Nanofluids spray heat transfer enhancement
Nanofluids spray heat transfer enhancement
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DOI：
10.1016/j.ijheatmasstransfer.2015.11.061
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发表时间：
2016-03-01
影响因子：
5.2
通讯作者：
Yeh, Yi-Fan
中科院分区：
文献类型：
--
作者：
Hsieh, Shou-Shing;Liu, Hao-Hsiang;Yeh, Yi-Fan
通过喷雾冷却实验，研究了7种不同类型纳米流体的强化换热效果。对体积分数分别为0.04%、0.07%和0.1%的Ag、Al、Al_2O_3、Fe_3O_4、SiO_2、TiO_2和多壁碳纳米管(MWCNTs)在去离子水中的分散进行了实验研究，并在一个直径为4 cm(2)、厚度为1 cm的铜平板加热器上进行了瞬时和稳态喷雾沸腾实验。雾化高度为30 mm，雾化质量流量为1.5×10~(-3)kg/cm~(2)，雾化高度为270µm，雾化质量流量为1.5×10~(-3)kg/cm~(2)S。结果表明，当纳米流体的体积分数从0.04%增加到0.1%时，纳米流体的平均换热系数(HTC)和相应的临界热流密度(CHF)都得到了显著的提高，对应于DI水，平均换热系数(HTC)和临界热流密度(CHF)分别达到了1.7(HTC)和1.84(CHF)。(C)2015爱思唯尔有限公司。保留所有权利。
Spray cooling experiments were carried out to study the effect of seven (7) different types of nanofluids on heat transfer enhancement. Three different concentrations of 0.04%, 0.07%, and 0.1% by volume of Ag, Al, Al2O3, Fe3O4, SiO2, TiO2 and multi-walled carbon nanotubes (MWCNTs) dispersed with deionized (DI) water were tested, and transient as well as steady spray boiling experiments were conducted over a copper flat plate heater 4 cm(2) in size with a 1 cm thickness. The spray was issued by a 270 mu m full-cone nozzle with a spray height of 30 mm and a spray mass flux of 1.5 x 10(-3) kg/cm(2) s. Both a transient cooling curve and steady boiling curve were obtained. The results revealed that the average heat transfer coefficient (HTC), as well as the associated critical heat flux (CHF), are significantly enhanced, and the enhancement ratio can be up to 1.7 (HTC) and 1.84 (CHF), respectively, corresponding to the DI water as the nanofluids' volume fraction increased from 0.04% to 0.1%. (C) 2015 Elsevier Ltd. All rights reserved.