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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation of gas-surface scattering dynamics on the rarefied gas flow through a planar channel caused by a tangential temperature gradient
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Numerical investigation of gas-surface scattering dynamics on the rarefied gas flow through a planar channel caused by a tangential temperature gradient

机译：切向温度梯度引起的稀薄气体流经平面通道的气体表面散射动力学的数值研究

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摘要

A numerical analysis of the rarefied gas flow caused by a temperature gradient in the direction tangential to a wall through a planar channel of finite length is carried out based on the nonlinear Shakhov model of the Boltzmann kinetic equation. The Maxwell diffuse and Cercignani-Lampis gas-surface interaction models are provided as a boundary condition at solid walls. An implicit scheme for solution of the S-model kinetic equation was applied and the algorithm has been optimized for the use of massive par-allelization in both physical and velocities spaces. The competition between rarefaction, gas-surface scattering model and temperature gradient effects on a gas flow is discussed in terms of both mass flow rate and streamwise heat flux. A comparison with available literature results has been carried out and showed a good agreement. It was found that the temperature gradient as well as the gas-surface scattering dynamics play a significant role for the highly rarefied gas flow, beginning from the transition flow regime. At the same time, under certain gas-surface scattering conditions a change of the value of temperature gradient does not affect the heat flux. For the weakly rarefied flow the temperature gradient effect on the mass flow rate is small for any gas-surface scattering condition, while the heat flux does not depend neither on value of temperature gradient nor choice and details of gas-surface scattering dynamics.
机译：基于玻尔兹曼动力学方程的非线性Shakhov模型，对通过有限长度的平面通道与壁相切的方向上的温度梯度引起的稀薄气体流动进行了数值分析。麦克斯韦扩散和切尔西尼亚尼-兰皮斯气体-表面相互作用模型作为边界条件提供在实心壁上。应用了求解S模型动力学方程的隐式方案，并对算法进行了优化，以在物理和速度空间中均使用大规模并行化。讨论了稀薄度，气体表面散射模型和温度梯度对气流的影响，同时从质量流率和流向热通量两方面进行了讨论。与现有文献结果进行了比较，并显示出良好的一致性。已经发现，从过渡流动状态开始，温度梯度以及气体表面的散射动力学对高度稀薄的气流起着重要的作用。同时，在某些气体表面散射条件下，温度梯度值的变化不会影响热通量。对于稀薄流，对于任何气体表面散射条件，温度梯度对质量流量的影响都很小，而热通量既不取决于温度梯度的值，也不取决于气体表面散射动力学的选择和细节。

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