Creating Mixed Fluids in Flownex

What type of fluid mixtures can be created in Flownex?

This article provides more information related to the different types of fluid mixtures that can be created in Flownex® and provides the user with the necessary steps to create such a mixed fluid.

HOW TO CREATE FLUID MIXTURES IN FLOWNEX

Flownex® allows users to create custom fluid mixtures. These mixtures include:

  • Gas Mixtures
  • Liquid Mixtures
  • Two-Phase Fluid and Gas Mixtures
  • Particles and Liquid Mixtures (Slurries)
  • Gas and Liquid Mixtures

For the mixtures listed above, it is important to note that Flownex® also allows mixtures of mixtures, for example, a mixture of liquids and a mixture of gasses can be used to create a new gas and liquid mixture.

A fluid mixture can be created by following the steps below.

STEP 1: OPEN THE "CHARTS AND LOOKUP TABLES" LIBRARY

The user can open the Charts and Lookup Tables library by clicking on the “Charts and Lookup Tables” tab.

Figure 1: Charts and Lookup Tables Library.

STEP 2: OPEN "MATERIALS AND FLUIDS" IN THE FLOW SOLVER TREE

The user can expand the “Flow Solver” tree and then the “Materials and Fluids” tree in the Project Database, as shown in Figure 2.

Figure 2: Materials and Fluids Library in Project Database.

STEP 3: ADD A NEW CATEGORY

The user can right-click on “Mixed Fluids” and select “Add Category”. The user can then also rename the newly created category.

Figure 3: Creating a New Category.

STEP 4: ADD A NEW MIXED FLUID

The user can create the new mixed fluid by right-clicking on the newly added category and selecting “Add new Mixed Fluid”. The newly created fluid can then be renamed.

Figure 4: Adding a New Mixed Fluid.

STEP 5: EDIT THE MIXED FLUID

The user can right-click on the newly created mixed fluid and edit the fluid to modify the mixture.

Figure 5: Edit the New Mixed Fluid.

STEP 6: DEFINE THE FLUID MIXTURE

The user can define the fluid mixture by selecting the type of mixture, for example “Gas Mixture” and then selecting the necessary fluids that should form part of the mixture.

Figure 6: Creating New Mixed Fluid.

The user can then select the mixing methods, which determine how the Conductivity and Viscosity of the mixture will be calculated. The different Mixing Methods are described in detail in the Flownex® General User Manual. Lastly, the background fluid must be specified, which will be used as the main fluid in the mixture. The user can then click on the OK button. 

STEP 7: ASSIGNING THE FLUID TO THE NETWORK

Once the mixture has been configured, the mixed fluid can be assigned to the network.

Figure 7: Assigning a Mixed Fluid to a Network.

STEP 8: SPECIFYING MASS FRACTIONS

It is important to specify the mass fractions of the mixture on the appropriate Boundary Condition. The sum of the mass fractions should be equal to a value of 1. If the sum of mass fractions is less than one, the background fluid will be used to fill the remaining fraction. If the mass fractions for the mixture are not specified, the fluid selected as the background fluid will be used entirely.

Figure 8: Specifying Mass Fractions of the Mixed Fluid on a Boundary Condition.
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