Viscosity in Simple Fluids: A Different Perspective Based on the Thermodynamic Dimension

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2024-07-08 DOI:10.1016/j.fluid.2024.114178

Ali Ghandili

引用次数: 0

Abstract

This work presents a different perspective on viscosity and a new interpretation of it by treating the fluid as a fractal lattice incorporating temporary molecular clusters (t-clusters) and using the thermodynamic dimension (D_T) idea. The D_T connects fluid viscosity to its EoS by computing the effective intermolecular potential, U(r, T), which may be found via thermodynamic relations from the fluid equation of state (EoS). Finally, a general viscosity equation is developed utilizing standard and well-established statistical thermodynamic relations. The approach is applied to nitrogen fluid as a case study because of the fluid's extensiveness data in the literature. Less than 2% is the absolute average deviation percent (AAD%) for viscosity prediction in the range of 65 K to 1000 K for pressures less than 2000 MPa. It is simple to code the viscosity equation that is obtained.

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简单流体的粘度：基于热力学维度的不同视角

本研究将流体视为包含临时分子簇（t-clusters）的分形晶格，并利用热力学维度（DT）思想，从另一个角度对粘度进行了新的解释。DT 通过计算有效分子间势能 U(r,T)，将流体粘度与其状态方程（EoS）联系起来。最后，利用标准和成熟的统计热力学关系建立了一般粘度方程。该方法以氮气流体为例进行研究，因为该流体在文献中具有一定的延展性数据。在 65 K 到 1000 K 的范围内，压力小于 2000 MPa 时，粘度预测的绝对平均偏差率 (AAD%) 小于 2%。对得到的粘度方程进行编码非常简单。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.