MODELLING OF DENSE JET IN CO-FLOW AND COUNTER FLOW
Wastewater effluents with a density higher than that of the environment are often discharged into coastal waters in the form of submerged dense (negatively buoyant)jets. Examples include brine discharge from desalination plants, cooled water from liquefied natural gas plants and gypsum waste from fertilizer factories. It is necessary to design dense jet discharges to achieve rapid mixing and minimize the environmental impact. Currently, however, there is no generally accepted predictive model for the mixing of a dense jet in a current. In the present study, numerical modelling of mixing and near-intermediate field interactions of upward discharged dense jet is carried out. The near field behaviour of the jet is computed by the Lagrangian jet model JETLAG. The mixing and transport in the intermediate field is predicted by dynamically coupling a three-dimensional (3D)shallow water circulation model with JETLAG using a Distributed Entrainment Sink Approach (DESA). Simulation of inclined dense jet in stagnant water and flowing current has been undertaken. The 3D model is able to simulate the initial rise and fall of the jet as well as the spreading layer along the bottom. The computed dilutions agree well with those obtained from the laboratory experiments,which demonstrate the feasibility of using the DESA method to compute the mixing of dense jet in a current.
dense jet numerical model mizing near and intermediate field coupling
KW Choi Daeyoung Yu Joseph HW Lee
Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
603-607
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）