Mechanism chaotic movement of Leidenfrost droplets

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-07-28 DOI:10.1016/j.expthermflusci.2024.111277
Boris Kichatov, Alexey Korshunov, Vladimir Sudakov
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Abstract

One of the most effective methods for cooling overheated surfaces is drip irrigation. If the surface temperature exceeds the Leidenfrost temperature, then a vapor film is formed between the droplet and the surface, which leads not only to a decrease in heat transfer intensity but also causes droplet mobility. For a number of applications, the mobility of droplets is an undesirable phenomenon, so the analysis of the factors responsible for their movement is a relevant task. Here we analyze the movement mechanism of the Leidenfrost droplets with variations in the composition and volume of the droplets. The data obtained show that the droplet speed increases with an increase in the droplet volume. However, smaller droplets change direction of motion more often than larger droplets. To substantiate the experimental data, a hypothesis is proposed, according to which the mechanism of movement of Leidenfrost droplets is caused by the reactive force that arises due to the evaporation of liquid. A Leidenfrost droplet changes the direction of its movement due to the deformation of its surface under the influence of gravity and capillary force. To substantiate the experimental data a simple phenomenological model is proposed.

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Leidenfrost 液滴的混乱运动机制
滴灌是冷却过热表面的最有效方法之一。如果表面温度超过莱顿弗罗斯特温度,那么液滴和表面之间就会形成一层蒸汽膜,这不仅会导致传热强度降低,还会造成液滴流动。在许多应用中,液滴的流动性是一种不良现象,因此分析导致液滴流动的因素是一项重要任务。在此,我们分析了莱顿弗罗斯特液滴在液滴成分和体积发生变化时的移动机制。获得的数据表明,液滴速度随着液滴体积的增大而增加。然而,较小的液滴比较大的液滴更频繁地改变运动方向。为了证实实验数据,我们提出了一个假设,即莱顿弗罗斯特液滴的运动机理是由液体蒸发产生的反作用力引起的。莱顿弗罗斯特液滴在重力和毛细力的作用下,由于表面变形而改变运动方向。为了证实实验数据,我们提出了一个简单的现象学模型。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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