Li Shengji, Yang Qianmei, Ye Linhui, Du Hongzhe, Zhang Zhenzhong, Huang Xuefeng, Xu Jiangrong
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Institute of Energy, Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China.
ACS Omega. 2022 Jan 17;7(4):3284-3292. doi: 10.1021/acsomega.1c05343. eCollection 2022 Feb 1.
-Decane-based nanofluid fuels could be one of the most promising alternative fuels as aviation kerosene for aerospace application. However, the physical and heat-transfer properties of -decane-based nanofuels have been rarely studied, and the influence of the concentration of nanoparticles on the evaporation characteristics of -decane-based fuels has been sparsely investigated. This paper investigated physical and heat-transfer properties and evaporation characteristics of graphite/-decane nanofluid fuels and emphasized the concentration effect of adding graphite nanoplatelets (GNPs) on these characteristics. It was found that there are a linear increase of density and thermal conductivity, a binomial increase of viscosity, and a binomial influence on surface tension as GNP concentration increases, while the boiling point almost remains constant, and the latent heat of vaporization largely decays. There exists a critical GNP concentration of 1.75 wt % for the evaporation performance. At 0∼1.75 wt %, the increase of GNP concentration benefits the evaporation. At 1.75∼4.0 wt %, the enhancement of GNP concentration deteriorates the evaporation performance. A detailed discussion of this evaporation behavior was made, which could be attributed to multiple factors, for example, the aggregation of nanoplatelets, the changes of physical and heat-transfer properties owing to the nanoparticle concentration effect, the surfactant concentration, and the ambient temperature. The concentration of surfactants has a binomial effect, and the ambient temperature has a linear effect on the evaporation rate. This study would promote in depth understanding of physical and heat-transfer properties and evaporation characteristics of nanofluid fuels and develop the application in turbine engines and ramjet engines.
基于癸烷的纳米流体燃料可能是航空航天应用中最有前途的替代燃料之一，可替代航空煤油。然而，基于癸烷的纳米燃料的物理和传热特性鲜有研究，纳米颗粒浓度对基于癸烷的燃料蒸发特性的影响也鲜有探讨。本文研究了石墨/癸烷纳米流体燃料的物理和传热特性以及蒸发特性，并着重研究了添加石墨纳米片（GNPs）的浓度对这些特性的影响。研究发现，随着GNP浓度的增加，密度和热导率呈线性增加，粘度呈二次方增加，表面张力受到二次方影响，而沸点几乎保持不变，汽化潜热大幅下降。蒸发性能存在一个临界GNP浓度为1.75 wt%。在0∼1.75 wt%时，GNP浓度的增加有利于蒸发。在1.75∼4.0 wt%时，GNP浓度的增加会使蒸发性能变差。对这种蒸发行为进行了详细讨论，这可能归因于多种因素，例如纳米片的聚集、由于纳米颗粒浓度效应导致的物理和传热特性的变化、表面活性剂浓度以及环境温度。表面活性剂浓度有二次方效应，环境温度对蒸发速率有线性效应。本研究将促进对纳米流体燃料的物理和传热特性以及蒸发特性的深入理解，并推动其在涡轮发动机和冲压发动机中的应用。
