管道相对表面积对壳管式换热器流动与传热的影响
Influence of tube relative surface area on flow and heat transfer of shell-and-tube heat exchangers
摘要：
利用Fluent软件对壳管式换热器进行了三维数值模拟，分析了4种管道相对表面积不同换热器的换热性能。结果显示：管道截面积相等时，管道相对表面积越大的换热器，其换热性能越好；当壳侧流体进口速度0.8 m/s、温度25 ℃时，相对于常规圆形管道壳管式换热器来说，正方形管道换热器壳侧流体进出口温差提高了24.38%，椭圆形管道换热器提高了34.06%，长方形管道换热器提高了45.52%。
Abstract：
Carries out three-dimensional numerical simulation of shell-and-tube heat exchangers by Fluent software. Analyses the heat transfer performance of different heat exchangers with four kinds of relative surface area. The results show that the larger the relative surface area of the tubes, the better the heat transfer performance of the heat exchanger. When the inlet flow rate of shell side is 0.8 m/s and the temperature is 25 ℃, relative to the conventional circular-tube shell-and-tube heat exchanger, the temperature difference between inlet and outlet of square-tube heat exchanger shell side increases by 24.38%, elliptic-tube heat exchanger by 34.06%, and rectangular-tube heat exchanger by 45.52%.
Keywords:relative surface area, heat transfer enhancement, shell-and-tube heat exchanger, numerical simulation,shaped tube