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首页> 外文期刊>Applied Surface Science >Modeling and experimental analysis of thermocapillary effect on laser grooved surfaces at high temperature
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Modeling and experimental analysis of thermocapillary effect on laser grooved surfaces at high temperature

机译：高温下激光刻纹表面热毛细管效应的建模与实验分析

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摘要

Spreading behaviors of oil on laser grooved stainless steel 316L surfaces were studied theoretically and experimentally at high temperature with consideration of thermocapillary effect. A mathematic model of droplet spreading on grooved surfaces was developed taking into account of thermocapillary, groove capillary, thermal viscous effect and surface tension. Then, numerical analysis and experiments were carried out on laser grooved surfaces with different temperature gradient and change of droplet center temperature from 24 to 200 degrees C accordingly. It was shown that the present model agreed well with the experiment in predicting oil droplet thermocapillary spreading. The initial acceleration phase of oil spreading was proved more and more significant with temperature gradient increasing, producing maximum velocity form 5.8 to 15.93 mm/s with the increasing of temperature gradient from 0 to 3.72 degrees C/mm. Besides, the oil spreading in the opposite direction of temperature gradient was faster than that in the direction of temperature gradient, and the distance difference increased form 0.06 mm to 1.16 mm with the increasing of temperature gradient from 0.45 to 2.12 degrees C/mm after 1 s spreading, which illustrated that thermocapillary effect was gradually weakened with the corresponding temperature rising. Further, oil thermal viscous effect was proved as the main reason for this weakening. Groove capillary should be the active force for the directional spreading and even directing oil to high temperature regions, especially under high temperature gradient conditions.
机译：考虑到热毛细效应，理论和实验研究了油在激光开槽的316L不锈钢表面上的扩散行为。考虑到热毛细管，沟槽毛细管，热粘性效应和表面张力，建立了液滴在沟槽表面上扩散的数学模型。然后，对具有不同温度梯度的激光开槽表面进行了数值分析和实验，并相应地将液滴中心温度从24摄氏度更改为200摄氏度。结果表明，该模型与预测油滴热毛细扩散的实验吻合良好。随着温度梯度的增加，油扩散的初始加速阶段变得越来越重要，随着温度梯度从0到3.72摄氏度/毫米的增加，产生的最大速度从5.8到15.93 mm / s。此外，在温度梯度相反的方向上扩散的油比在温度梯度的方向上扩散的油快，并且随着温度梯度从0.45摄氏度增加到2.12摄氏度/毫米，距离差从0.06毫米增加到1.16毫米。扩散，说明随着温度的升高，热毛细作用逐渐减弱。此外，事实证明，油的热粘性效应是这种减弱的主要原因。沟槽毛细管应该是定向扩散甚至将油引导至高温区域（特别是在高温梯度条件下）的作用力。

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