Abstract

The heat transfer characteristics of shell-and-tube exhaust gas recirculation (EGR) coolers with different tube bundles were studied by experiment and numerical simulation. The overall heat transfer coefficient and shell-side pressure drop were determined. The influences of tube spacing, baffle form, baffle arrangement and number on the overall heat transfer coefficient and shell-side pressure drop were investigated. The maximum differences between the numerical and experimental results are approximately 4.1% for overall heat transfer coefficient and 3.3% for shell-side pressure drop, respectively. The results indicate that the overall heat transfer coefficient of EGR cooler with wave fin arrays internally finned tubes is 1.3~1.7 times than that of EGR cooler with longitudinal plate-rectangle internally finned tubes. And the comprehensive heat performance is more reasonable when tube spacing and baffle number are equal to 12 mm and 9, respectively. It is confirmed that the trisection ellipse helical baffle is superior to the segmental baffle, but the influence of improving overall thermal performance by setting baffles is limited for small EGR cooler.

中文翻译：

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不同管束的管壳式废气再循环冷却器的实验和数值研究

摘要

通过实验和数值模拟研究了不同管束的管壳式废气再循环（EGR）冷却器的传热特性。确定了总的传热系数和壳侧压降。研究了管间距，折流板形式，折流板布置和数量对总传热系数和壳侧压降的影响。数值和实验结果之间的最大差异分别是，总传热系数约为4.1％，壳侧压降约为3.3％。结果表明，带翅片阵列内翅片管的EGR冷却器的总传热系数是带纵板矩形内翅片管的EGR冷却器的1.3〜1.7倍。当管间距和挡板数分别等于12 mm和9时，综合热性能更加合理。可以确定的是，三等分椭圆形螺旋挡板优于分段挡板，但是对于小型EGR冷却器，通过设置挡板来改善整体热性能的影响受到限制。