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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Some investigations on the enhancement of boiling heat transfer from planer surface embedded with continuous open tunnels
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Some investigations on the enhancement of boiling heat transfer from planer surface embedded with continuous open tunnels

机译：加强连续开敞式隧道平面内沸腾传热的一些研究

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摘要

Boiling heat transfer from a flat surface can be enhanced if continuous open tunnel type structures are embedded in it. Further, improvement of boiling heat transfer from such surfaces has been tried by two separate avenues. At first, inclined tunnels are embedded over the solid surface and an effort is made to optimize the tunnel inclination for boiling heat transfer. Surfaces are manufactured in house with four different inclinations of the tunnels with or without a reentrant circular pocket at the end of the tunnel. Experiments conducted in the nucleate boiling regime showed that 45° inclination of the tunnels for both with and without base geometry provides the highest heat transfer coefficient. Next, active fluid rotation was imposed to enhance the heat transfer from tunnel type surfaces with and without the base geometry. Rotational speed imparted by mechanical stirrer was varied over a wide range. It was observed that fluid rotation enhances the heat transfer coefficient only up to a certain value of stirrer speed. Rotational speed values, beyond this limit, reduce the boiling heat transfer severely. A comparison shows that embedding continuous tunnel turns out to be a better option for the increase of heat transfer coefficient compared to the imposition of fluid rotation. But the behavior of inclined tunnels under the action of fluid rotation is yet to be established and can be treated as a future scope of the work.
机译：如果将连续的敞开隧道式结构嵌入其中，则可以增强从平坦表面产生的沸腾传热。此外，已经通过两种单独的途径尝试了改善从这种表面的沸腾传热。首先，将倾斜的隧道埋在固体表面上，并努力优化隧道的倾斜度以进行沸腾传热。在具有四个不同倾斜度的隧道的室内制造表面，在隧道的末端有或没有凹入的圆形凹穴。在成核沸腾状态下进行的实验表明，无论有或没有基础几何形状，隧道的45°倾角均可提供最高的传热系数。接下来，施加主动流体旋转以增强具有和不具有基础几何形状的隧道型表面的热传递。机械搅拌器赋予的转速在很宽的范围内变化。观察到，流体旋转仅在搅拌器速度达到一定值时才提高传热系数。超过该极限的转速值严重降低了沸腾传热。比较表明，与施加流体旋转相比，嵌入连续隧道对于增加传热系数是更好的选择。但是，倾斜隧道在流体旋转作用下的行为尚待确定，可以作为今后工作的范围。

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