内螺纹换热管温度场研究

The Research on the Temperature Field of the Internal Threaded Heat Exchanger Tubes

摘要: 本文对不同结构参数(如有无螺纹、不同螺距、不同螺旋角、不同螺纹高度等)的内螺纹换热管在不同工况条件(如流体不同进口温度、不同进口速度、不同流体材料等)时的流动传热情况进行数值模拟研究。使用UG软件构建内螺纹换热管的流动传热模型、运用ANSYS软件对所建模型进行网格划分和流动传热过程模拟及后处理分析，研究结论：相同前提下，流体进口温度越大、螺距越小、螺旋角越小、螺纹越高，换热管的换热效果越好；有螺纹比无螺纹时换热管的换热效果好、螺纹比直纹的换热效果要好；本文中低雷诺数、单一热传导方式模拟时，流体进口速度越小，换热效果越好。通过本文研究，加深对内螺纹换热器的流动传热机制的认识，为内螺纹换热器的结构优化及工况设计提供一些参考信息。

Abstract: The situation of the flow heat transfer of the internal thread of the heat exchange tubes with different structural parameters (such as having or no threads, different pitches, different thread angles, different thread heights,etc) and different working conditions (such as different inlet temperature of the fluid, different inlet velocity of the fluid, and different fluid materials, etc) is simulated and researched in this thesis. The flow field models of the internal thread of the heat exchange tubes are constructed by using UG software, the constructed models are meshed, the flow heat transfer process is numerically simulated and the post-processing analysis is done by using ANSYS software. The research conclusions as follows: Under the same premise. The heat transfer effect is better when the inlet temperature of the fluid is higher, or the pitch is smaller, or the thread angle is smaller, or the thread is higher; The heat transfer effect is better when the heat exchange tube has threads than that without thread; The heat transfer effect is better when the heat exchanger tube has thread than that has the straight grain; The heat transfer effect is better when the inlet velocity of the fluid is lower, the simulation is done using a single heat conduction mode with a low Reynolds number in this thesis. The understanding of the flow heat transfer mechanism of the internal thread heat exchanger is deepened, and some reference information is provided for the structure optimization and working condition design of the internal thread heat exchanger through the research in this thesis.