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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

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Diffuse-Interface Blended Method for Imposing Physical Boundaries in Two-Fluid Flows.

Tanyakarn Treeratanaphitak¹, Nasser Mohieddin Abukhdeir^2,3

¹School of Integrated Science and Innovation, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani 12121, Thailand.

|May 8, 2023

Summary

A novel diffuse-interface method simplifies multiphase flow simulations by using structured meshes, reducing computational time and improving accuracy for chemical engineering applications.

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Area of Science:

Multiphase flow dynamics
Computational fluid dynamics
Chemical engineering simulations

Background:

Multiphase flows are crucial in chemical engineering, often simulated using complex conformal unstructured meshes.
These meshes are computationally expensive, time-consuming to generate, and can introduce numerical instability.
Existing methods struggle with accuracy and efficiency in complex physical systems.

Purpose of the Study:

To develop a novel diffuse-interface method for incompressible two-fluid multiphase flow.
To enable the use of simple structured meshes for simulating physical boundaries.
To improve the efficiency and accuracy of multiphase flow simulations in chemical engineering.

Main Methods:

A diffuse-interface approach was developed for the incompressible two-fluid multiphase flow model.
Boundary conditions were imposed by blending conservation equations of the two-fluid model with a nondeformable solid.
The diffuse-interface method was compared against a conformal unstructured mesh for various interface functions and widths.

Main Results:

For small interface widths, the diffuse-interface method showed high accuracy (within 3%) compared to conformal meshes.
As interface width increased, deviations up to 30% were observed in gas fraction and hold-up.
Simulations of flow past a cylinder showed the diffuse interface altering the effective boundary thickness over time.

Conclusions:

The diffuse-interface method offers a viable alternative to conformal meshes for multiphase flow simulations.
Mesh simplicity and reduced generation time are key advantages, especially for dispersed flows.
Careful selection of interface width is necessary to maintain accuracy in complex flow scenarios.