中文摘要：

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。

英文摘要：

The mathematical model for flow and heat transfer at the shell side of trisection helix heat exchanger was established to analyze the flow, temperature and pressure fields. The numeric simulation results show that the local velocities at the axis of the helix channel and some area near the shell cylinder are higher than the other regions. The vortex zones appear on the back of the baffles which can enhance the mixing： effect of the fluid. There is almost no stagnant zone in the flow channel. The fluid temperature drops steadily towards exit end along the axis and centripetally. Moreover, the pressure field appears a decrease trend step by step periodically.