微结构及温度耦合下的微通道纳米气泡滑移效应

doi:10.3901/JME.2022.11.249

机械工程学报 ›› 2022, Vol. 58 ›› Issue (11): 249-259.doi: 10.3901/JME.2022.11.249

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微结构及温度耦合下的微通道纳米气泡滑移效应

戴双武^1,2, 卢艳^1,2

1. 武汉科技大学冶金装备及其控制教育部重点实验室武汉 430081;
2. 武汉科技大学机械传动与制造工程湖北省重点实验室武汉 430081

收稿日期:2021-01-04 修回日期:2022-03-07 出版日期:2022-06-05 发布日期:2022-08-08
通讯作者: 卢艳(通信作者),女,1984年出生,博士,教授,博士研究生导师。主要研究方向为摩擦学和表面工程。E-mail:yanlu@wust.edu.cn
作者简介:戴双武,男,1995年出生。主要研究方向为摩擦学理论。E-mail:daishuangwu@wust.edu.cn
基金资助:
国家自然科学基金（51875417，51975425）和国家重点研发计划（2021YFB2011200）资助项目

Slip Effect of Microchannel Nanobubbles under the Coupling of Microstructure and Temperature

DAI Shuangwu^1,2, LU Yan^1,2

1. Key Laboratory of Metallurgical Equipment and Control, Wuhan University of Science and Technology, Wuhan 430081;
2. Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081

Received:2021-01-04 Revised:2022-03-07 Online:2022-06-05 Published:2022-08-08

摘要/Abstract

摘要： 通过分子动力学（MD）模拟研究纳米气泡的成核，以探究微结构耦合温度因素在仅由简单伦纳德·琼斯流体组成的三元（固体，液体，气体）系统中起到的作用。首先该模型揭示了静态流体中温度耦合结构影响下，纳米气泡的成核特征，其次研究了纳米气泡在动态滑移起到的作用。结果显示：首先温度对纳米气泡的成核以及高度具有显著影响，一定程度增加系统温度，促进了纳米气泡成核，然后高于一定温度时成核受到限制，同时纳米气泡高度随温度的增加而降低。其次纳米凹槽尺寸以及相对位置改变对于气泡成核具有重要意义。保持系统温度不变以及凹槽相对位置不变，逐渐增加凹槽深度时，气体更容易在凹槽内聚集从而形成气泡，并且气泡高度会随之减小；当仅增加凹槽之间相对位置时，纳米气泡的覆盖范围会被拉长，相应地，纳米气泡高度也会随之减小；另外，由于纳米气泡的存在，纳米通道内流体流动性能以及界面滑移现象也会发生改变。

关键词: 分子动力学, 气泡核化, 纳米通道, 纳米凹槽

Abstract: Molecular dynamics (MD) simulation is used to study the nucleation of nanobubbles to explore the role of microstructure coupling temperature factors in a ternary system consisting of simple Leonard Jones fluids(solid, liquid, gas). First, the model reveals the nucleation and height changes of nanobubbles under the influence of the temperature-coupling structure in the static fluid. Second, it studies the role of nanobubbles in dynamic slippage. The results show that firstly, temperature has a significant effect on the nucleation and height of nanobubbles. Increasing the system temperature to a certain extent promotes the nucleation of nanobubbles. Above a certain temperature, bubble nucleation is limited, and the height of nanobubbles decreases with increasing temperature. Secondly, The changes in the size and relative position of the nanogrooves are of great significance for bubble nucleation. Keeping the system temperature and the relative position of the groove unchanged, the increase of the groove depth promotes the formation of bubbles. In addition, due to the existence of nanobubbles, the fluid flow properties in the nanochannel and the interface slip phenomenon will change.

Key words: molecular dynamics, bubble nucleation, nanochannel, nanogroove

中图分类号:

TK124

戴双武, 卢艳. 微结构及温度耦合下的微通道纳米气泡滑移效应[J]. 机械工程学报, 2022, 58(11): 249-259.

DAI Shuangwu, LU Yan. Slip Effect of Microchannel Nanobubbles under the Coupling of Microstructure and Temperature[J]. Journal of Mechanical Engineering, 2022, 58(11): 249-259.

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微结构及温度耦合下的微通道纳米气泡滑移效应

Slip Effect of Microchannel Nanobubbles under the Coupling of Microstructure and Temperature

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