Fluid Mechanics Flashcards
What is Pascal’s Law?
Pressure at a single point is the same in all directions
What is the hydrostatic law?
Pressure at rest only varies in the vertical direction, z direction
Shear stress and Pressure are both Force per unit Area, so what is the difference between them?
Pressure acts perpendicular to the surface, AKA is normal stress, while shear stress acts parallel to the surface, AKA is a tangential stress.
How is shear stress, tau, and viscosity related?
Tau=F/A=mew(du/dy)
What is Newton’s Law of Viscocity?
The shear stress between two layers of a fluid is directly proportional to the velocity gradient between those layers. A fluids viscosity is directly related to how quickly the layers slide past each other
What is the difference between kinematic viscosity, viscosity, absolute viscosity, and dynamic viscosity?
Kinematic viscosity is represented by nu, and is the viscosity AKA dynamic AKA absolute viscosity divided by density. It’s units are m^2/s, and there is no force involved.
What is hydrostatic force?
The force on plane Area when fluid is not moving, no tangential force, only normal to area.
