A liquid has a dynamic Visconsity
of 4.98 × 10^3 N-s/m^2 & Kinematics Viscosity
of 3.5 × 10^6 m^2/s. Determine specific gravity of liquid.
Answers
Answer:
Explanation:
The units of dynamic viscosity are: Force / area x time The Pascal unit (Pa) is used to describe pressure or stress = force per area This unit can be combined with time (sec) to define dynamic viscosity.
Absolute, Dynamic and Kinematic Viscosity
Dynamic, absolute and kinematic viscosities - convert between CentiStokes (cSt), centipoises (cP), Saybolt Universal Seconds (SSU) and degree Engler
Viscosity is an important fluid property when analyzing liquid behavior and fluid motion near solid boundaries. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. The shear resistance in a fluid is caused by inter-molecular friction exerted when layers of fluid attempt to slide by one another.
viscosity is the measure of a fluid's resistance to flow
molasses is highly viscous
water is medium viscous
gas is low viscous
There are two related measures of fluid viscosity
dynamic (or absolute)
kinematic
Dynamic (absolute) Viscosity
Absolute viscosity - coefficient of absolute viscosity - is a measure of internal resistance. Dynamic (absolute) viscosity is the tangential force per unit area required to move one horizontal plane with respect to an other plane - at an unit velocity - when maintaining an unit distance apart in the fluid.
The shearing stress between the layers of a non turbulent fluid moving in straight parallel lines can be defined for a Newtonian fluid as
Fluid - viscosity and velocity profile
Shear stress can be expressed
τ = μ dc / dy
= μ γ (1)
where
τ = shearing stress in fluid (N/m2)
μ = dynamic viscosity of fluid (N s/m2)
dc = unit velocity (m/s)
dy = unit distance between layers (m)
γ = dc / dy = shear rate (s-1)
Equation (1) is known as the Newtons Law of Friction.
(1) can be rearranged to express Dynamic viscosity as
μ = τ dy / dc
= τ / γ