Shell and tube heat exchanger is widely used in pump station, oil refinery and other chemical production. Its structure is simple, solid, easy to manufacture, large processing capacity, adaptability and large operation flexibility, especially in high pressure, high temperature and large-scale units. U-tube heat exchanger is a typical shell and tube heat exchanger, whose tube is bent into U-shape. Because of its simple structure, cheaper cost and stronger pressure bearing capacity than other heat exchangers, it is suitable for the occasions where the temperature difference between the tube and the shell wall is large or the medium in the shell side is easy to scale and needs cleaning, and floating head type and fixed tube plate are not suitable. It is especially suitable for materials with high temperature, high pressure and high corrosiveness which are clean and not easy to scale. Based on the feasibility of FLUENT software in shell and tube heat exchanger, and the research of U-tube heat exchanger in fluent numerical simulation is less, this paper establishes the model of U-tube heat exchanger, studies the relationship between the temperature field and velocity field of U-tube heat exchanger inlet section, through the heat<br>
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