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Numerical Simulation of Discharged Liquid Jet from Desalination Plants and Investigation Mixing Characteristics with Surroundings

Vafa, Narges | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52270 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Firoozabadi, Bahar
  7. Abstract:
  8. Today, due to the decline of drinkable water, many desalination plants have been established and operated around the world. Disposal of these brines, which have higher density and temperature than receiving water, causes many environmental impacts. Industrial power plants discharge these effluents into the seawater body mostly as submerged jets due to their higher effectiveness. Many experimental researches have been done on the negative and positive buoyant jet that discharged form desalination plants. But a few numerical studies have been done with investigating the full Navior-Stokes equations and they have been flawed in modeling. For example, some of these models have been able to predict the average characteristics of saline jet but they could not predict the mixing features of discharged jet. Also a few numerical studies have been done on positively buoyant jet and an appropriate model for predicting the positive jet behavior is not reported so far. In this thesis, the negative and positive discharged jet from desalination plants are studied using a finite volume model (OpenFoam). Various discretization schemes have been applied in the numerical model to assess the accuracy of numerical schemes in predicting the effluent discharge behavior. It was found that the LimitLinear1 scheme performed better among the schemes chosen. Also the effects of the turbulence intensity, SGS model in the large eddy simulation, the Froude number of discharged jet, turbulence model and equation state on the discharged jet behavior have been investigated. By choosing an appropriate scheme from the simulated saline jet, the positive buoyant jet has simulated and the effects of Froude number and turbulence model are also investigated. It was found that the LES turbulence model can predict the positive buoyant jet behavior better than RANS turbulence model and it is suitable from environmental view point
  9. Keywords:
  10. Water Desalination ; Mixing ; Discharged Jet ; Discretization Methods ; Large Eddy Simulation (LES) ; OpenFOAM Software ; Environmental Assessment

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