Experimental and numerical investigations of multiphase jets

多相射流的实验和数值研究

• 批准号: RGPIN-2014-05704
• 负责人: Azimi, AmirHossein
• 金额: $ 1.75万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708293
• 关键词: Experimental; numerical; investigations; multiphase; jets

Sediment-laden and bubbly jets can be found in many engineering applications. Air injection into ambient water (i.e., bubbly jets) has been commonly used to enhance mixing and aeration in lakes and rivers, wastewater treatment, heat exchanger and industrial reactors. Sand-laden jets (i.e., slurry jets) can be found in mining operations, hydro-transport, dredging material disposal, and discharge of industrial and domestic wastewater. Understanding the dynamic interactions of air bubbles or sand particles with the ambient water are important for proper design and optimizing the engineering systems including oxygen diffusers and ocean outfalls. Extensive experimental investigations on bubbly jets have been carried out to measure the variations of bubble parameters such as bubble size, specific interfacial area, bubble velocity and ambient water structure. Early investigations of bubbly jets have shown that the mixing performance of bubbly jets is greatly influenced by the bubble size. Slurry jets have also many industrial and engineering applications, such as, slurry transport, marine bed capping, mining operations, dredging material disposal, and discharge of industrial and domestic wastewater. Understanding the dynamic interactions of the sediment particles and its ambient are important for proper design and optimizing those engineering systems. Depending upon the flow configurations, sediments can be transported through pipelines/channels or can be passed through a nozzle to form a slurry jet. Dynamic interactions of the sand particles and its ambient are also correlated with the physical characteristics of sediments such as sediment size, shape, density and concentration. This program attempts to understand the underlying mechanisms between different phases (i.e., solid, liquid and gas phases) and tries to enhance the existing knowledge in this field. Both experimental and numerical approaches are going to be used to study the problem. Highly qualified personnel will be trained to pursue research in this area and monitor the existing systems in both nature and industry. Numerical modeling can be a suitable choice to study the dynamics of sediment-laden and bubbly jets. Commercial modeling packages or research-based open source models can be used in this program. Many scenarios can be simulated using a validated model to study other flow configurations for designing and optimization purposes. Sub-routines can be developed for research-based codes to enhance the capability of models for more accurate simulations in this field.

在许多工程应用中都可以看到充满沉积物和气泡的射流。将空气注入环境水中（即气泡射流）通常用于增强湖泊和河流、废水处理、热交换器和工业反应器中的混合和曝气。载砂射流（即泥浆射流）常见于采矿作业、水力运输、疏浚材料处理以及工业和生活废水排放中。了解气泡或沙粒与环境水的动态相互作用对于正确设计和优化工程系统（包括氧气扩散器和海洋排放口）非常重要。 人们对气泡射流进行了广泛的实验研究，以测量气泡参数的变化，例如气泡尺寸、比界面面积、气泡速度和环境水结构。对气泡射流的早期研究表明，气泡射流的混合性能很大程度上受气泡尺寸的影响。泥浆喷射机还具有许多工业和工程应用，例如泥浆运输、海洋床层覆盖、采矿作业、疏浚材料处理以及工业和生活废水排放。了解沉积物颗粒与其周围环境的动态相互作用对于正确设计和优化这些工程系统非常重要。根据流动配置，沉积物可以通过管道/通道输送，或者可以通过喷嘴形成浆料射流。沙粒与其周围环境的动态相互作用也与沉积物的物理特征相关，例如沉积物的尺寸、形状、密度和浓度。 该计划试图了解不同相（即固相、液相和气相）之间的潜在机制，并试图增强该领域的现有知识。将使用实验和数值方法来研究这个问题。高素质人员将接受培训，以从事该领域的研究并监测自然和工业中的现有系统。数值模型是研究充满沉积物和气泡射流动力学的合适选择。该程序可以使用商业建模包或基于研究的开源模型。可以使用经过验证的模型来模拟许多场景，以研究其他流配置以实现设计和优化目的。可以为基于研究的代码开发子例程，以增强模型的能力，从而在该领域进行更准确的模拟。