An Opposed Jet, Process Flow Geometry: Three-Dimensional Experimental Results and Simulation for Verification
Creators:Brodkey, Robert S.
Keywords:transitional and turbulent flow
Particle Tracking Velocimetry (PTV)
DNS and LES numerical simulation
validation of experimental results
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Publisher:Ohio State University
Experiments and computations were made using an opposed jet mixer. The experiments provided time-resolved, fully 3-dimensional velocity vector data of low resolution. Initial velocities for the computation were all zero. The computational inlet profiles were a parabolic distribution for laminar flow, 1/7th power law for the turbulent profile, or plug flow. Two time zones were observed: the first from the start-up jet flow to fully turbulent conditions and the second, the fully turbulent (pseudo-steady-state) conditions. The initial part (available for the computations) had the most interesting fluid dynamics. The laminar inlet is different than the others. The fully turbulent flow was further divided into primary or jets, secondary or pancake, and tertiary regions of low velocity. The long times needed to obtain an average in interacting jet flows are caused by low frequency flapping of the jets. The final comparisons between experiments and computations were within a factor of two.