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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of particle volume fraction on spray heat transfer performance of Al_2O_3-water nanofluid
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Effects of particle volume fraction on spray heat transfer performance of Al_2O_3-water nanofluid

机译：颗粒体积分数对Al_2O_3-水纳米流体喷雾传热性能的影响

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An experimental investigation is conducted into the effects of the particle volume fraction on the spray heat transfer performance of a nanofluid comprising de-ionized water and Al_2O_3 particles with a diameter of 35 nm. The tests are performed with a flat, horizontal heated surface using a nozzle with an orifice diameter of 0.7 mm and a nozzle-to-heated surface distance of 17 mm. The spray mass flux is varied in the range of 26.433-176.751 kg/m~2s, while the particle volume fraction is specified as 0%, 0.001%, 0.025%, or 0.05%. It is found that the optimal heat transfer performance is obtained using a particle volume fraction of 0.001%. The surface compositions of the sprayed samples are observed using scanning electron microscopy. The results show that the surfaces sprayed with a nanofluid containing 0.025 Vol% or 0.05 Vol% of nanoparticles contain a small amount of Al. However, those cooled using a nanofluid with a particle volume fraction of 0% or 0.001% show no traces of Al.
机译：对颗粒体积分数对包含去离子水和直径为35 nm的Al_2O_3颗粒的纳米流体的喷雾传热性能的影响进行了实验研究。使用喷嘴直径为0.7 mm的喷嘴与加热表面之间的距离为17 mm的喷嘴在平坦的水平加热表面上进行测试。喷雾质量通量在26.433-176.751 kg / m〜2s的范围内变化，而颗粒体积分数指定为0％，0.001％，0.025％或0.05％。发现使用0.001％的颗粒体积分数可获得最佳的传热性能。使用扫描电子显微镜观察喷雾样品的表面组成。结果表明，用含有0.025％（体积）或0.05％（体积）的纳米颗粒的纳米流体喷涂的表面含有少量的Al。但是，使用纳米流体（颗粒体积分数为0％或0.001％）冷却的材料没有痕量的Al。

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