Lecture_36_notes - 1 1 Chemical Engineering 374 Fluid...

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Unformatted text preview: 1 1 Chemical Engineering 374 Fluid Mechanics Fall 2011 NonNewtonian Fluids Outline Types and properties of non-Newtonian Fluids Pipe flows for non-Newtonian fluids Velocity profile / flow rate Pressure drop Friction factor Pump power Rheological Parameters 2 Power Law Fluids 2 Non-Newtonian Fluids 3 dv/dy dv/dy dv/dy dv/dy dv/dy dv/dy dv/dy dv/dy Newtonian Bingham Plastic Pseudoplastic Dilitant = * dv/dy = * dv/dy + y = * | dv/dy| n Bingham Plastic 3D elastic structures. Weak solid structures that must be broken Resists small shear, but structure breaks apart with large shear. Then is ~ linear with du/dx Some slurries (coal, grain slurries), sewage sludge. Toothpaste (no drip) Larger particles weak solid structure breaks 4 dv/dy dv/dy Bingham Plastic = * dv/dy + y 3 Pseudoplastic Most common Dissolved or dispersed particles, like dissolved long chain molecules. Have a random orientation in the fluid at rest, but line up when the fluid is sheared. decreases with strain rate drops as molecules align Polymer melts, paper pulp suspensions, pigment suspensions, hair gel, blood, muds, most slurries Shear-Thinning motor oil 5 dv/dy dv/dy Pseudoplastic = K * (- dv/dy) n Dilitant Rare Slurries of solid particles with barely enough liquid to keep apart. (corn starch, water squeezed out at high shear) At low strain rates, the fluid can lubricate solids; at high strain rates, this lubrication breaks down....
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Lecture_36_notes - 1 1 Chemical Engineering 374 Fluid...

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