# chapter 4 - UNIVERSITIKUALALUMPUR CHAPTER4 INTERNAL LIQUID...

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UNIVERSITI KUALA LUMPUR UNIVERSITI KUALA LUMPUR PowerPoint Presentation by Mohd Edyazuan Copyright © 2008 Mohd Edyazuan . All rights reserved CHAPTER 4 INTERNAL LIQUID FLOW IN PIPES AND CONDUITS

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Objectives Student should be able to: i. identify the characteristics of laminar flow and turbulent flow ii. employ Poiseulle and Darcy equation in basic problems iii. recall Bernoulli’s equation

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Flow Classification Laminar Flow - Flow structure is characterized by smooth motion in lamina or layer. There is no macroscopic mixing of adjacent fluid layer. - E.g. : A thin filament of dye injected into a laminar flow appears as a single line. There is no dispersion of dye throughout the flow, except the slow dispersion due to molecular motion.

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Flow Classification Laminar flow - Re < 2000 - 'low' velocity - Dye does not mix with water - Fluid particles move in straight lines - Simple mathematical analysis possible - Rare in practice in water systems.

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Flow Classification Turbulent Flow - Flow structure is characterized by random, three- dimensional motion of fluid particles superimposed on the mean motion. - E.g.: If a dye filament injected into a turbulent flow, it disperses quickly throughout the flow field; the line of dye breaks up into myriad entangled threads of dye.

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Flow Classification Turbulent flow - Re > 4000 - 'high' velocity - Dye mixes rapidly and completely - Particle paths completely irregular - Average motion is in the direction of the flow - Cannot be seen by the naked eye

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Copyright © 2008 Mohd Edyazuan. All rights reserved. Flow Classification - Changes/fluctuations are very difficult to detect. Must use laser. - Mathematical analysis very difficult - so experimental measures are used - Most common type of flow.

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## This note was uploaded on 05/08/2011 for the course ACCOUNTING 121210 taught by Professor Sdasdas during the Spring '10 term at Albany College of Pharmacy and Health Sciences.

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chapter 4 - UNIVERSITIKUALALUMPUR CHAPTER4 INTERNAL LIQUID...

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