Results of experimental investigations of the effects of distortion caused by coil inserts on a turbulent jet are presented. The coils have different wire diameters with constant pitch spacing. The ratios of the coil wire diameter to the tube inside diameter, are 0.06, 0.08, 0.11, 0.13, and 0.16 and the ratio of the pitch spacing to the tube inside diameter, is 1.2. Results show that the coil inserts enhance the mixing process. At the jet-outlet, mixing enhancement is increased when However, further downstream, the highest mixing is achieved for the coil with the largest ratio. Results suggest that the streamwise vortices generated by the coil inserts are the mechanism behind the high entrainments and the mixing process.
The Distortion of a Jet by Coil Inserts
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division March 21, 2001; revised manuscript received December 17, 2001. Associate Editor: K. Zaman.
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Hoang, H. T., and Rahai, H. R. (May 28, 2002). "The Distortion of a Jet by Coil Inserts ." ASME. J. Fluids Eng. June 2002; 124(2): 500–504. https://doi.org/10.1115/1.1470476
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