Hydrodynamics and Local Turbulent Mixing of Submerged, Parallel Liquid Jets: Experiments and CFD Simulations

Abstract

The hydrodynamics and local turbulent mixing of parallel multiple liquid jets, submerged in liquid, were investigated by means of experiments and computational fluid dynamics (CFD). A renormalization group (RNG) k-e turbulence model was used to simulate the flow field. The model was validated experimentally by particle image velocimetry (PIV) measurements. In the converging region adjacent to the nozzle exits, the recirculation region disappears, and there is only ambient fluid entrainment. Different jet arrays were compared to evaluate the effects of jet spatial arrangement on the hydrodynamics and mixing performance. A shorter mixing length in the merging region suggests that mixing is more efficient in the triple jet system than in other jet systems. Compared with the jet Reynolds number, the jet spacing plays a more significant role in determining the critical mixing regions, while the linear relationship between them is more sensitive than that for multiple parallel plane jets.

CFD-PBM Investigation on Droplet Size Distribution in a Liquid–Liquid Stirred Tank: Effect of Impeller Type

“…The time difference between laser pulses was set at 2000 μs. According to the statistical reliability test of the selection of the number of image pairs, the influence can be negligible when the number of image pairs is above 500 . Therefore, a total of 500 image pairs were captured for the different impeller geometrical configurations.…”

“…According to the statistical reliability test of the selection of the number of image pairs, the influence can be negligible when the number of image pairs is above 500. 35 Therefore, a total of 500 image pairs were captured for the different impeller geometrical configurations. The PIV experiments and the 500 pairs were carried out to obtain a time-averaged flow field, not for instantaneous flow field.…”

I&EC Research Special Issue on Fluidic Devices without Moving Parts

“…Some applications not envisaged at the time of the call are also seen (for example, a cook stove as a fluidic device without any moving parts). The contributions in this special issue may be broadly classified into four groups: Microfluidics/microreactors − Coils, curved channels, and inserts − Specialized fluidic devices − Other − …”