Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids
Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids
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DOI：
10.1007/s00231-007-0318-8
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发表时间：
2009-05
影响因子：
2.2
通讯作者：
Hyungdae Kim;Moohwan Kim
中科院分区：
文献类型：
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作者：
Hyungdae Kim;Moohwan Kim
池沸腾临界热流密度（CHF）性能的水性纳米流体进行了研究，使用各种纳米颗粒的TiO 2，Al 2 O 3，和SiO 2。使用纳米流体作为工作流体可以显著地增强池沸腾CHF，这被发现强烈地依赖于纳米颗粒的种类以及其浓度。实验后在加热表面上观察到纳米颗粒表面涂层。在所有情况下，纳米颗粒涂覆表面上的纯水的CHF高于纳米流体的CHF。这揭示了使用纳米流体的CHF增强的原因是由于加热器表面被纳米颗粒沉积改性的事实。CHF增强由于纳米颗粒涂层的机制进行了讨论，涉及到表面润湿性，表面粗糙度，和最大毛细芯吸高度的纳米颗粒涂层的表面。
The pool boiling critical heat flux (CHF) performance of aqueous nanofluids was investigated using various nanoparticles of TiO2, Al2O3, and SiO2. The usage of a nanofluid as a working fluid can significantly enhance the pool boiling CHF, which was found to be strongly dependent on the kind of nanoparticle, as well as its concentration. A nanoparticle surface coating was observed on the heating surface after the experiment. The CHF of pure water on the nanoparticle-coated surface was higher than that of nanofluids for all cases. This revealed that the cause of the CHF enhancement using nanofluids is due to the fact that the heater surface is modified by the nanoparticle deposition. The mechanism of CHF enhancement due to the nanoparticle coating was discussed, relating it to surface wettability, surface roughness, and maximum capillary wicking height of the nanoparticle-coated surface.