紧凑高效型水平管束降膜蒸发换热器的实验研究

在大气压条件下使用单列和3列叉排光滑管和滚压强化换热管紧凑管束进行了水降膜蒸发换热实验，确认了滚压管在中，低热负荷范围内能够增强换热系数3～4倍，有很好的沸腾强化换热性能。管间距及液膜溅射损失对蒸发换热特性影响很小。同时也考察了单列和3列管束换热特性闯的差异。实验发现这种差异在低雷诺数区域时更加明显。

Experimental Study of a Falling-film Evaporative Heat Exchanger Composed of Compact and High-efficiency Horizontal Tube Banks

Under atmospheric conditions a water falling film evaporative heat exchange test was performed of compact tube banks composed of single row and three row staggered smooth tubes and roll pressed intensified heat exchange ones. It has been confirmed that under intermediate and low thermal loads the heat exchange factor of the roll pressed tubes can be enhanced 3 4 times, thus exhibiting excellent intensified boiling heat exchange performance. Tube pitch and losses due to liquid film splatter have a very small influence on evaporative heat exchange characteristics. Also investigated is the difference in heat exchange characteristics of the single row and three row tube banks. Tests have shown that such difference is more marked in a low Reynolds number zone.