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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nanoparticle layer detachment and its influence on the heat transfer characteristics in saturated pool boiling of nanofluids
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Nanoparticle layer detachment and its influence on the heat transfer characteristics in saturated pool boiling of nanofluids

机译：纳米流体饱和池沸腾中的纳米颗粒层分离及其对传热特性的影响

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摘要

In nucleate pool boiling of nanofluid, nanoparticles suspended in liquid are deposited to form nanoparticle layer on the heated surface. As a result, surface properties are changed and the critical heat flux (CHF) is usually enhanced. However, since adhesion of the nanoparticle layer to the heated surface is not necessarily strong, partial detachment of the nanoparticle layer frequently occurs during nucleate boiling. In this study, peeling test was conducted for the nanoparticle layer formed during nucleate boiling of the water-based nanofluids to measure the adhesion force. The material of the heated surface was copper, and TiO2, Al2O3and SiO2were used as the nanoparticle material. It was found that the adhesion force is highly dependent on the nanoparticle material; it was greatest for SiO2and weakest for TiO2in the present experiments. Then, saturated pool boiling curves were obtained using the damaged heated surfaces after the peeling. For the nanoparticle-layer coated surfaces without peeling, the heat transfer coefficient (HTC) was lower and CHF was higher than those for the bare surface. It was shown that with an increase in the mass of the nanoparticles removed by peeling, the decrease of HTC and the increase of CHF were mitigated. Even higher HTC values and a lower CHF value than those for the bare heated surface were measured for significantly damaged surfaces.
机译：在纳米流体的核池沸腾中，悬浮在液体中的纳米颗粒沉积以在加热的表面上形成纳米颗粒层。结果，表面性质改变并且通常提高临界热通量（CHF）。然而，由于纳米颗粒层对加热的表面的粘附力不一定强，因此在成核沸腾期间经常发生纳米颗粒层的部分剥离。在这项研究中，对在水基纳米流体的成核沸腾过程中形成的纳米颗粒层进行了剥离测试，以测量其粘附力。被加热表面的材料是铜，并且TiO 2，Al 2 O 3和SiO 2被用作纳米颗粒材料。已经发现粘附力高度依赖于纳米颗粒材料。在本实验中，SiO2最大，而TiO2最弱。然后，在剥离后使用受损的受热表面获得饱和池沸腾曲线。对于没有剥离的纳米颗粒层涂覆的表面，传热系数（HTC）较低，而CHF高于裸表面。结果表明，随着通过剥离去除的纳米颗粒的质量增加，HTC的减少和CHF的增加得到缓解。对于严重损坏的表面，甚至测量出比裸露的加热表面更高的HTC值和更低的CHF值。

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