Prediction of thermal conductivity, viscosity and diffusion coefficients of isotopes of xenon, tellurium hexafluoride and uranium hexafluoride dilute gases using a microscopic perspective

Abstract

In the enrichment industry, it is very important to study the transport coefficients such as thermal conductivity, viscosity and diffusion coefficients of isotope gases such as xenon, tellurium hexafluoride and uranium hexafluoride. In general, there are two perspectives for studying the behavior of gas: the macroscopic and the microscopic perspective. The macroscopic model considers the behavior of a gas as continuous and the microscopic model, considers the gas as separate particles and for each particle, a position and velocity at a specific time. In this paper, the thermal conductivity, viscosity and diffusion coefficients of single-component, binary mixture, multicomponent and isotopic gases are investigated using the microscopic properties of gases. Then the values of these coefficients are determined for all isotopes of xenon, tellurium hexafluoride and uranium hexafluoride. The COT POD software has also been prepared by these relationships extracted for transport coefficients. Due to the lack of experimental results for isotopic validation, the results of microscopic relationships obtained from the software are compared with the experimental results of a mixture of different gases including helium and neon and then neon, argon and krypton multi-component systems. Results have a good agreement with each other.

Keywords

• thermal conductivity coefficient
• viscosity coefficient
• diffusion coefficient
• isotopic gases
• multicomponent gases