Abstract
This chapter presents numerical and experimental study of turbulent processes and mixing in jet mixers. Various jet mixers are applied in many engineering devices, such as combustion chambers and injection systems. In this study, velocity and passive scalar fields in a co-axial jet mixer are investigated both experimentally (LIF and LDA) and numerically (LES) in a single phase incompressible flow at different flow rate ratios, flow densities, Reynolds numbers, and temperatures. The classical jet mixer consisting of a nozzle of diameter d which is coaxial arranged in a pipe of diameter D is used. Two flow regimes with and without recirculation zone are considered. The flow in the recirculation zone is unsteady and contains coherent vortex structures which enhance sufficiently the mixing of scalars. Different SGS closure models are tested by comparing with experimental data. The best results are achieved using the dynamic mixed model. The experimental and numerical investigations show that the mixing is mostly influenced by the flow rate ratio.
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