Experimental study of pool boiling heat transfer on copper surfaces with Cu-Al2O3 nanocomposite coatings
Experimental study of pool boiling heat transfer on copper surfaces with Cu-Al2O3 nanocomposite coatings
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DOI：
10.1016/j.icheatmasstransfer.2018.07.004
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发表时间：
2018-10-01
影响因子：
7
通讯作者：
Misra, Rahul Dev
中科院分区：
文献类型：
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作者：
Gupta, Sanjay Kumar;Misra, Rahul Dev
目前纳米科学的发展为现代技术在节能领域的研究创造了广阔的空间，减少了能量转换应用中的能量耗散。沸腾传热强化是提高能量转换应用性能的一个重要而前沿的研究领域。实验研究了常压下饱和去离子水在具有Cu-Al 2 O3纳米复合涂层的铜表面上的池沸腾传热性能，因为这些颗粒具有更高的热导率。纳米复合涂层是通过一步电化学沉积技术开发的。这种技术提供了一个简单的控制表面性能，如孔隙率和涂层厚度。沉积方法进行了仔细研究和负责的表面形貌参数的报告。纳米复合涂层的沸腾传热系数（BHTC）和临界热流密度（CHF）有很大的提高。最大临界热流密度为1852 kW/m2，传热系数为199 kW/m2，比裸表面分别提高了72.5%和273%。与Cu-Al 2 O 3纳米复合材料涂层表面的池沸腾传热增强的机制从事几个效果，如改善表面粗糙度，活化大量的成核位点，增加孔隙率，并改善表面润湿性。
The current growth in nanoscience created a deep space of research for modern technology in the field of energy conservation by reducing the energy dissipation from the energy conversion applications. The boiling heat transfer enhancement is an important and advanced field of research to increase the performance of energy conversion applications. The pool boiling heat transfer performance of saturated DI water at atmospheric pressure is examined experimentally on copper surfaces with Cu-Al2O3 nanocomposite coatings, as these particles have higher thermal conductivity. The nanocomposite coatings are developed by a single-step electrochemical deposition technique. This technique provides an easy control on surface properties like porosity and coating thickness. The deposition method is studied carefully and responsible surface morphology parameters are reported. The boiling heat transfer coefficient (BHTC) and critical heat flux (CHF) are improved considerably for nanocomposite coatings. The maximum critical heat flux of 1852 kW/m(2) and heat transfer coefficient of 199 kW/m(2 )K are found to be 72.5% and 273% higher than that of bare surface, respectively. The mechanism for pool boiling heat transfer enhancement with Cu-Al2O3 nanocomposite coated surfaces engages several effects like improvement in surface roughness, activation of larger number of nucleation sites, increase in porosity, and improved surface wettability.