bounded rectangular jet,” Journal of Basic Engineering, vol. 90, 1968.
R. Sharma and F. Cozzi, “Experimental study of unconfined and confined isothermal swirling jets,” International Journal of Mechanical and Mechatronics Engineering, vol. 11, no.2, pp. 386-396, 2017.
This work is licensed under a Creative Commons Attribution 4.0 International License.
The names and email addresses entered in this journal site will be used exclusively for the stated purposes of this journal and will not be made available for any other purpose or to any other party.
Submission of the manuscript represents that the manuscript has not been published previously and is not considered for publication elsewhere.