导向型折流栅强化换热器壳程传热的数值模拟

Numerical Simulation on Heat Transfer Enhancement in Shell Side of Shell-and-Tube Heat Exchanger with Leading Type Shutter Baffles

提出壳程流体"斜向流"的新概念,解决了管壳式换热器性能提升的同时伴随流体流动阻力大幅增加的矛盾。研制了具有导向型折流栅管束支撑结构的新型高效节能斜向流管壳式换热器。采用场协同理论分析该换热器的强化传热机理,证明在此类换热器壳程中流体速度场与温度梯度场具有良好的协同关系。数值模拟了几何结构对传热和压降的影响规律,模拟结果与实验数据吻合良好。

For overcoming the contradiction between the performance improvement and fluid flow resistance increase in shell-and-tube heat exchanger,a new concept of ＂Sideling Flow＂ in shell side is presented,and a type of new high efficiency energy saving shell-and-tube heat exchanger with leading type shutter baffles in shell side,sideling flow heat exchanger is invented.Besides,the＂Field Synergy Principle＂ is adopted to analyze its heat transfer enhancement mechanism,and it is indicated that there is the perfect synergy between the velocity field and temperature grads field in shell side of this type of new heat exchanger.Effects of the structure parameters on the fluid flow and heat transfer are investigated through numerical simulation,and the numerical results are in good agreement with the experimental data.