1/14/2024 0 Comments Kinematic viscosity meaning![]() Kinematic viscosity unit in CGS system.SI unit of kinematic viscosity is m²/sec. ![]() ![]() Kinematic viscosity (ν) is = dynamic viscosity/mass density = μ/ρ.Kinematic viscosity is denoted by the symbol “ν”.Note: Water is nearly 55 times viscous than air. SI unit of dynamic viscosity is Pa-sec, or N-sec/m² or kg/m-secġ poise = Dyne-sec/cm².Dynamic viscosity is denoted by the symbol “µ”.Water, air, and gasoline are Newtonian under normal conditions. Μ = absolute viscosity, “or” coefficient of viscosity “or” dynamic viscosity Τ = shear stress opposing the movement of fluid The fluid for which the rate of deformation is linearly proportional to shear stress. The fluid that obeys newton’s law of viscosity is known as a Newtonian fluid. The rate of change of angular deformation is equal to the velocity gradient across the flow.īased on the relationship between the applied shear stresses and the rate of flow or deformation, fluids can be classified as Newtonian and non-Newtonian fluids. Rate of change od shear strain (dθ/dt) = Velocity gradient (du/dy) In time dt, the top layer will move with respect to the bottom layer by a distance ds= du.dt Similarly, as a reaction to this, the lower layer tries to retard the upper one. The upper layer which is moving faster tries to draw the lower slowly moving layer along with it. Suppose one layer of fluid is moving with respect to the other layer by a velocity du and the vertical gap between the two layers be dy. It is a measure of the resistance of the fluid to deformation It is duo lo cohesion and molecular momentum exchange between fluid layers and as flow occurs, these effects appear as shoring stressors between the moving layers ![]() This is mainly due to cohesion and molecular motion exchange between fluid layers, and as flow occurs, these effects manifest as shear stresses between the moving layers. Viscosity in fluid mechanics is a property of the fluids by virtue of which they offer resistance to shear or angular deformation. ![]()
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