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建立了外径为3 mm的内螺纹管三维实体模型,使用Fluent软件研究了在不同的进口雷诺数和操作压力下超临界二氧化碳在水平内螺纹管内的流动与传热特性。研究表明:不同截面局部换热系数和相同流体局部平均温度下的局部换热系数均随着冷却压力的增大而增大;相同流体局部平均温度下的局部换热系数随着进口雷诺数的增加而增大;不同冷却压力和进口雷诺数下,流体局部平均温度越接近超临界二氧化碳的临界点温度,局部换热系数也就越大。
A three-dimensional solid model of the internally threaded tube with an outer diameter of 3 mm was established. The flow and heat transfer characteristics of the supercritical carbon dioxide in a horizontal threaded tube under different inlet Reynolds numbers and operating pressures were studied using Fluent software. The results show that the local heat transfer coefficients at different cross-sections and the local average temperature of the same fluid both increase with the increase of cooling pressure. The local heat transfer coefficients at the local mean temperature of the same fluid vary with the inlet Reynolds number Increase and increase; under different cooling pressure and inlet Reynolds number, the fluid local average temperature is closer to the critical point temperature of supercritical carbon dioxide, the greater the local heat transfer coefficient.