An experimental investigation of single and multiple jets in a coflowing ambient fluid was conducted. The experimental data of single coflowing jet in the transition and weak jet zone was used to compare three approaches to estimate where the ambient turbulence begins to change the jet structure. The results show the strong influence induced by ambient turbulence begins at U_e/U_infinity [almost equal to] 0.6, which is consistent with the value estimated by using Knudsen's spread function combined with Wright's approach....[ Read more ]

An experimental investigation of single and multiple jets in a coflowing ambient fluid was conducted. The experimental data of single coflowing jet in the transition and weak jet zone was used to compare three approaches to estimate where the ambient turbulence begins to change the jet structure. The results show the strong influence induced by ambient turbulence begins at U_e/U_infinity [almost equal to] 0.6, which is consistent with the value estimated by using Knudsen's spread function combined with Wright's approach.

The major objective of this investigation was to study the behavior of the merging of multiple jets in a coflowing ambient fluid. The experimental results were compared with a numerical model PJCMERG which was developed by Davidson [ 1989] for solving merging coflowing jets problem. The results show the model gives satisfactory solutions in all of the three regions (axisymmetric, merging and two-dimensional) for the cases considered in this investigation. The additive and self-similar assumptions of velocity and concentration distributions are correct. The results also indicate the I_p*/I_sw3* ratio governs the behavior of the merging jets in a coflowing ambient fluid and can be used as the characteristic parameter of the problem.