Lecture_30_notes - Chemical Engineering 374 Fluid Mechanics...

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1 1 Chemical Engineering 374 Fluid Mechanics Fall 2011 Pumps Overview Pumps/Turbines – Chp 14.1-14.2 (today), 14.2-14.3 (Wed.) 14.4-14-5 (Friday) Pumps – Add energy to fluid (increase pressure, not speed) Liquids à pumps Gases – Fans: Low Δ P, High Flow, < ~ 1 psi – Blowers: Med Δ P, Med Flow, < ~ 40 psi – Compressors: High Δ P, Low Flow, >~ 40 psi Pumps – Positive displacement – Dynamic 2
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Positive Displacement Pumps Displace fluid by moving parts with low clearance Piston/cylinder Turning gears Screws Lower flow rates < 1000 gpm Self priming High pressures (> 500 psi) Need safety devices High viscosity fluids Oil, foods Pulsating flow, hard to control flow rate 3 Centrifugal Pumps Centripetal forces accelerate fluid and increase pressure. Flow enters axially and is accelerated to the outside where pressure rises. High flow rates (> 300,000 gpm) Large gaps Lower pressures (relative) ~100 psi Not self priming
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This note was uploaded on 03/11/2012 for the course CHE 374 taught by Professor Davidlignell during the Fall '12 term at Brigham Young University, Hawaii.

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Lecture_30_notes - Chemical Engineering 374 Fluid Mechanics...

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