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Theoretical and DSMC Studies on Heat Conduction of Gas Confined in a Cuboid Nanopore

机译：立方纳米孔中气体导热的理论和DSMC研究

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摘要

This paper presents a theoretical and numerical study on the heat conduction of gas confined in a cuboid nanopore, in which there exists a temperature difference between the top and bottom walls and the side walls are adiabatic. A modified gas mean free path in confined space is proposed by considering the impact of collisions between molecules and solid surfaces, with which an effective thermal conductivity model of gas in the transition regime is derived. A direct simulation Monte Carlo (DSMC) study on the heat conduction of argon and helium in a cuboid nanopore is carried out to validate the present model. The influences of the Knudsen number and the treatments of boundary conditions on the heat conduction and effective thermal conductivity of gas in nanopores are studied. The temperature jumps and the reduction of heat flux near side walls are analyzed.
机译：本文提出了一种对立方纳米孔中气体的热传导的理论和数值研究，其中顶壁和底壁之间存在温差，而侧壁是绝热的。通过考虑分子与固体表面碰撞的影响，提出了一种修正的气体在密闭空间中的平均自由程，由此推导了气体在过渡态下的有效导热模型。通过直接模拟蒙特卡洛（DSMC）研究长方体纳米孔中氩气和氦气的热传导来验证本模型。研究了克努森数和边界条件的处理对气体在纳米孔中的导热和有效导热率的影响。分析了温度跳跃并分析了侧壁附近热通量的减少。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052405.1-052405.7|共7页
  • 作者

    Chuan-Yong Zhu; Zeng-Yao Li; Wen-Quan Tao;

  • 作者单位

    Key Laboratory of Thermo-Fluid and Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Key Laboratory of Thermo-Fluid and Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    Key Laboratory of Thermo-Fluid and Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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