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121.
Gerhard H. Jirka 《Environmental Fluid Mechanics》2006,6(1):43-100
An integral model for the plane buoyant jet dynamics resulting from the interaction of multiple buoyant jet effluxes spaced
along a diffuser line is considered as an extension of the round jet formulation that was proposed in Part I. The receiving
fluid is given by an unbounded ambient environment with uniform density or stable density stratification and under stagnant
or steady sheared current conditions. Applications for this situation are primarily for submerged multiport diffusers for
discharges of liquid effluents into ambient water bodies, but also for multiple cooling tower plumes and building air-conditioning.
The CorJet model formulation describes the conservation of mass, momentum, buoyancy and scalar quantities in the turbulent
jet flow in the plane jet geometry. It employs an entrainment closure approach that distinguishes between the separate contributions
of transverse shear and of internal instability mechanisms, and contains a quadratic law turbulent pressure force mechanism.
But the model formulation also includes several significant three-dimensional effects that distinguish actual diffuser installations
in the water environment. These relate to local merging processes from the individual multiple jets, to overall finite length
effects affecting the plume geometry, and to bottom proximity effects given by a “leakage factor” that measures the combined
affect of port height and spacing in allowing the ambient flow to pass through the diffuser line in order to provide sufficient
entrainment flow for the mixing downstream from the diffuser. The model is validated in several stages: First, comparison
with experimental data for the asymptotic, self-similar stages of plane buoyant jet flows, i.e. the plane pure jet, the pure
plume, the pure wake, the advected line puff, and the advected line thermal, support the choice of the turbulent closure coefficients
contained in the entrainment formulation. Second, comparison with data for many types of non-equilibrium flows with a plane
geometry support the proposed functional form of the entrainment relationship, and also the role of the pressure force in
the jet deflection dynamics. Third, the observed behavior of the merging process from different types of multiport diffuser
discharges in both stagnant and flowing ambient conditions and with stratification appears well predicted with the CorJet
formulation. Fourth, a number of spatial limits of applicability, relating to terminal layer formation in stratification or
transition to passive diffusion in a turbulent ambient shear flow, have been proposed. In sum, the CorJet integral model appears
to provide a mechanistically sound, accurate and reliable representation of complex buoyant jet mixing processes, provided
the condition of an unbounded receiving fluid is satisfied. 相似文献
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