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首页> 外文期刊>International Journal of Heat and Mass Transfer >Enhancement of pool boiling heat transfer in water on aluminum surface with high temperature conductive microporous coating
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Enhancement of pool boiling heat transfer in water on aluminum surface with high temperature conductive microporous coating

机译：高温导电微孔涂层增强铝表面水在水中的沸腾沸腾传热

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The effects of an aluminum high temperature conductive microporous coating (Al-HTCMC) on the nucleate boiling heat transfer (NBHT) coefficient and critical heat flux (CHF) are studied in saturated distilled water at 1 atm. Aluminum powders with three different mean particle diameters (d(m) = 11,24, and 66 pm) are used in the fabrication of the Al-HTCMC. For each mean particle diameter, an optimal coating thickness to yield the highest NBHT coefficient is determined. The optimized Al-HTCMC thickness is found to result in comparable NBHT coefficients regardless of the particle diameter. Pool boiling tests with a plain aluminum surface are used for comparison. The coated and plain aluminum surfaces are treated equally before the pool boiling tests to establish a Boehmite oxidation nano layer on the aluminum surfaces. Following the Boehmite treatment, the contact angle is unmeasurable (similar to 0 degrees) with the Al-HTCMC surface and 12 degrees with a plain aluminum surface. Then, pool boiling tests are performed and reveal comparable CHF (1725-1850 kW/m(2)) values with or without the Al-HTCMC. However, the Al-HTCMC is shown experimentally to improve the NBHT coefficient by a factor of five as the wall superheat is reduced by from 31 K to 6 K just before CHF. The results obtained are also compared to similar work using an HTCMC layer on a copper surface to demonstrate the performance of the Al-HTCMC. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在1 atm的饱和蒸馏水中研究了铝高温导电微孔涂层（Al-HTCMC）对核沸腾传热（NBHT）系数和临界热通量（CHF）的影响。在Al-HTCMC的制造中使用具有三种不同平均粒径（d（m）= 11,24和66 pm）的铝粉。对于每个平均粒径，确定产生最高NBHT系数的最佳涂层厚度。发现最佳的Al-HTCMC厚度导致可比较的NBHT系数，而与粒径无关。使用具有普通铝表面的水池沸腾测试进行比较。在池沸腾测试之前，对镀铝和普通铝表面进行均等处理，以在铝表面上建立勃姆石氧化纳米层。经过勃姆石处理后，Al-HTCMC表面的接触角无法测量（大约为0度），而铝表面的接触角则无法测量为12度。然后，进行池沸腾测试，并显示在有或没有Al-HTCMC的情况下可比较的CHF（1725-1850 kW / m（2））值。但是，实验表明，Al-HTCMC可以将壁温从CHF之前的31 K降低到6 K，从而将NBHT系数提高了五倍。还将获得的结果与在铜表面使用HTCMC层的类似工作进行比较，以证明Al-HTCMC的性能。 （C）2018 Elsevier Ltd.保留所有权利。

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