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Unformatted text preview: 9/9/2008 Fluid Mechanics 3502 Day 2 (Fall, 2008)
Fluid Properties Part 2
Solid-Liquid-Gas Solid under shear vs Liquid under Shear Specific Weight Compressible vs. Non-Compressible Viscosity Newtonian vs. Non-Newtonian Fluids Surface Tension Vapor Pressure Summary from last time Response to applied stress - pressure
A mass of liquid at a constant temperature will always occupy the same volume regardless of pressure (though if you change the temperature, you will likely change the density) A mass of gas at a constant temperature will occupy different volumes depending on the applied pressure, i.e., the density depends on pressure and temperature Ideal Gas Law
The ideal gas law relates the absolute pressure (p) to the density (ρ) and absolute temperature (T) in a gas: p = ρR T R is the gas constant (table in book) Example 1 9/9/2008 What about applied shear stress? Response to applied stress - shear Top layer of fluid moves with velocity of block Bottom layer does not move—The NO SLIP condition Example
A board 1 m x 1m that weighs 20 N slides down an inclined ramp. The slope θ = 30o, and the velocity of the board = 2.0 cm/s. The board is separated from the ramp by a thin film of oil whose dynamic viscosity is 0.05 N s / m2 What is the thickness of the film? For very thin layers, we sometimes assume a linear velocity profile: dV/dy ~ ∆V/∆y Contrast to solid Strain-deformation u displacement
τ=G du dy shear modulus 2 ...
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This note was uploaded on 06/09/2010 for the course CIVIL 3502 taught by Professor Kimberlyhill during the Fall '08 term at University of Minnesota Crookston.
- Fall '08