What are ER and MR fluids?

Electrorheological (ER) and magnetorheological (MR) fluids, which can be transformed from the liquid state into the solid state in milliseconds by applying an electric or a magnetic field, are smart fluids having the potential to revolutionize several industrial sectors.

A magnetorheological fluid (MR fluid, or MRF) is a type of smart fluid in a carrier fluid, usually a type of oil. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity, to the point of becoming a viscoelastic solid. MR fluid is different from a ferrofluid which has smaller particles.

Also Know, what is fluid rheology? l?d?i/; from Greek ?έω rhéō, “flow” and -λoγία, -logia, “study of”) is the study of the flow of matter, primarily in a liquid state, but also as “soft solids” or solids under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force.

Beside above, how do you make electro liquid fluid?

A simple ER fluid can be made by mixing cornflour in a light vegetable oil or (better) silicone oil. There are two main theories to explain the effect: the interfacial tension or ‘water bridge’ theory, and the electrostatic theory.

What is electro Rheostatic?

Electrorheostatic and Magnetorheostatic. Electrorheostatic (ER) and magnetorheostatic (MR) materials are fluids, which can experience a dramatic change in their viscosity. ER fluids have mainly been developed for use in clutches and valves, as well as engine mounts designed to reduce noise and vibration in vehicles

How do dampers work?

Dampers: Shock Absorbers. Shock absorbers slow down and reduce the magnitude of vibratory motions by turning the kinetic energy of suspension movement into heat energy that can be dissipated through hydraulic fluid.

How much is magnetic suspension?

The $2,500 price tag for active suspension that’s on $50,000 cars suggests the cost of a Bose suspension would be on the high side of $5,000 and might be a $10,000-plus cost-adder. Also, several automakers use electric motors to reduce or eliminate body roll in turns.

What is MRF polishing?

Magnetorheological Finishing (MRF) Magnetorheological Finishing (MRF) is a deterministic lens surface finishing process which G&H uses to improve form finish of precision optical components. This technique enables us to control optical polishing with a greater degree of precision than conventional lap polishing.

What do you mean by viscosity?

If I fill the same cup with water, for example, the cup will drain much more quickly. Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

Where does ferrofluid come from?

Ferrofluid is made of tiny, nanometer-sized particles of coated magnetite suspended in liquid. When there’s no magnet around, ferrofluid acts like a liquid. The magnetite particles move freely in the fluid. But when there’s a magnet nearby, the particles are temporarily magnetized.

What are magnetic dampers?

A magnetorheological damper or magnetorheological shock absorber is a damper filled with magnetorheological fluid, which is controlled by a magnetic field, usually using an electromagnet.

How are fluids classified?

In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress, or external force. Fluids are a phase of matter and include liquids, gases and plasmas. Liquids form a free surface (that is, a surface not created by the container) while gases do not.

What are the different types of fluids?

Fluids can be classified into four basic types. They are: Ideal Fluid. Real Fluid. Ideal fluid. Real fluid. Newtonian fluid. Non-Newtonian fluid, and. Ideal plastic fluid.

What is rheology used for?

Basics of rheology. Rheology is used to describe and assess the deformation and flow behavior of materials. Fluids flow at different speeds and solids can be deformed to a certain extent.

How is rheology measured?

To measure the rheological properties of a material, rheometers are used. They measure the torque and the deflection angle of the measuring bob. This means that in a viscosity measurement the rheometer presets a certain current that correlates to a defined torque.

Why do we study rheology?

Rheology is the study of flow and deformation in general. We study it because it shows us how materials and suspension flow. Other applications of rheology are studying cure of materials such as resins and degradation processes, since the change the way it behaves regarding its elastic and viscous modulus.

What are different types of rheological fluids?

Figure 1, non-Newtonian fluids are classified into three types: shear-thinning, viscoplastic, and shear- thickening. Characteristics of shear-thinning fluid viscosity are indicated by a decrease due to higher shear-rate.

Is water a Newtonian fluid?

Some examples of Newtonian fluids include water, organic solvents, and honey. For those fluids viscosity is only dependent on temperature. These are strictly non-Newtonian, but once the flow starts they behave essentially as Newtonian fluids (i.e. shear stress is linear with shear rate).