Sticky hard spheres beyond the Percus-Yevick approximation.

Sticky hard spheres beyond the Percus-Yevick approximation.
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DOI:
10.1103/physreve.48.4599
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发表时间:
1993-12
期刊:
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
影响因子:
--
通讯作者:
Yuste;Santos
Yuste;Santos
中科院分区:
其他
文献类型:
--
作者:
Yuste;Santos

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本文通过假定与r_g(r)的拉普拉斯变换有关的函数的有理函数形式,得到了粘硬球流体的径向分布函数g(r),它与接触点处的有限y(r)= g(r)e~i“l~ s和有限等温压缩性条件相容。在最近的一篇论文[S。Bravo Yuste和A.桑托斯,J. Stat.物理72,703(1993)],我们已经表明,最简单的有理函数近似,即Pade近似(2,3),导致巴克斯特的精确解的Percus-Yevick方程。在这里,我们考虑下一个近似,即Pade近似(3,4),并通过在接触点处施加y(r)值和等温压缩系数值来确定两个新参数。与Monte Carlo模拟结果的比较表明,Percus-Yevick近似的显着改善。
The radial distribution function g(r) of a sticky-hard-sphere fiuid is obtained by assuming a rational-function form for a function related to the Laplace transform of rg(r), compatible with the conditions of finite y(r) = g(r)e~i"l~ "s at contact point and finite isothermal compressibility. In a recent paper [S. Bravo Yuste and A. Santos, J. Stat. Phys. 72, 703 (1993)] we have shown that the simplest rational-function approximation, namely, the Pade approximant (2,3), leads to Baxter s exact solution of the Percus-Yevick equation. Here we consider the next approximation, i.e. , the Pade approximant (3,4), and determine the two new parameters by imposing the values of y(r) at contact point and of the isothermal compressibility. Comparison with Monte Carlo simulation results shows a significant improvement over the Percus-Yevick approximation.