{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Chapter_4 - CHAPTER4 PIPESANDCONDUITS Objectives...

This preview shows pages 1–16. Sign up to view the full content.

CHAPTER 4 INTERNAL LIQUID FLOW IN  PIPES AND CONDUITS

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
Objectives i. employ Bernoulli’s equation in flow  measurement ii. identify major losses iii. identify minor losses

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Flow Classification Reynolds's Experiment
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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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.
Flow Classification Laminar (Viscous) Filament of dye

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Flow Classification Transition Filament of dye
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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Flow Classification Turbulent Filament of dye
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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.
Reynolds Number - Used to determine whether a flow is laminar or  turbulent.  - Reynolds Number is dimensionless. - Re < 2000: Laminar Flow - Re between 2000 to 4000 : Transitional Flow - Re > 4000 : Turbulent Flow

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Reynolds Number Where: ρ = density, kgm -3 u = average velocity , ms -1 d = diameter of the pipe, m μ = fluid viscosity,     kgm -1 s -1 μ ρ ud = Re
Reynolds Number Example:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 52

Chapter_4 - CHAPTER4 PIPESANDCONDUITS Objectives...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online