Liquid mixing intensification by adding swirling flow in the transverse
jet mixer
Abstract
In this study, effect of swirling addition on the liquid mixing behavior
of multi-orifice-impinging transverse jet mixer has been investigated by
planar laser induced fluorescence as well as large eddy simulation
(LES). In the case of swirling addition into the jet flow, there exists
an optimized swirling jet angle or optimized jet-to-cross velocity ratio
for the fixed mixer configuration. A larger swirling jet angle will make
the flow dominated by the swirling, resulting in a slower mixing
process. Interaction of swirling crossflow with no-swirling injected
streams, or with swirling injected streams in the opposite direction is
beneficial for the mixing. LES predictions show that many small vortices
are produced homogenously due to intensified impingement in the case of
opposite swirling directions, leading to a relative fast mixing process
in several milliseconds. Whereas the mixing is restrained when the
swirling directions of two flows are the same.