In order to reveal the effect of substrate microstructure on heat transfer of nanofluid droplet evaporation, the thermocapillary flow characteristics and heat transfer performance of nanofluid droplet on different substrates are investigated. The two-phase mixture model is used to simulate the nanofluid flow, and three kinds of micro-structured substrates (namely, sawtooth, rectangle, and parabola structures) are considered. The computational results show that micro-structured substrate can affect the temperature and flow field distributions inside the droplet, and the petal structure of isotherm and flow velocity of smooth substrate is larger than that with micro-structured substrates. The average heat flux at droplet surface increases with substrate temperature increasing, the average heat flux with rectangle substrate is larger than smooth substrate, while that of sawtooth and parabola substrate is smaller. With the increase of nanoparticle volume fraction the average heat flux at droplet surface almost increases linearly.

为了揭示基底微结构对纳米流体液滴蒸发传热的影响，研究了纳米流体液滴在不同基底上的热毛细管流动特性和传热性能。使用两相混合模型来模拟纳米流体的流动，并考虑了三种微结构的衬底（即，锯齿形，矩形和抛物线结构）。计算结果表明，微结构化基体会影响液滴内部的温度和流场分布，等温线的花瓣结构和光滑基体的流速大于微结构化基体。液滴表面的平均热通量随基材温度的升高而增加，矩形基板的平均热通量大于光滑基板的平均热通量，而锯齿和抛物线基板的平均热通量较小。随着纳米颗粒体积分数的增加，液滴表面的平均热通量几乎呈线性增加。