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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of flow rate and surface thickness on heat transfer characteristics of two consecutively impinging droplets on a heated surface
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Influence of flow rate and surface thickness on heat transfer characteristics of two consecutively impinging droplets on a heated surface

机译：流速和表面厚度对加热表面上两个连续冲击液滴的传热特性的影响

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摘要

Understanding the droplet-hot wall interaction is crucial in industrial applications such as spray cooling, desalination and refrigeration, and IC engines. The present study focusses on simulations of two consecutively impinging concentric droplets on a heated surface in ambient conditions. A numerical model with fluid-solid coupling is implemented in opensource CFD software OpenFOAM considering contact line evaporation and dynamic contact line motion. The implemented numerical solver is assessed by validating it against the sessile droplet evaporation case available in the literature, followed by in-house experimental results of a single droplet impact. Consequently, the validated solver is used to conduct the simulations of consecutive droplet impingement on a hot surface, considering the droplet flow rate (i.e., the time interval between the two droplets) and surface thickness as parameters. The droplet flow rate is chosen in the order of 10~2 - 10~3 droplets per second (time interval is in the range of 3 - 100 milliseconds), and two variants of the surface thickness of 0.025 and 2 mm are used. The spread and heat transfer dynamics of each droplet are calculated in terms of spread factor, dimensionless input and evaporation heat transfers, respectively, and compared at all parametric conditions. The study reveals that the selected droplet flow rate affects the spread dynamics of the two droplets, resulting in various droplet heat transfer patterns. Moreover, it is observed that a surface with higher thickness results in more droplet heat transfer due to large thermal inertia. The numerical results are in good agreement with theoretical calculations of maximum spread factor and corresponding droplet heat transfer.
机译：了解液滴 - 热壁相互作用在工业应用中至关重要，例如喷雾冷却，海水淡化和制冷，和IC发动机。本研究侧重于在环境条件下加热表面上的两个连续冲击同心液滴的模拟。考虑到接触线蒸发和动态接触线运动，在OpenSource CFD软件OpenFoam中实现了具有流体固体耦合的数值模型。通过验证文献中可获得的无柄液滴蒸发案例来评估所实施的数值求解器，然后进行单滴冲击的内部实验结果。因此，考虑到液滴流速（即，两个液滴之间的时间间隔）和表面厚度作为参数，验证的求解器用于在热表面上进行热表面上的连续液滴冲击的模拟。每秒10〜2-10〜3液滴（时间间隔为3-100毫秒）的液滴流速选择，使用两个表面厚度为0.025和2mm的变体。每个液滴的扩展和传热动力学分别在扩散因子，无量纲输入和蒸发热转移方面计算，并在所有参数条件下进行比较。该研究表明，所选择的液滴流速影响两个液滴的扩展动态，导致各种液滴传热模式。此外，观察到具有较高厚度的表面导致由于大的热惯性引起的液滴热传递。数值结果与最大扩展因子和相应液滴传热的理论计算吻合良好。

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