Abstract
Results of experimental investigations of the effects of distortion caused by coil inserts on a turbulent jet from a round tube are presented. The coils had constant pitch spacing and wire diameter, but different axial lengths. The ratio of the pitch spacing to the tube inside, p/D, was 1.2 and the ratio of the coils wire diameter to the tube inside diameter, d/D, was 0.06. The ratios of the coil length to the tube inside diameter, L/D, were 22.5, 11.26, 5.64, and 2.82. The experiments were carried out at six axial locations of X/D = 0.1, 1, 3, 5, 10, and 15 and various radial locations. Results show that the coil inserts enhance the mixing process between the jet and the surrounding air. For X/D > 5, the highest mixing is obtained with the coil with L/D = 2.82. It is conjectured that the enhanced mixing is due to generation of the stream wise vortices by the coil insert.
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