Sessile Droplet Evaporation on Wall with Radial Temperature Gradient

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-05-01 DOI:10.47176/jafm.17.05.2193

Z. G. Lei, C. Q. Shen, C. C. Song, F. Yao, X. D. Liu

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引用次数: 0

Abstract

Droplet evaporation coupled with gravity and surface tension on a wall with the radial temperature gradients is numerically studied with the arbitrary Lagrangian‒Eulerian method. The influence of the wall temperature distribution on the droplet evaporation process, which is less considered in the existing literature, is mainly discussed. The droplet temperature coefficient of the surface tension and the viscosity on the droplet profile evolution, flow, heat and mass transfer characteristic are also discussed. The results indicate that the droplets become flat first and then retract under the gravity and Marangoni convection during droplet evaporation. There are two high-velocity regions inside the evaporating droplet. One region is at the droplet axis, in which fluid flows to the wall from the droplet top. The other region is near the droplet surface, where fluid flows to the droplet top. There are turning points on the two sides of which the influence of wall temperature distribution on the ratio between the droplet height and the radius of the three-phase contact line ( h / R c ), the velocity in the droplet and the surface temperature converts. All of them are larger before the turning point when the wall temperature slope is

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有径向温度梯度的壁上无水微滴蒸发

采用任意拉格朗日-欧勒方法对具有径向温度梯度的壁面上与重力和表面张力耦合的液滴蒸发进行了数值研究。主要讨论了现有文献较少考虑的壁面温度分布对液滴蒸发过程的影响。此外，还讨论了液滴温度系数、表面张力和粘度对液滴剖面演变、流动、传热和传质特性的影响。结果表明，在液滴蒸发过程中，液滴在重力和马兰戈尼对流作用下先变平后回缩。蒸发液滴内部有两个高速区域。一个区域位于液滴轴线处，液体从液滴顶部流向液滴壁。另一个区域靠近液滴表面，液体流向液滴顶部。两侧存在转折点，转折点上的壁面温度分布对液滴高度与三相接触线半径之比（h/R c）、液滴内速度和表面温度的影响发生了转换。在转折点之前，当壁温斜率为

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .