氧化铝纳米流体临界热流密度机理模型研究——物理模型

Study on Al2O3 Nanofluid Critical Heat Flux Mechanism Model: Physics Models

针对现有纳米流体临界热流密度(CHF)模型存在的不足,基于气泡力平衡分析方法,考虑接触角和毛细现象带来的影响,构建了针对氧化铝纳米流体CHF的机理模型。结果表明:模型可模拟CHF随纳米流体浓度(c_(NF))变化的规律,随着c_(NF)增加,CHF开始增加;但增加至某一浓度之后,CHF不再增加而维持恒定值;模型表明CHF与纳米微粒直径(d0)无关,这与已有实验结果吻合;随着接触角或倾斜角增加,模型计算得到的CHF减小。

In this study, to overcome the shortcomings of the present models, based on the analysis of the force balance of the bubble, considering the contact angle and capillary wicking effects, a Al2O3 nanofluid critical heat flux（CHF） mechanism model is developed. It is shown that, this model can simulate the effect of nanofluid concentration（c（NF）） on CHF, that is, as c（NF） increases, CHF increases at the beginning, and when NFc is greater than a certain value, CHF no longer increases and maintains a constant value, and this model can explain that the diameter of nanoparticle（d0） has no effect on CHF, which are in a good agreement with experimental results. As the contact angle or inclination angle increases, calculated CHF by this model decreases.