Abstract
Droplet impact on porous media has a broad range of applications such as material processing, drug delivery and ink injection etc. The simulation studies of such processes are rather limited. To represent the spreading and absorption process of the droplet on porous materials, robust numerical schemes capable of accurately representing wettability as well as capillary effects need to be established. The current work, presents one of the first studies of droplet impact on a real porous media geometry model extracted from a micro-CT scan. The process involves processing of CT image and subsequent threshold based on the structures segmentation. The porous geometry is extracted in the form of a STL (STereoLithography) model, which, with the aid of dedicated software like ANSA and SnappyHexMesh, is converted to an unstructured mesh for successful discretization of the flow domain. The solution algorithm is developed within the open source CFD toolbox OpenFOAM. The numerical framework to track the droplet interface during the impact and the absorption phases is based on previous work. The volume-of-fluid (VOF) method is used to capture the location of the interface, combined with additional sharpening and smoothing algorithms to minimise spurious velocities developed at the capillary dominated part of the phenomenon (droplet recession and penetration). A systematic variation of the main factors that affect this process are considered, i.e. wettability, porous size, impact velocity. To investigate the influence of porous structures on droplet spreading, the average porosity of the media is varied between 18.5% and 23.3% . From these numerical experiments, we can conclude that the droplet imbibition mainly depends on the porous wettability and secondly that the recoiling phase can be observed in the hydrophobic case but not in the hydrophilic case.
Original language | English |
---|---|
Title of host publication | Proceedings 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017 |
Place of Publication | Valencia, Spain |
Publisher | ILASS |
Pages | 1-8 |
Number of pages | 8 |
ISBN (Print) | 9788490485804 |
DOIs | |
Publication status | Published - 10 Sept 2017 |
Event | 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017 - Valencia, Spain Duration: 6 Sept 2017 → 8 Sept 2017 |
Conference
Conference | 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017 |
---|---|
Country/Territory | Spain |
City | Valencia |
Period | 6/09/17 → 8/09/17 |
Bibliographical note
This work is licensed under a Creative Commons 4.0 International License (CC BY-NC-ND 4.0).Fingerprint
Dive into the research topics of 'Simulation of droplet spreading on micro-CT reconstructed 3D real porous media using the volume-of-fluid method'. Together they form a unique fingerprint.Profiles
-
Anastasios Georgoulas
- School of Arch, Tech and Eng - Principal Lecturer
- Centre for Regenerative Medicine and Devices
- Advanced Engineering Centre
Person: Academic