Study on Manganese Nodule hydrolifting system with the cooperation of air-lift pump and jet pump

1.目的：本研究的目的是开发一种气提泵和射流泵协同工作的锰结核水力提升系统，为锰结核的回收系统做出贡献.方法：为了实现上述目标，组织了以下阶段。(1)气提泵扬水特性的数值模拟。(2)气液固三相流基本方程介绍。(3)垂直管内三相流流型分类方法的建立。(4)气提泵与射流泵联合作用下水体提升特性研究.研究结果：（1）为了用数值模拟的方法来了解气升泵对水的举升特性，需要得到气液两相流的漂移速度和压力损失与液流压力损失之比的关系式。一 关于我们 模拟结果表明，模拟结果与国家污染与资源研究所200 m长扬水管装置的实验结果相吻合。(2)建立了考虑物料质量元径向分布的一维三相流基本方程。在应用这些方程时，还需要包括漂移速度、质量分布、壁面切应力和热流密度等参数的本构方程。(3)根据压差脉动概率密度分布函数与流型的关系，对垂直管内三相流进行了分类。从上述关系可以看出，单峰分布和双峰分布分别表示泡状流和弹状流。这些分布之间的这种差异使得能够客观地对流型进行分类。(4)对气升泵与射流泵联合作用下的扬水特性进行了实验研究，考察了两泵连接顺序对扬水特性的影响。结果表明，气升泵-射流泵系统比射流泵-气升泵系统具有更高的举升效率。少

1. OBJECTIVE : This research objective is to develop a manganese nodules hydrolifting system with the cooperation of air-lift pump and jet pump, and consequently to contribute to the manganese nodules recovery system.2. APPROACH : In order to approach the above mentioned objective, the following phases were organized. (1) A numerical simulation for the lifting characteristics for water with an air-lift pump. (2) Introduction of basic equations for gas-liquid-solid three phase flows. (3) Establishment of a method to classify the flow patterns of the three phase flows in a vertical pipe. (4) Investigation on the lifting characteristics for water under the cooperation of air-lift pump and jet pump.3. RESULTS : (1) In order to appreciate the lifting characteristics for water with the air-lift pump with the numerical simulation, it is necessary to obtain the correlations concerning with the drift velocity and the ratio of the pressure loss for gas-liquid flows to the one for liquid flows. A … More s the results of this simulation, the presented simulation proved to be accountable for the experimental results which were obtained through the apparatus with a 200m length lifting pipe at National Research Institute for Pollution and Resources. (2) One dimensional basic equations for three phase flows were presented with taking into account the radial distribution of the material mass elements. In application of these equations, the constructive equations were also required, which included the parameters such as drift velocity, mass distribution, wall shear stress and heat flux. (3) Three phase flows in a vertical pipe were classified by means of the relationship between the probability density distribution function of differential pressure fluctuations and flow patterns. It is demonstrated from this above relationship that a single-peak distribution and a bi-peak distribution indicate the bubble flow and the slug flow, respectively. This difference among these distributions enables to objectively classify the flow patterns. (4) The lifting characteristics for water under the cooperation of air-lift pump and jet pump were experimentally investigated, and the effects of the connecting order of these pumps on the characteristics was examined. As a results, it was confirmed that the system of air-lift pump-jet pump achieved higher efficiency in the lifting characteristics for water than the one of jet pump-air lift pump. Less