Optimum concentration of nanofluids for heat transfer enhancement under cavity flow natural convection with TiO2 – Water
Optimum concentration of nanofluids for heat transfer enhancement under cavity flow natural convection with TiO2 – Water
复制标题
TiO2-水腔流自然对流下强化传热的纳米流体最佳浓度
DOI：
10.1016/j.icheatmasstransfer.2018.09.010
复制
发表时间：
2018
影响因子：
7
通讯作者：
J. Meyer
中科院分区：
文献类型：
--
作者：
M. Sharifpur;A. Solomon;Tanja Linda Ottermann;J. Meyer
研究的目的是利用一个对壁加热和冷却、其他壁绝缘的方形腔体，确定自然对流过程中纳米流体的最佳浓度。在实验研究中，使用二氧化钛和水的混合物作为纳米流体。纳米流体由平均尺寸为50 nm的纳米颗粒组成。通过改变加热和冷却壁面的温度以及纳米流体的体积分数来研究它们对传热的影响。纳米流体的体积分数在0.05 ~ 0.8 Vol%之间变化，在4.9 × 108 ~ 1.47 × 109之间变化。从本研究可知，二氧化钛纳米颗粒的加入增强了换热，并发现存在最大换热的最佳浓度。当体积浓度为0.05%时，传热增强幅度最大，为8.2%。
The purpose of the research is to identify the optimum concentration of nanofluid during natural convection process using a square cavity with opposite walls heated and cooled, and all other walls are insulated. In the experimental investigation, the mixture of titanium dioxide and water is used as a nanofluid. The nanofluid consist of nanoparticles with the average size of 50 nm. The temperature of the heated and cooled walls, as well as the volume fraction of the nanofluid, are varied to investigate their effects on the heat transfer. The volume fraction of the nanofluids was varied from 0.05 Vol% to 0.8 Vol%, and theRain this study was from 4.9 × 108to 1.47 × 109. From this study, it is understood that the addition of titanium dioxide nanoparticles enhances the heat transfer and also found that there is an optimum concentration for maximum heat transfer. The maximum heat transfer enhancement of 8.2% is found at a volume concentration of 0.05%.