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目的对带有循环连续螺旋折流板静态固液混合换热器(SLMBH)中的速度场和温度场进行三维数值仿真研究。方法分别分析影响混合对流换热效果的三种因素:雷诺数,轴点间距,管半径;针对不同雷诺数和管半径对混合换热的影响,与光滑管进行对比分析;应用场协同原理对数值仿真结果进行对比分析。结果随着雷诺数的增加,循环连续螺旋折流板能够有效地提高混合段的固液混合对流换热效果;存在一个最佳的轴点间距和管半径匹配,可以使混合换热效果达到最佳;应用场协同理论可以很好地解释说明带有循环连续螺旋折流板的静态固液混合换热器的混合换热机制。结论固体粒子流与液态工作流之间的场协同关系越好,混合换热效率越高。
Objective To simulate the three-dimensional numerical simulation of velocity field and temperature field in a static solid-liquid hybrid heat exchanger (SLMBH) with continuous helical baffles. Methods Three kinds of factors which affect the heat transfer effect of mixed convection were analyzed respectively: Reynolds number, axial distance and tube radius. The influence of different Reynolds number and tube radius on heat transfer was compared with that of smooth tube. Numerical simulation results for comparative analysis. Results With the increase of Reynolds number, the continuous helical baffles can effectively improve the mixed heat-transfer effect of solid-liquid mixture in the mixing section. There is an optimal axial-axis spacing and tube radius matching, which can maximize the mixing heat transfer effect Good application field synergy theory can well explain the mixed heat exchange mechanism of static solid-liquid hybrid heat exchanger with continuous spiral baffles. Conclusion The better the synergistic field relationship between the solid particle flow and the liquid flow, the higher the heat exchange efficiency.