动量比对气液射入压载水管路混溶过程的影响  

Influence of momentum ratio on mixing process of gas-liquid jetting into ballast water discharge pipe crossflow

作　　者：谷建龙[1] 张芝涛[1] 白敏冬[1] 

机构地区：[1]大连海事大学环境工程研究所,辽宁大连116026

出　　处：《化工学报》2009年第1期48-54,共7页CIESC Journal

基　　金：国家科技支撑计划重点项目(2006BAC11B06);新世纪优秀人才支持计划(NCET-05-0296)~~

摘　　要：船舶排放的压载水是造成地理性隔离水体间有害生物传播的最主要途径,至今还没有一种环境友好的阻断方法。在压载水输运管路中,利用高级氧化技术可以有效致死水中携带的大量海洋微小生物,是目前实现在船在线治理远洋船舶压载水最可行的方法。但由于压载水排放量大、流速高,其与高级氧化剂溶液的混溶过程直接影响海洋微小生物的致死效果。针对这一问题,利用Eulerian-Eulerian双流体模型数值模拟了含有羟基自由基的气液垂直射入压载水输运管路的混溶过程。气体体积分数示踪结果显示,在约束横流环境中,冲击射流在上游壁面形成的scarf涡是形成下游反向涡旋对的主要原因,也是冲击射流与横流混合的源动力。同时也发现在下游壁面射流内存在气体集中的问题。Ship＇s ballast water is the mare way oi spreading harmful organisms between the geographically isolated water bodies, but it still can not be prevented with an environment friendly method at present. It is regarded as the most feasible online approach that the large number invasive microbes in ballast water are killed by advanced oxidant. However, it is a challenge how the reactive free radicals contact the large number microbes in large-volume and high-flow rate ballast water. In the paper, the Eulerian-Eulerian two- equation model was used to simulate the mixing process in which gas-liquid jet including reactive free radicals impinges into the ballast water in crossflow. The results showed that scarf vortices were formed in the upstream, leading to counter-rotating vortices in the downstream in confined crossflow, which enhanced the mixing process. However, the gas was not easy to diffuse in the gas-liquid jet on the downstream wall surface.

关 键 词：气液冲击射流 约束横流 Eulerian-Eulerian双流体模型 压载水处理 

分 类 号：X55[环境科学与工程—环境工程] O358[理学—流体力学]