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首页> 外文期刊>International journal of nuclear desalination >Heat Transfer Enhancement Of Falling Film Evaporation On A Horizontal Tube Bundle
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Heat Transfer Enhancement Of Falling Film Evaporation On A Horizontal Tube Bundle

机译：水平管束上降膜蒸发的传热增强

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摘要

The enhancement of the evaporation heat transfer coefficient is important for the design and operation of horizontal tube spray film evaporators. The water spray on a horizontal tube bundle is numerically studied in steady state conditions. The objective of the present work is to numerically study the effect of the tube configuration and the operating conditions on the evaporation heat transfer coefficient. In addition, the enhancement of the evaporation rate ratio by constructing a water collector around the bottom-heated tube is also numerically studied. In order to evaluate the evaporation rate ratio and the heat transfer coefficient of the falling liquid film on the horizontal tube bundle, the nondimensional governing equations of the mass, momentum and energy of the created liquid film around the hot tube surface are solved numerically using the finite difference method. The results show that the evaporation rate ratio is mainly increased by increasing both the surface temperature and the tube's outer diameter. The evaporation rate ratio enhances by decreasing the chamber pressure and inlet liquid subcooling. The falling distance has little influence on the evaporation rate ratio. Moreover, constructing a water collector around the bottom-heated tube enhances the evaporation rate ratio. The increase in the evaporation rate ratio increases by higher heat flux and also by larger the gap between the collector and the tube surface.
机译：蒸发传热系数的提高对于水平管喷膜蒸发器的设计和操作很重要。在稳态条件下对水平管束上的喷水进行了数值研究。本工作的目的是从数值上研究管结构和工作条件对蒸发传热系数的影响。另外，还对通过在底部加热管周围构造集水器来提高蒸发速率比进行了数值研究。为了评估水平管束上降落的液膜的蒸发速率比和传热系数，使用以下公式对在热管表面形成的液膜的质量，动量和能量的无量纲控制方程进行数值求解。有限差分法。结果表明，蒸发速率比主要通过增加表面温度和管的外径来增加。通过降低腔室压力和入口液体过冷来提高蒸发速率比。下降距离对蒸发速率比影响很小。而且，在底部加热管的周围构造集水器提高了蒸发速率比。蒸发速率比的增加通过较高的热通量以及通过收集器与管表面之间的较大间隙而增加。

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