Knudsen number
英
美 [ˈknudsən ˈnʌmbər]
n. 克努森数
双语例句
- By adjust the momentum coefficient and thermal coefficient, the two important parameters in boundary conditions, the new model is valid as long as the Knudsen number is less than 1.2.
通过调整边界条件中的重要参数切向动量协调系数σv和热量协调系数tσ的值，可以将新建模型的应用范围扩大到克努森数Kn<1.2的稀薄气体流动中。 - It is different with the traditional DVM. And comparing this model with theory analysis and numerical solution, in the low speed flow, it shows excellent agreement when Knudsen number from slip region to transfer region.
将这种模型与数值模拟和理论分析结果的对比表明，离散模型不仅能够模拟低速流动问题，而且还能够模拟Knudsen数从滑移领域到过渡领域内的气体流动，并且计算速度快。 - When the Knudsen number is between 10~ (-3) and 10~ (-1), the gas rarefaction effect causes relative slip of flow and jump of temperature to the tube wall.
当Knudsen数处于10-3和1-01之间时，稀薄效应造成气体与管壁面间的相对滑移和温度跳跃。 - And further the effects of Knudsen number, Prandtl number, thermal conductivity, thermal accommodation coefficient and gas pressure on the gas gap conductance are discussed, which provides the quantitatively theoretical solutions to the interfacial gap gas heat transfer in the real contact conditions.
并对影响接触界面间隙热导的克努森数、普朗特数、热导率、适应系数、压力等参数进行了分析，为实际情况下接触界面的传热提供了理论基础。 - In addition, the application of LBE to the microscopic gas flows still has two critical problems, that is, the relation between relaxation time and Knudsen number, another is the boundary treatment of LBE.
另外，在微尺度传热传质问题的研究中，LBM刚刚起步，还存在两个关键问题需要解决，即松弛时间与Knudsen数之间的关系以及LBM的边界处理问题。 - We get its initial layer solutions and boundary layer solution for small knudsen number.
又从正规解出发得到了没有久期项的初始层解并讨论了具有小knudsen数的边界层解。 - The reference Knudsen number is defined for micro gas journal bearings and its value range is obtained according to the viscosity data of air at different temperatures.
针对微气体轴承给出参考努森数的定义，根据空气不同温度时的黏度，得到参考努森数的分布范围； - Considering the general nonlinear Boltzmann equation, a uniform algorithm has been developed to simulate rarified flows at a wide Knudsen number range numerically.
从一般非线性Boltzmann方程出发，发展并实现了一套适于大范围Knudsen数稀薄流问题数值模拟的统一算法。 - The numerical results show that the kinetic BGK with slip boundary condition can obtain the drag coefficient, which is well agreement with the experimental data till Knudsen number up to 0.3, and can simulate the continuum-transition flow.
计算结果表明：采用滑移边界条件，直到克努森数为0.3，计算得到的阻力与实验都符合得很好。因此，采用BGK算法加滑移边界条件，能够模拟由连续流到近连续区的流动。 - The Knudsen number is defined as the ratio of the macroscopic length scale ( hydrodynamic wave-length) to the microscopic one ( mean free path).
Knudsen数的定义是：宏观的特征长度与微观特征长度（一般为平均自由程）之比。