物理化学学报 >> 2012, Vol. 28 >> Issue (12): 2939-2943.doi: 10.3866/PKU.WHXB201209042

催化和表面科学 上一篇    下一篇

表面电荷及外电场对液固界面热阻的影响

葛宋, 陈民   

  1. 清华大学工程力学系, 北京 100084
  • 收稿日期:2012-07-29 修回日期:2012-09-03 发布日期:2012-11-14
  • 通讯作者: 陈民 E-mail:mchen@tsinghua.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(973)(2009CB219805)及国家自然科学基金(51076078)资助

Effects of Surface Charge and Electric Field on the Interfacial Thermal Resistance at Liquid/Solid Interfaces

GE Song, CHEN Min   

  1. The effect of an applied electric field and the surface charge on the interfacial thermal resistance between water and solid has been studied using nonequilibrium molecular dynamics simulations. The results reveal that the electric field decreases the water-solid interfacial thermal resistance when it is perpendicular to the interface. However, it shows that the electric field has a negligible effect on the thermal resistance when it is parallel to the interface. Both positively and negatively charged surfaces decrease the interfacial thermal resistance. The relationship between the interfacial thermal resistance and the surface charge density and electric field strength is a quadratic function. This study demonstrates that applying an external electric field or a surface charge are effective ways of manipulating the interfacial thermal resistance.
  • Received:2012-07-29 Revised:2012-09-03 Published:2012-11-14
  • Supported by:

    The project was supported by the National Key Basic Research Program, China (973) (2009CB219805) and National Natural Science Foundation of China (51076078)

摘要:

采用非平衡分子动力学方法模拟了外电场及固体表面电荷对水与固体间界面热阻的影响. 结果表明,外加电场平行于界面时, 其对界面热阻几乎没有影响, 而垂直于界面时, 界面热阻将随着电场强度的增大而减小. 壁面带正电荷或负电荷都将使得界面热阻减小. 界面热阻与表面电荷密度及电场强度均满足二次函数关系. 模拟结果表明施加外电场和表面电荷是控制液固界面热阻的有效方法.

关键词: 表面电荷, 外电场, 液固界面, 界面热阻, 分子动力学模拟

Abstract:

Effects of electric field and surface charge on the interfacial thermal resistance between water and solid are discussed by using nonequilibrium molecular dynamics simulation. The results reveal that the electric filed decreases the water-solid interfacial thermal resistance when it is perpendicular to the interface. However, it shows negligible effects on the thermal resistance when parallel to the interface. Both positively and negatively charged surfaces decrease the interfacial thermal resistance. The relation between the interfacial thermal resistance and the surface charge density or electric field strength follows the quadratic function. The study demonstrates that applying external electric field or surface charge is an effective method to manipulate the interfacial thermal resistance.

Key words: Surface charge, External electric field, Liquid/solid interface, Interfacial thermal resistance, Molecular dynamics simulation

MSC2000: 

  • O647