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arXiv 1401.3549cond-mat.softcond-mat.stat-mechphysics.chem-ph
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粘硬球流体状态方程的化学势方法

Equation of state of sticky-hard-sphere fluids in the chemical-potential route

René D. Rohrmann, Andrés Santos

摘要:

耦合参数方法,其中一个额外的粒子是逐步耦合到其余的粒子,被施加到粘性硬球流体,以获得其状态方程在所谓的化学势路线($μ$路线)。作为一致性检验,一维粘性颗粒的结果显示是准确的。对应于三维的情况下(巴克斯特的模型)的结果是通过使用不同的处方的相互作用势的额外粒子的耦合参数的依赖性内的撞击-Yevick近似。在$μ$路线中得到了气液相变的临界点和共存曲线,并与其他热力学路线和计算机模拟的预测进行了比较。结果表明,$μ$路线比维里,能量,压缩性和零分离路线产生更好的描述。

英文摘要:

The coupling-parameter method, whereby an extra particle is progressively coupled to the rest of the particles, is applied to the sticky-hard-sphere fluid to obtain its equation of state in the so-called chemical-potential route ($μ$ route). As a consistency test, the results for one-dimensional sticky particles are shown to be exact. Results corresponding to the three-dimensional case (Baxter's model) are derived within the Percus-Yevick approximation by using different prescriptions for the dependence of the interaction potential of the extra particle on the coupling parameter. The critical point and the coexistence curve of the gas-liquid phase transition are obtained in the $μ$ route and compared with predictions from other thermodynamics routes and from computer simulations. The results show that the $μ$ route yields a general better description than the virial, energy, compressibility, and zero-separation routes.

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