Non-Newtonian Flow

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Non-Newtonian Fluid

The non-Newtonian fluid is a fluid whose viscosity changes with strain rate. As a result, such fluids lack a certain viscosity. Such as liquid soaps and cosmetics, foods like butter, cheese, jam, ketchup, mayonnaise, soup and yogurt, natural ingredients like magma, lava, gum and extracts such as vanilla extract, biological fluids such as blood, saliva and synovial fluid (articular fluid), emulsions such as mayonnaise and some types of dissection.

In Newtonian fluids, the relationship between the shear stress variations and the applied stress rates is linear, and the constant-coefficient that converts this linear proportion to the equation is viscosity; but in non-Newtonian fluids, there is no linear relationship between the shear stress variations and the applied stress rates, and in this fluid range, the duration of the stresses plays an important role in the resulting shear stresses. Consequently, in non-Newtonian fluids, a constant coefficient such as viscosity does not make sense to describe the state of shear stress.

Non-Newtonian fluids are divided into three categories of time-independent, time-dependent, and viscoelastic.

In general, non-Newtonian fluids are divided into two groups, depending on the force applied and independent of the force applied.

Time-Dependent Non-Newtonian Fluids:

  1. a) Reopectic
  2. b) Thixotropic

Fluids whose viscosity changes over time as shear forces and shear stresses change.

Non-Newtonian Fluids Independent of Force Apply:

  1. a) Dilatant Fluids
  2. b) Quasi-Plastics
  3. c) Bingham

Their viscosity is independent of the time of shear stress and depends only on the shear force and shear stress.


High rheology material

Here, we investigate high rheology material. Rheology is the science of deformation and flow of the matter. Viscosity and shear stress are also the most important quantities which help us to understand rheology.

A fluid which has a linear relationship between shear stress and velocity gradient is Newtonian fluid. On the other hand, when this relationship is not linear the flow is non-Newtonian.

Rheology deals with both Newtonian and non-Newtonian fluids. ANSYS Poly flow will help engineers to design efficient products and reduce costs in applications such as glass forming, concrete shaping, thermoforming, etc.

Mr Company has exceptional experience in organizing projects related to rheology. If you want to use rheological materials, simulate non-Newtonian fluids and plastic flows to overcome engineering and design challenges ; we assure you that our Experts will give you the best advice.

Use the CARREAU model to define viscosity in ANSYS Fluent Software

In general, Newtonian fluids have constant viscosity during force application, but non-Newtonian fluids have variable viscosity during force application, which has different types. Time-dependent non-Newtonian fluids have two categories: Reopectic, such as printer ink and cream, which increase their viscosity over time, and Thixotropic, such as honey, whose viscosity They decrease when the force is applied.

Time-independent non-Newtonian fluids are also divided into three groups: Dilatants such as starch and clay whose viscosity depends only on the amount of applied force, and Pseudoplastic, such as greases, paints, soaps, and ketchup, which are inversely correlated with the amount of force applied. There are also other groups called Bingham, such as toothpaste and silica nanocomposites, which have a stress threshold or a certain amount of force and tension to flow. Carreau model attempts to create a wide range of fluids by establishing a curve commensurate with both the Newtonian and non-Newtonian fluid functions of the type of subtractive stress (Pseudoplastic). The relationship between viscosity and strain rate is obtained as follows:





In the above relation, n represents the degree of deviation from Newtonian fluids, η0 and ηꝏ, respectively, representing high and low viscosity values, λ the time constant value, the function H (T) indicating the temperature dependence as Arrhenius law, Ƴ Symbol of strain rate and η symbol of viscosity. All of the above values are entered in the Carreau model section. 𝛂 also indicates the ratio of activation energy to thermodynamic constant and T𝛂 denotes the reference temperature.


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