排序方式: 共有10条查询结果,搜索用时 46 毫秒
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提出应用化学势与压强的关系曲线分析曲面气液两相的相平衡及物质质量转移问题的方法.通过曲线描述,提供了关于相平衡、弯曲液面饱和蒸气压以及蒸发、凝结等规律比较直观的物理图像. 相似文献
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刘建林 《Acta Mechanica Sinica》2010,26(2):217-223
The stiction of a thin plate induced by the capillary force has attracted much attention in the broad range of applications. A novel method is presented to calculate the capillary adhesion problem of the plate through analytical method. The expressions of the surface energy, the strain energy and the total potential energy of the plate-substrate system have been analyzed and delineated. By means of continuum mechanics and the principle of minimum potential energy, the governing equation of the plate with an arbitrary shape and the corresponding transversality boundary condition due to the moving bound have been derived. Then the critical adhesion radius of the circular plate has been solved according to the supplementary transversality condition. Thus the deflections of the plates are analytically calculated with different critical adhesion radii. The results may be beneficial to the engineering application and the micro/nanomeasurement. 相似文献
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高速滚动轴承内圈和保持架等旋转运动件表面润滑油膜的流动铺展以及破碎为油带和油矢的特性决定着轴承的润滑与冷却状态.在获得轴承旋转运动件拓扑结构—旋转圆盘表面油膜稳态流动特性的基础上,利用力学平衡和液体表面波不稳定破碎理论,建立表面油膜破碎转捩为油带和油矢的临界特性分析模型,分析和探讨了表面油膜的稳态流动特性以及供油量和润滑油物理特征参数对油膜破碎转捩临界特性的影响.结果表明:表面油膜沿着圆盘径向逐渐变薄,因与圆盘表面存在滑移现象,其流动速度也随之减小;表面油膜破碎的临界波数和临界半径随着圆盘转速的增高而增大,临界厚度则随之减小;表面油膜破碎的临界半径和临界厚度随着润滑油供油量的增加而增大;增大润滑油密度,将延缓表面油膜破碎,破碎临界半径增大,临界厚度减小;增大润滑油的黏度和表面张力系数将促进表面油膜破碎,破碎临界半径减小.与相关的试验结果对比验证了理论分析方法的正确性和可靠性. 相似文献
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用热力学方法证明了壁面上球冠形液滴的内外压差同样遵循经典的Laplace方程,并用力学方法给予了验证.液滴的内外压差与固液接触角无关,只取决于液体的表面张力和液滴半径;液滴的临界半径也与接触角无关,其值可用经典的Kalvin公式计算
关键词:
滴状冷凝
液滴
压差
临界半径 相似文献
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The analytical transfer matrix method (ATMM) is applied to
calculating the critical radius $r_{\rm c}$ and the dipole
polarizability $\alpha_{\rm d}$ in two confined systems: the hydrogen
atom and the Hulth\'{e}n potential. We find that there exists a
linear relation between $r_{\rm c}^{1/2}$ and the quantum number $n_{r}$
for a fixed angular quantum number $l$, moreover, the three bounds
of $\alpha_{\rm d}$ ($\alpha_{\rm d}^{K}$, $\alpha_{\rm d}^{B}$,
$\alpha_{\rm d}^{U}$) satisfy an inequality:
$\alpha_{\rm d}^{K}\leq\alpha_{\rm d}^{B}\leq\alpha_{\rm d}^{U}$. A comparison
between the ATMM, the exact numerical analysis, and the variational
wavefunctions shows that our method works very well in the systems. 相似文献
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In this paper, we prove that if M is an open manifold with nonnegative Ricci curvature and large volume growth, positive critical radius, then sup Cp=∞.p∈M As an application, we give a theorem which supports strongly Petersen‘s conjecture. 相似文献
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