Related Experiment Video
Updated: Dec 25, 2025
08:42
Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
Published on: April 10, 2017
20.5K
Additive rheology of complex granular flows.
Thanh Trung Vo1,2, Saeid Nezamabadi2,3, Patrick Mutabaruka2
1Bridge and Road Department, Danang Architecture University, Da Nang, Vietnam.
Nature Communications
|March 21, 2020
Summary
Researchers developed a unified framework to model complex granular flows, simplifying predictions of friction and packing. This advance aids understanding of natural and industrial granular dynamics.
Area of Science:
- Physics
- Engineering
- Materials Science
Background:
- Granular flows are common in nature and industry.
- Rheological properties like friction and packing are complex due to multiple interacting forces.
Purpose of the Study:
- To develop a unified framework for modeling complex granular flows.
- To simplify the understanding of rheological properties under various conditions.
Main Methods:
- Extensive particle dynamics simulations were performed.
- A model granular system of rigid particles was used.
- Apparent friction and packing fraction were normalized by cohesion-dependent quasistatic values.
Main Results:
- A single dimensionless number governs normalized friction and packing.
- This number, a generalized inertial number, accounts for all interactions.
- The parameter also describes texture variables like bond network connectivity and anisotropy.
Conclusions:
- The unified framework simplifies and extends granular dynamics modeling.
- This approach has potential applications in powder technology and natural flows.
- Stress additivity is key to accounting for diverse interactions.
Related Concept Videos
01:27Types of Fluids
812
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
812
01:18Newtonian Fluid: Problem Solving
773
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
773
01:19Viscosity of Fluid
1.0K
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
1.0K
01:22Generalized Hooke's Law
2.5K
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
2.5K
01:17Viscosity
7.0K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
7.0K
01:19Specific Gravity of Aggregate
679
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
679