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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of pool boiling heat transfer and critical heat flux of nanostructured surfaces
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Experimental investigation of pool boiling heat transfer and critical heat flux of nanostructured surfaces

机译：纳米结构表面池沸腾传热和临界热通量的实验研究

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摘要

The present study aims to investigate the effect of pool boiling on nanostructured surfaces. For this purpose, nanocoating was performed on aluminum surface specimens by anodizing and their boiling heat transfer characteristics were compared with those of bare surface of aluminum. Also, the critical heat flux and boiling heat transfer coefficients were evaluated experimentally. Chromic acid and sulfuric acid solutions were utilized as the electrolytes. Prior to anodizing, sandblasting and etching were applied as mechanical and chemical treatments of the surfaces. The coating was performed over three different durations. The maximum critical heat flux was observed to occur in samples which had been weakly etched and anodized for 30 min in the sulfuric acid solution. Critical heat flux increased by 8% compared with that of the untreated aluminum alloy surface. Also, boiling heat transfer coefficient increased by 159% in weakly etched samples. In order to investigate surface characteristics, contact angle and atomic force microscope (AFM) images were used. The surface roughness and real area were measured in six samples. The AFM images indicated that surface roughness increased with anodizing time. The change in roughness was more pronounced in surfaces treated in the chromic acid solution compared with those treated in the sulfuric acid solution.
机译：本研究旨在调查池沸腾对纳米结构表面的影响。为此，通过阳极氧化在铝表面试样上进行了纳米涂层，并将其沸腾传热特性与铝的裸露表面进行了比较。另外，通过实验评估了临界热通量和沸腾传热系数。铬酸和硫酸溶液用作电解质。在阳极氧化之前，喷砂和蚀刻被用作表面的机械和化学处理。涂覆在三个不同的持续时间内进行。观察到最大临界热通量出现在已被硫酸溶液弱腐蚀和阳极氧化30分钟的样品中。与未经处理的铝合金表面相比，临界热通量增加了8％。同样，在弱腐蚀样品中沸腾传热系数增加了159％。为了研究表面特性，使用了接触角和原子力显微镜（AFM）图像。在六个样品中测量了表面粗糙度和实际面积。 AFM图像表明表面粗糙度随着阳极氧化时间的增加而增加。与用硫酸溶液处理过的表面相比，用铬酸溶液处理过的表面的粗糙度变化更为明显。

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