Lecture_19_notes - Chemical Engineering 374 Fluid Mechanics...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1 Chemical Engineering 374 Fluid Mechanics Fall 2011 Single Pipelines Pipelines with friction losses 2 Δ P ρ + Δ v 2 2 + g Δ z = ˙ W u ˙ m - ˙ F ˙ m Δ P ρ + Δ v 2 2 + g Δ z = - fLv 2 2 D - Kv 2 2 Ignoring the Work Term: - F (= - ˙ F/ ˙ m ) One equation in One Unknown Pick Two Points Carefully
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Problem Types Types I and IV are easy. Types II, III require iteration Parameters: Δ P, L, D, V, μ, ρ , ε Equations: Re = ρ Dv/ μ f=f(Re, ε /D) Δ P = fL ρ v 2 /2D 3 Problems I, II, III from Swamee-Jain Relations See Book Page 380 Type I Procedure Re = ρ Dv/ μ f=f(Re, ε /D) Δ P = fL ρ v 2 /2D 4 Find Pressure Drop Solve Re from (1) Solve f from Colbrook Eqn. (2) etc. Solve Δ P from (3)
Background image of page 2
Type II Procedure Re = ρ Dv/ μ f=f(Re, ε /D) Δ P = fL ρ v 2 /2D 5 Find Flow Rate (velocity) Implicit: v appears in (1), (2), (3) Iterate (several ways) 1. Guess f as fully turbulent (where Moody levels off) 2. v from (3) 3. Re from (1) 4. f from (2) 5. Repeat to convergence 1. Guess Re 2. Compute f from (2) 3. v from (3) 4. Re from (1) 5. Repeate OR Type III Procedure Re = ρ Dv/ μ f=f(Re, ε /D) Δ P = fL ρ v 2 /2D 6 Find Pipe Diameter Implicit: D appears in (1), (2), (3)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 14

Lecture_19_notes - Chemical Engineering 374 Fluid Mechanics...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online