P2207_fall10_lecture35 - for laminar flow only!! The flow...

Info iconThis preview shows pages 1–24. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 35
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
Today: Fluids in motion Bernoulli’s Equation Measuring air speed
Background image of page 3

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

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
2 1 2 1
Background image of page 6
Background image of page 7

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

View Full DocumentRight Arrow Icon
Air flows through a tube with a constriction. Where is the pressure highest ? flow A B C A. at A B. at B C. same at both A and C D. not enough information
Background image of page 8
Bernoulli: For flow at constant height , if v , p Some Applications
Background image of page 9

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

View Full DocumentRight Arrow Icon
Measuring Air Speed At Hole A, air speed v A =0. At Hole B, air speed v B > 0. By Bernoulli’s equation, p A + 1/2 v A 2 = p B + 1/2 v B 2 v B = [2(p A – p B )/ ] 1/2
Background image of page 10
Background image of page 11

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

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

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

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

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

View Full DocumentRight Arrow Icon
Perfume atomizers Flowing air creates p that pushes fluid out of container.
Background image of page 16
Airfoils in aircrafts? Air must travel a larger distance over the top of an airfoil than over the bottom. air velocity v top > v bot , p top < p bot Lift Force F L ~ p A wing Lift Force But: Bernoulli's equation is
Background image of page 17

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

View Full DocumentRight Arrow Icon
Background image of page 18
Background image of page 19

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

View Full DocumentRight Arrow Icon
Background image of page 20
Background image of page 21

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

View Full DocumentRight Arrow Icon
Background image of page 22
Background image of page 23

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

View Full DocumentRight Arrow Icon
Background image of page 24
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: for laminar flow only!! The flow of air is highly turbulent here! The Bernoulli principle acting on an umbrella Same principle used in sailing can go faster than wind! Wind damage to buildings v inside ~0, v outside &gt;&gt;0 p = p in p out &gt;&gt;0 building &quot;explodes! E.g.: v outside = 360 km/h (~220 mi/h) p = (1/2) air v out 2 ~ 6000 Pa (~ 0.06 p atm ) Upward force on 80 m 2 house roof: p A ~ 5 10 5 N ~ 50 tons! Hancock Building (Boston, 1973): Ventilation of prairie dog burrows v 1 v 2 v 1 &gt; v 2 p 1 &lt; p 2 What is the pressure at the top of the siphon? h p A. p B. p + gh C. p gh D. less than p gh E. greater than p + gh d...
View Full Document

This note was uploaded on 12/18/2011 for the course PHYS 2207 at Cornell University (Engineering School).

Page1 / 24

P2207_fall10_lecture35 - for laminar flow only!! The flow...

This preview shows document pages 1 - 24. Sign up to view the full document.

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