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液体分子要在液体中作一定程度的偏移,需要克服一个高度为W的势垒,这个势垒就是该液体的活化能,活化能是表征液体本身固有性质的一个物理量,它对液体诸多特性参数都有决定性的作用,本文提出一个估算液体活化能的实验方法--黏滞法,其理论依据是液体的黏滞系数n正比于TekT/W[1],通过实验分别测出几个不同温度下液体的黏滞系数反过来即可估算其活化能. 相似文献
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分析了斯托克斯定律及其修正项的适用范围,讨论了落球法测液体粘滞系数实验中液体粘滞系数和落球直径对雷诺数的影响,从理论上给出了实验中落球进入液体后匀速运动的判据. 相似文献
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针对在"落球法测量液体粘滞系数"的实验中,小球在液体中开始匀速运动的时间和位置很难判定,我们使用Matlab/Simulink仿真软件的虚拟现实(VR)工具箱制作了"落球法测量液体粘滞系数"的演示实验,对蓖麻油中小球的运动规律进行了动态的仿真,并将仿真结果与真实的实验结果进行了比较和分析,这将有助于提高学生对实验结论的认识和理解。 相似文献
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本文利用液体的绝对速度理论得到液体的粘滞系数随温度变化的关系式,在不同的温度下测得液体的粘滞系数,找出液体的粘滞系数随温度变化的数学表达式。 相似文献
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Results previously obtained in molecular dynamics experiment with Lennard-Jones (n−6) (L-J (n−6)) fluid were applied for the determination of viscous and elastic properties of real molecular fluids (shear viscosity coefficient and pressure). Parameters σ and of real liquids (liquid hydrocarbons) were determined by fitting p–ρ–T data of model fluids to experimental p–ρ–T data of real liquids. Using the data obtained in that way, parameters σ and viscous and elastic characteristics of real liquids were determined. The comparison of experimental and calculated viscous and elastic characteristics revealed lesser dependence of viscous properties from n in comparison with elastic properties. 相似文献
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本文提出了一种快速测量液相扩散系数的方法, 该方法以液芯柱透镜作为液相扩散池和成像元件, 利用柱透镜成像过程中特有的折射率空间分辨测量能力, 只需记录一幅瞬态扩散图像, 根据图像的像宽与折射率的对应关系, 基于扩散定律快速计算出液相扩散系数. 实验研究了室温(25℃)下乙二醇和纯水间的扩散过程, 用折射率空间分布法测量了扩散系数, 和其他测量方法得到的结果进行了分析对比, 结果表明:用折射率空间分布法测量液相扩散系数具有数据采集耗时短(~20 ms)、测量速度快(<1 s)、精度高(相对误差<3%)和操作简单的特点, 为快速测定液相扩散系数提供了一种有效的新方法. 相似文献
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K. I. Morozov 《Journal of Experimental and Theoretical Physics》1997,85(4):728-733
Unique capabilities for modeling the bulk motion of one liquid in another arise from the use of droplets made of a magnetic
liquid. In this paper the low-frequency rotational motion of a magnetic droplet suspended in a viscous liquid is investigated.
In this frequency range, the shape of the droplet does not depend on the field frequency and is determined only by its amplitude.
An analytic solution has been found in the Stokes approximation to the problem, which generalizes the classic problem of Jeffrey
to the case of a liquid ellipsoidal particle. This solution makes it possible to determine the velocity field inside and outside
the liquid particle, the moments of the viscous forces acting on the droplet, its coefficient of rotational mobility.
Zh. éksp. Teor. Fiz. 112, 1340–1350 (October 1997) 相似文献
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Anirudh Pradhan Purnima Pandey Kanti Jotania Mahesh Kumar Yadav 《International Journal of Theoretical Physics》2007,46(11):2774-2787
Plane symmetric viscous fluid cosmological models of the universe with a variable cosmological term are investigated. The
viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density whereas the coefficient of shear
viscosity is to be proportional to rate of expansion in the model. We have also obtained a special model in which the shear
viscosity is assumed to be zero. The cosmological constant Λ is found to be a decreasing function of time and a positive which is supported by results from recent supernovae Ia observations.
Some physical and geometric properties of the models are also discussed. 相似文献
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液态金属固有的良好导热性能和很好的流动性能,逐渐受到了工程领域越来越多的重视。但由于液相扩散系数的测量困难,目前未见液态纯铁的自扩散系数报道。本文以液态纯铁正则系综为研究对象,采用分子动力学模拟方法对其自扩散系数进行了模拟分析,研究结果表明液态纯铁自扩散系数随温度增加呈现出了较大的变化,应用自扩散系数与温度存在的Arrhenius关系拟合出了液态纯铁的自扩散系数经验公式,进一步获得了液态纯铁原子的平均自由程计算关系式。 相似文献