Experimental and Numerical Studies on the Vertical Flow of Variable Density Fluid in Different Directions

Zhifang Zhou,Qiaona Guo,Boran Zhang,Shumei Zhu

doi:10.1155/2019/2175983

Abstract

Injecting freshwater and pumping salt water are effective methods to restore the salt water in a coastal area. Based on a one-dimensional vertical experiment, the variable density flow is simulated under the condition of different injection directions and injection rates of fresh water. A one-dimensional mathematical model of variable density flow and solute transport is established. The mathematical models are solved using the implicit difference method. Fortran code is developed to simulate and verify the vertical flow of variable density flow in different directions. Through both numerical simulation and experimental studies, it is found that the variable density fluid in the direction of reverse gravity is different from that in the direction of gravity. On this basis, the most effective desalination model of salt water is further discussed. It provides a theoretical and technical method for the restoration of salt water in the vertical injection of freshwater. In order to improve the remediation efficiency and reduce the cost in the engineering application, the suitable water injection rate should be ensured, considering the suitable construction time and zone of a study area.

Highlights

The law of fluid flow is different from that in the homogeneous fluid, when the fluid density in the flow field is uneven [1]
This study provides a new method for the restoration of salt water in the vertical direction
The width of the transitional zone between the salt water and freshwater tends to be stable during the test

Summary

Introduction

The law of fluid flow is different from that in the homogeneous fluid, when the fluid density in the flow field is uneven [1]. Xue et al [9] developed a three-dimensional numerical model to simulate seawater intrusion and brine water and freshwater interaction in the Longkou-Laizhou area. They studied the interface distribution between freshwater and saltwater and evolution of the transitional zone and evaluated seawater intrusion caused by groundwater pumping. In order to prevent the seawater intrusion, the local government built an underground concrete cutoff wall, with the length of 4 kilometers and depth of 20 meters. It prevented further seawater intrusion, and good results have been achieved.

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Conclusion