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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Fluid flow and heat transfer for a particle-laden gas modeled as a two-phase turbulent flow
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Fluid flow and heat transfer for a particle-laden gas modeled as a two-phase turbulent flow

机译：建模为两相湍流的含颗粒气体的流体流动和传热

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Purpose - The purpose of this study is to examine the physical processes experienced by a particle-laden gas due to various types of collisions, different heat transfer modalities and jet axis switching. Here, attention is focused on a particle-laden gas subjected to jet axis switching while experiencing fluid flow and heat transfer. Design/methodology/approach - The methodology used to model and solve these complex problems is numerical simulation treated here as a two-phase turbulent flow in which the gas and the particles keep their separate identities. For the turbulent flow model, validation was achieved by comparisons with appropriate experimental data. The considered interactions between the fluid and the particles include one-way fluid-particle interactions, two-way fluid-particle interactions and particle-particle interactions. Findings - For the fluid flow portion of the work, emphasis was placed on the particle collection efficiency and on independent variables that affect this quantity and the trajectories of the fluid and of the particles as they traverse the space between the jet orifice and the impingement plate. The extent of the effect depended on four factors: particle size, particle density, number of particles and the velocity of the fluid flow. The major effect on the heat transferred to the impingement plate occurred when direct heat transfer between the impinging particles and the plate was taken into account. Originality/value - This paper deals with issues never before dealt with in the published literature: the effect of jet axis switching on the fluid mechanics of gas-particle flows without heat transfer and the effect of jet axis switching and the presence of particles on jet impingement heat transfer. The overall focus of the work is on the impact of jet axis switching on particle-laden fluid flow and heat transfer.
机译：目的-这项研究的目的是检查由于各种类型的碰撞，不同的传热方式和射流轴转换而导致的含颗粒气体所经历的物理过程。在此，注意力集中在经历流体流动和传热的同时经受射流轴转换的载有颗粒的气体。设计/方法/方法-用于建模和解决这些复杂问题的方法在此处作为数值模拟，视为两相湍流，其中气体和颗粒保持各自独立的身份。对于湍流模型，通过与适当的实验数据进行比较来验证。所考虑的流体与颗粒之间的相互作用包括单向流体-颗粒相互作用，双向流体-颗粒相互作用和颗粒-颗粒相互作用。调查结果-对于工作的流体流动部分，重点在于颗粒收集效率和影响该量的独立变量，以及当流体和颗粒横穿射流孔与冲击板之间的空间时，它们的运动轨迹。影响的程度取决于四个因素：颗粒大小，颗粒密度，颗粒数和流体流动速度。当考虑到撞击颗粒和板之间的直接传热时，发生了对传递给撞击板的热的主要影响。原创性/价值-本文处理的问题是以前发表的文献中从未处理过的问题：射流轴切换对没有传热的气体粒子流的流体力学的影响以及射流轴切换的影响以及射流上粒子的存在碰撞传热。这项工作的总体重点是射流轴切换对载有颗粒的流体流动和传热的影响。

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