Transport2

Transport2 - Transport Phenomena Lecture 2 "Fluid...

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1 Transport Phenomena Lecture 2 “Fluid Mechanics” GENE 111 Dr. Clague Fluids Fluids: – Liquids: • Milk • Blood •U r ine – and Gases •A i r •H 2 •CO 2 Fluids • Newtonian – Linear response to Shear • Non-Newtonian – Non-linear response to Shear “A fluid is a substance that can flow” U τ xy =− μ v x y xy v x y n
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2 Fluids and Fluid Properties F/L γ Surface Tension L/t v Fluid velocity F/A τ Shear Stress M/V ρ density P*s μ viscosity Units symbol property Comparison between Newtonian and Non-Newtonian fluids Newtonian Fluid Bingham Plastic Pseudoplastic Fluid , or shear- thinning fluids have a lower apparent viscosity at higher shear rates (blood, ketchup) Dilatant Fluid , or shear- thickening fluids have a higher apparent viscosity at higher shear-rates (cornstarch & water) Bingham plastic is a viscoplastic material that behaves as a rigid body at low stresses but flows as a viscous fluid at high stress. (off- shore slurries)
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3 Fluid Statics Fluid Statics • Stationary fluids, v = 0 ρ P 0 (Atmospheric) h P = P 0 + gh P @ y = 0 ?
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Transport2 - Transport Phenomena Lecture 2 "Fluid...

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