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建立了三分螺旋折流板换热器壳侧流动与传热的数学模型,对其流场、温度场和压力场的数值模拟结果在多个纵剖面和横切片上进行了展示。可见在螺旋通道的轴心和靠近壳体的折流板外缘区域局部速度较高,在折流板背流面呈现出有利于强化掺混作用的回流区,流道内几乎没有流动死区;壳侧流体温度为稳步均匀下降趋势,并呈现从圆周的外缘向轴心方向逐渐递减;而压力场则呈现明显的周期性和阶梯性。
A mathematical model for the flow and heat transfer in the shell of the three-part helical baffle heat exchanger was established. The numerical simulation results of flow field, temperature field and pressure field were displayed on several longitudinal sections and cross sections. It can be seen that the local velocity is high in the axial center of the spiral channel and in the outer edge region of the baffle near the shell, and the backflow zone in the baffle presents a reflow zone which is conducive to strengthening blending. There is almost no flow dead zone in the flow channel; The temperature of shell fluid decreases steadily and uniformly, and decreases gradually from the outer edge of the circumference to the center of the axis. However, the pressure field shows obvious periodicity and gradient.