ABSTRACT Microfluidic dual Y‐junction channels play a vital role in biomedical, chemical, and industrial applications. Yet studies on non‐Newtonian fluid behavior in such complex geometries remain limited. The current study presents a computational fluid dynamics (CFD)‐based analysis of Newtonian, shear‐thinning ( n = 0.00035), and shear‐thickening ( n = 1.23) fluids through a dual Y‐junction channel, using COMSOL Multiphysics 6.0. A five‐rectangle dual Y‐channel was modeled to study velocity and pressure distributions using different types of fluid, as mentioned above. Results show Newtonian fluids exhibit linear pressure drops and smooth velocity profiles, whereas shear‐thinning fluids display symmetric velocity peaks and nonlinear pressure variations. On the other hand, shear‐thickening fluids demonstrate multimodal velocity with complex pressure recovery patterns. These insights aid in optimizing microfluidic designs for applications such as polymer processing, lab‐on‐chip systems, and biological fluid transport.
Pal et al. (Thu,) studied this question.