What are different types of rheological fluids?
In rheological measurements, three types of flow are often applied: the steady-state shear, dynamic shear, and external flow.
What are rheological properties of fluids?
Rheological properties refer to the Bingham plastic fluid parameters such as yield point (YP) and plastic viscosity (PV). It is one of the several flow characteristics of drilling fluid, workover fluid or completion fluid or cement.
What are ER and MR fluids discuss their properties and areas of application?
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.
WHAT IS MR fluid used for?
Magneto rheological (MR) fluid technology has been proven for many industrial applications like shock absorbers, actuators, etc. MR fluid is a smart material whose rheological characteristics change rapidly and can be controlled easily in presence of an applied magnetic field.
What are Mr and ER fluids?
Magnetorheological (MR) and electrorheological (ER) fluids belong to a family of controllable fluids, in which the flow can be controlled through the application of an electric or magnetic field. Also a new way of using MR fluids, in which the fluid is contained in an absorbent matrix has been developed.
Why is rheology important in pharmacy?
Rheology is therefore crucially important as it will directly affect the way a drug is formulated and developed, the quality of the raw and finished product, the drug efficacy, the way a patient adheres to the prescribed drug, and the overall healthcare cost.
How are electro-rheological fluids used in engineering?
The use of electro-rheological (ER) fluids is relatively new in engineering applications. ER fluids can change from liquid to solid-like gel under an electrical field, and this change takes place within milliseconds. The change is reversible once the electrical field is removed.
What is the definition of a magnetorheological fluid?
1Rheos is a Greek word to Flow. Rheology is the science if material flow under external load conditions. The word Magnetorheological Fluid means fluid whose apparent viscosity increases, with application of MAGNETIC field. Also known as MR fluids, these fluids have magnetisable particles suspended in the base fluid.
Who is the founder of the rheology theory?
Eugene Bingham, a colloid chemist, first coined the term “Rheology.” He also showed that for many real fluids a critical level of stress must be attained in order to initiate flow. Below this critical stress, τy, the material behaves as a solid, absorbing the stress energy without flowing.
What happens to the viscosity of a rheopectic fluid?
A rheopectic fluid such as a dense suspension of latex particals or plastisols will gel when agitated. If allowed to rest, a rheopectic fluid will return to its original lower viscosity. The viscosity-shear rate curve forms a hysteresis loop and the hysteresis can be repeated indefinitely.