The mixing characteristics of a vertical heated jet in a crossflow have been studied in laboratory experiments over a wide range of ambient velocities. Detailed concentration measurements and flow visualization show that jet behaviour for buoyancy-dominated discharges is governed by the dimensionless depth yu:/B, where B is the discharge buoyancy flux, and U, is the ambient current velocity. Both the jet width and dilution increase substantially even in a weak current. The experimental results offer an explanation of a recent correlation of field data of initial dilution at sea outfalls.
Sewage and industrial effluents from coastal cities are often discharged into the adjacent sea after some land-based treatment. In modern design, the wastewater is often discharged in bouyant jet groups from risers mounted on a submarine outfall on the seabed to achieve rapid mixing of effluents with tidal flow. A mathematical model for bouyant jets in currents based on the Lagrangian models, called JETLAG, was developed. This paper presents a system, called VISJET, for visualizing the ocean sewage discharge system based on the JETLAG model. We will discuss the features of VISJET system and show how computer visualization can be used to help with the design of an ocean sewage discharge system.
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