When creating a fluid mixture consisting of propylene glycol and water in Flownex, which mixing methods are recommended for calculating the thermal conductivity and viscosity of the mixture? The goal is to select the most appropriate property mixing models to obtain accurate results for engineering analyses involving glycol-water solutions.
For thermal conductivity, the Filippov method is generally the recommended option when mixing propylene glycol and water. The Power Law method is not recommended for mixtures containing water, as noted in the Flownex documentation. Therefore, when water is one of the constituent fluids, the Filippov method is typically the preferred approach for conductivity calculations.
For viscosity, there is no single recommended method that applies universally to all propylene glycol-water mixtures. The most appropriate viscosity mixing model can depend on factors such as fluid composition, concentration range, and operating conditions. It is therefore recommended to review available experimental data or published correlations for the specific glycol-water mixture being modelled and select the method that best represents the expected behavior.