Correct option is D
Ideal fluid:
A fluid that is incompressible and is having no viscosity is known as an ideal fluid.
Ideal fluid is an imaginary fluid as all the fluids, which exist, have some viscosity.
Real fluid:
A fluid that possesses viscosity, is known as real fluid.
All the fluid in practice is real fluids.
Newtonian fluid:
Fluids for which shear stress (τ) is directly proportional to the deformation rate or velocity gradient are Newtonian fluid.
Non-Newtonian fluid:
Fluids for which shear stress (τ) is not directly proportional to the deformation rate or velocity gradient are non-Newtonian fluid.
Pseudoplatsic (n < 1):
Fine particle suspension, gelatine, blood, milk, paper pulp, polymeric solutions such as rubbers, paints.
Dilatant fluids (n > 1):
Ultrafine irregular particle suspension, sugar in water, aqueous suspension of rice starch, quicksand, butter printing ink.
Ideal plastics or Bingham plastic fluids:
Sewage sludge, drilling muds, toothpaste.
Thixotropic and rheopectic fluid:
Thixotropic fluids are liquids or gases whose viscosity decreases upon applying stress over a known time period.
Therefore, it can be defined as a time-dependent pseudoplastic behaviour.
In contrast, the behaviour of rheopectic fluids can be described as time-dependent dilatant behaviour
Printer’s ink, crude oil, lipstick, certain paints and enamels
Very rare liquid-solid suspensions, gypsum suspension in water and bentonite solutions.
Viscoelastic fluids:
Liquids solid combination in pipe flow, bitumen, tar, asphalt, polymerized fluids with drag reduction features.
