• saurabhjain
    saurabhjain

    CLASSIFICATION OF FLUIDS

    Ideal fluid:

    A fluid, which is incompressible and having no viscosity, is known as an ideal fluid. Ideal fluid is only an imaginary fluid as all the fluids, which exist, have some viscosity.

    Real fluid:

    A fluid, which possesses viscosity, is known as real fluid. All the fluids, in actual practice, are real fluids.

    Example : Water, Air etc.

    Newtonian fluid:

    A real fluid, in which shear stress in directly proportional to the rate of shear strain or velocity gradient, is known as a Newtonian fluid.

    Example : Water, Benzine etc.

    Non Newtonian fluid:

    A real fluid, in which shear stress in not directly proportional to the rate of shear strain or velocity gradient, is known as a Non Newtonian fluid.

    Example : Plaster, Slurries, Pastes etc. 

    Ideal plastic fluid:

    A fluid, in which shear stress is more than the yield value and shear stress is proportional to the rate of shear strain or velocity gradient, is known as ideal plastic fluid.

    types of fluid.jpg

    Incompressible fluid:

    A fluid, in which the density of fluid does not change which change in external force or pressure, is known as incompressible fluid. All liquid are considered in this category.

    Compressible fluid:

    A fluid, in which the density of fluid changes while change in external force or pressure, is known as compressible fluid. All gases are considered in this category.

    Graphical representation of different fluids:

    vg.jpg

    Tabular representation of fluid types:

    Types of fluid
    Density
    Viscosity
    Ideal fluid
    Constant
    Zero
    Real fluid
    Variable
    Non zero
    Newtonian fluid
    Constant/ Variable
    T = u(du/dy)
    Non Newtonian fluid
    Constant/ Variable
    T ≠ u(du/dy)
    Incompressible fluid
    Constant
    Non zero/zero
    Compressible fluid
    Variable
    Non zero/zero

    CLASSIFICATION OF FLOWS ON THE BASIS OF MACH NUMBER.

    1. Incompressible flow-M less than 0.3
    2. Compressible subsonic flow-M between 0.3 and 1
    3. Transonic flow-M ranging between values less than 1 and more than 1
    4. Supersonic flow-M greater than 1 but less than 5
    5. Hypersonic flow - M greater than 5

     

    Edited by saurabhjain


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