CE154 - Lecture 6 Closed Conduit Hydraulics

CE154 - Lecture 6 Closed Conduit Hydraulics - Fall 2009...

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Unformatted text preview: Fall 2009 CE154 1 Closed Conduit Hydraulics CE154 - Hydraulic Design Lecture 6 Fall 2009 CE154 2 Hydraulics of Closed Conduit Flow • Synonyms- closed conduit flow- pipe flow- pressurized flow • Objectives – to introduce- basic concepts of closed conduit flow, - its hydraulics, and - design method Fall 2009 CE154 3 Concepts • Closed Conduit vs. Open Channel Closed Conduit Open Channel No free surface Free water surface Gravity or pump driven Gravity driven Cavitation & other sub- atmospheric-pressure problems Waves & other surface disturbances Reynolds Number Re Froude Number Fr Fall 2009 CE154 4 Concepts – Reynolds Number • Reynolds Number (ratio of inertia force to viscous force) V = velocity (ft/sec) D = pipe diameter (ft) ρ = density of fluid (lbm/ft 3 ) μ = dynamic viscosity of fluid (lbm/ftsec or lbfsec/ft 2 ) ν = kinematic viscosity (ft 2 /sec) ν μ ρ VD VD = = Re Fall 2009 CE154 5 Concepts – Froude Number • Froud Number (ratio of inertia force to gravitational force ) • V = velocity g = gravitational acceleration h = depth of water gh V Fr = Fall 2009 CE154 6 Concepts - Turbulence • Turbulent vs. laminar flow Fall 2009 CE154 7 Concepts – turbulent flow • Turbulent flow - Critical Re (laminar to turbulent) in the order of 1000 Fall 2009 CE154 8 Concepts – laminar flow • Turbulent and Laminar flows Fall 2009 CE154 9 Concepts – uniform & steady flow • Uniform flow – constant characteristics with respect to space • Steady flow – constant characteristics with respect to time. Often adopted when establishing pipe system design parameters (pressure & flow at certain locations). Consider unsteady (transient) phenomena to refine design (pipe pressure class and thickness) Fall 2009 CE154 10 Conservation of Mass 1 2 Control Volume Fall 2009 CE154 11 Conservation of Mass • Consider the control volume O I dt dS- = Fall 2009...
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This note was uploaded on 09/08/2010 for the course CE 251 at San Jose State.

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CE154 - Lecture 6 Closed Conduit Hydraulics - Fall 2009...

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