Lubrication

Question 1

Summarise the differences between hydrodynamic and squeeze film lubrication in terms of when they occur

Answer 1

Hydrodynamic lubrication occurs when 2 surfaces slide over one another, forming a wedge of fluid. as the surfaces slide, a lifting pressure is generated as the motion drags the viscous lubricant into the narrowing gap between the two surfaces.
Squeeze form lubrication occurs when 2 surfaces are forced together. the viscous lubricant will not instantansouely be squeezed out from the gap between the two surfaces. SFL acts to cushion and protect the surfaces.

Question 2

In boosted lubrication which type of molecules are forced into the articular cartilage?

Answer 2

small molecules and water