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首页> 外文期刊>International Journal of Heat and Mass Transfer >Interfacial temperature measurements, high-speed visualization and finite-element simulations of droplet impact and evaporation on a solid surface
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Interfacial temperature measurements, high-speed visualization and finite-element simulations of droplet impact and evaporation on a solid surface

机译：界面温度测量，高速可视化以及液滴在固体表面上的撞击和蒸发的有限元模拟

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摘要

The objective of this work is to investigate the coupling of fluid dynamics, heat transfer and mass transfer during the impact and evaporation of droplets on a heated solid substrate. A laser-based thermoreflec-tance method is used to measure the temperature at the solid-liquid interface, with a time and space resolution of 100 μs and 20 μm, respectively. Isopropanol droplets with micro- and nanoliter volumes are considered. A finite-element model is used to simulate the transient fluid dynamics and heat transfer during the droplet deposition process, considering the dynamics of wetting as well as Laplace and Marangoni stresses on the liquid-gas boundary. For cases involving evaporation, the diffusion of vapor in the atmosphere is solved numerically, providing an exact boundary condition for the evaporative flux at the droplet-air interface. High-speed visualizations are performed to provide matching parameters for the wetting model used in the simulations. Numerical and experimental results are compared for the transient heat transfer and the fluid dynamics involved during the droplet deposition. Our results describe and explain temperature oscillations at the drop-substrate interface during the early stages of impact. For the first time, a full simulation of the impact and subsequent evaporation of a drop on a heated surface is performed, and excellent agreement is found with the experimental results. Our results also shed light on the influence of wetting on the heat transfer during evaporation.
机译：这项工作的目的是研究液滴在加热的固体基质上的撞击和蒸发过程中的流体动力学，传热和传质的耦合。基于激光的热反射法用于测量固液界面的温度，时间和空间分辨率分别为100μs和20μm。考虑了微升和纳升体积的异丙醇液滴。考虑到湿气以及液-气边界上的拉普拉斯应力和马兰戈尼应力的动力学，使用有限元模型来模拟液滴沉积过程中的瞬态流体动力学和传热。对于涉及蒸发的情况，通过数值方法解决了蒸气在大气中的扩散，从而为液滴-空气界面处的蒸发通量提供了精确的边界条件。执行高速可视化以为仿真中使用的润湿模型提供匹配参数。比较了瞬态传热和液滴沉积过程中涉及的流体动力学的数值和实验结果。我们的结果描述并解释了在冲击初期，液滴与基材界面的温度波动。首次对液滴在加热表面上的撞击和随后的蒸发进行了完全模拟，并且与实验结果非常吻合。我们的结果也揭示了润湿对蒸发过程中热传递的影响。

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