管壳式冷却器两相流动传热及压降特性分析
Analysis of Heat Transfer and Pressure Drop Characteristics of Two-Phase Flow in Shell-and-Tube Cooler

本文针对某压缩机出口管壳式冷却器进行研究，通过理论分析并考虑其壳程热流体的相变影响，给出了壳程出口温度及压降的计算表达式，数值结果与已有实测数据进行了对比验证，研究了结构参数对其壳程出口温度及压降的影响。计算结果表明冷却器壳程出口温度随管程介质密度的增加而增加，同时随换热管的外径增大而减小。换热管和折流板的间距及其缺口高度对壳程的流阻压降影响显著，壳程压降随换热管横向及纵向管间距、折流板间距及缺口高度的增大而减小，随壳程流体流量的增大而增大，呈非线性变化。
A shell-and-tube cooler at the outlet of a compressor is studied in this paper. Through theoretical analysis and considering the effect of phase change of the thermal fluid in the shell side, the calcu-lation expressions for the outlet temperature and pressure drop of the shell side are given. The numerical results are compared and verified with the existing measured data, and the influence of structural parameters on the outlet temperature and pressure drop of the shell side is studied. The calculation results show that the outlet temperature of the shell side of the cooler increases with the increase of the medium density of the tube side, and at the same time, it decreases with the increase of the outer diameter of the heat exchange tube. The heat exchange tube, the baffle spacing and the height of baffle notch have a significant effect on the pressure drop of the shell side. The pressure drop in the shell side decreases with the increase of the heat exchange tube’s transverse and longitudinal tube spacing, baffle spacing and notch height, and increases with the increase of the shell side fluid flow, showing a non-linear change.