Chapter 2: Fluid Properties Solid-Liquid-Gas Specific Weight Compressible vs. Non-Compressible Solid under shear vs Liquid under Shear Viscosity Newtonian vs. Non-Newtonian Surface Tension Vapor Pressure
Some properties of fluids • Solid – Fluid Solid – liquid – gas • How to best distinguish between them? • Solid properties, and response to container boundaries • Mass, density, weight, and the “specifics”
Solid-Liquid and Gas A given mass of liquid will maintain its volume but change its shape to match that of the container where they are in contact.
Some more fluid properties • Solid – Fluid: how does each respond to an applied shear stress? • (How about a applied pressure stress?) • Viscosity and rheology • What sort of forces does a fluid exert? • Surface tension • Vapor pressure
Imagine an elastic solid held between two Plates-and then applying a shear force To the top plate Then imagine a long open tank (flume) holding water with a wood block floating on the surface And then apply a shear force to the wood Top layer of fluid moves with velocity of block Bottom layer does not move—The NO SLIP condition
Contrast to solid Strain-deformation u displacement shear modulus
Note dependence on R Recall rg is g specific weight
In Denver the atmospheric pressure is only 95% (see page 40) On Everest only 75%--the boiling points are reduced accordingly Boiling will occur