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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nanofluids spray heat transfer enhancement
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Nanofluids spray heat transfer enhancement

机译：纳米流体喷雾传热增强

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摘要

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, Al_2O_3, Fe_3O_4, SiO_2, TiO_2 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 cm2 in size with a 1 cm thickness. The spray was issued by a 270 μm full-cone nozzle with a spray height of 30 mm and a spray mass flux of 1.5 × 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%.
机译：进行喷雾冷却实验以研究七（7）种不同类型的纳米流体对增强传热的影响。测试了三种浓度分别为0.04％，0.07％和0.1％的Ag，Al，Al_2O_3，Fe_3O_4，SiO_2，TiO_2和分散有去离子（DI）水的多壁碳纳米管（MWCNT）的浓度，并进行了瞬态分析在4平方厘米，厚1厘米的铜平板加热器上进行了稳定的喷雾沸腾实验。喷雾是通过一个270μm的全锥形喷嘴进行的，喷雾高度为30 mm，喷雾质量通量为1.5×10〜（-3）kg / cm〜2 s。获得了瞬时冷却曲线和稳定沸腾曲线。结果表明，平均传热系数（HTC）以及相关的临界热通量（CHF）显着提高，并且增强率分别可以达到1.7（HTC）和1.84（CHF），分别对应当纳米流体的体积分数从0.04％增加到0.1％时，去离子水的浓度也随之增加。

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