突扩管道中的湍流传热数值模拟与分析研究

Numerical simulation and analysis of turbulent heat transfer in an expanding pipeline

在能源、动力、化工等领域存在各式各样的管道流动,其中突扩管道尤为常见。在实际的供热工程中管道内流体流动大多为湍流流动,所以对突扩管道内的湍流传热规律进行研究具有重要意义。利用ICEM软件建立轴对称扩管数学模型并利用FLUENT软件对轴对称突扩管道中的湍流传热进行模拟和数值计算,通过温度、速度分布云图及沿加热壁面的努塞尔数的变化曲线得出突扩管道中的湍流传热规律。发现在突扩处产生回流,且传热加强。这可以给突扩管道的设计研究提供理论依据。

In energy, power, chemical and other industrial fields, there are a variety of pipeline flow, especially the sudden expansion of the pipeline is common. In practical heating engineering, the fluid flow in pipelines is mostly turbulent flow, so it is of great significance to study the law of turbulent heat transfer in the pipeline with sudden expansion. Using ICEM software to establish the mathematical model and axisymmetric expansion tube by using FLUENT software to simulate the turbulent heat transfer in axisymmetric sudden expansion pipe and numerical calculation, through the temperature and velocity distribution contours and the nusselt number along the heating surface at the sudden enlargement draw change curve of the pipeline turbulent heat transfer law. The flow returns at the point of outburst, and enhance heat transfer. This provides a theoretical basis for the design and research of the pipeline with sudden expansion.