Friday 21 March 2025
Researchers have made a significant breakthrough in understanding the behavior of suspensions, which are mixtures of particles and liquids. The study reveals that the non-Newtonian properties of these mixtures can be unified by a single dimensionless number, known as the L number.
Suspensions are all around us, from the way paint flows to the texture of yogurt. They are complex systems that exhibit unique behavior when subjected to stress or strain. In particular, suspensions often show non-Newtonian properties, meaning their viscosity (thickness) changes in response to changes in shear rate (rate of flow).
For decades, researchers have been trying to understand and predict the behavior of suspensions. However, this has proven challenging due to the complex interactions between particles and the liquid they are suspended in. The problem is further complicated by the fact that different types of particles exhibit different behaviors.
Recently, a team of scientists has made progress in understanding the behavior of suspensions by identifying a key dimensionless number, known as the L number. This number is a ratio of the stress applied to the suspension to the stress associated with the inter-particle interactions.
The researchers found that by using the L number, they could unify the non-Newtonian properties of different types of suspensions. They were able to predict how the viscosity of a suspension would change in response to changes in shear rate, simply by knowing the value of the L number.
One of the key insights from this study is that the behavior of suspensions is not solely determined by the size and shape of the particles, but also by the strength of the inter-particle interactions. The researchers found that as the L number increases, the suspension becomes more non-Newtonian, exhibiting a greater change in viscosity in response to changes in shear rate.
The implications of this study are far-reaching. For example, it could be used to improve our understanding of how suspensions behave in different industrial processes, such as paint production or food processing. It could also lead to the development of new materials with unique properties.
Overall, this study represents a significant advance in our understanding of the behavior of suspensions. By identifying the L number as a key factor in determining their non-Newtonian properties, researchers can now better predict and control the behavior of these complex systems.
Cite this article: “Unlocking the Secrets of Suspensions: A Breakthrough in Understanding Non-Newtonian Behavior”, The Science Archive, 2025.
Suspensions, Non-Newtonian Fluids, Viscosity, Shear Rate, Inter-Particle Interactions, L Number, Particle Size, Particle Shape, Rheology, Fluid Dynamics.
