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Analysis of viscosity behaviour of shear-thinning hydrogels in 3d-printing nozzles

• Fatemeh Ardaneh
• Eero Immonen
• Ashvinkumar Chaudhari
• Jani Pelkonen
• Santeri Knuutinen

(2024). ECMS 2024, 38th Proceedings
Edited by: Daniel Grzonka, Natalia Rylko, Grazyna Suchacka, Vladimir Mityushev, European Council for Modelling and Simulation.
DOI: http://doi.org/10.7148/2024
ISSN: 2522-2422 (ONLINE)
ISSN: 2522-2414 (PRINT)
ISSN: 2522-2430 (CD-ROM)
ISBN: 978-3-937436-84-5
ISBN: 978-3-937436-83-8 (CD) Communications of the ECMS Volume 38, Issue 1, June 2024, Cracow, Poland June 4th – June 7th, 2024

https://doi.org/10.7148/2024-0359

Fatemeh ardaneh, Eero immonen, Ashvinkumar chaudhari, Jani pelkonen, Santeri knuutinen (2024). Analysis of Viscosity Behaviour of Shear-Thinning Hydrogels in 3D-Printing Nozzles, ECMS 2024, Proceedings Edited by: Daniel Grzonka, Natalia Rylko, Grazyna Suchacka, Vladimir Mityushev, European Council for Modelling and Simulation. doi:10.7148/2024-0359

Hydrogels with shear-thinning properties are being investigated for use in biomedical applications such as drug delivery, tissue engineering, and 3D bioprinting. For 3D bioprinting, it is very important not to change materials such as the survival of cells during the printing process. This study aims to determine the best model for predicting viscosity using Computational Fluid Dynamics (CFD) simulations and further investigate the relationship between material properties and nozzle geometrical parameters to optimize 3D printing processes. Three types of Alginate gels with different shear-thinning behaviour are considered and their viscosity is modeled by: Power Law, Herschel–Bulkley, and Bird-Carreau models. The most accurate model is used in the further CFD simulations of these materials through two different types of 3D printing nozzles: 18G and 22G. The results showed how shear stress is influenced by the viscosity properties. Moreover, the effect of shear-thinning properties on the printability of materials is discussed.