Viscosity - Center for Polymer Studies

spreadeaglerainMechanics

Oct 24, 2013 (4 years and 2 months ago)

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Viscosity

for
students

of Physics

Tom Ramsey

Mentor High School

Mentor OH 44060

tramsey@ncweb.com

Isaac Newton studied

viscosity

Viscosity: Connecting with Chemistry and Biology

Does air resistance increase as v or v2???

Air resistance produced by collisions of gas molecules

Air Resistance Increases with Temp


Proportional to v for slow speeds


Proportional to v2 for higher speeds

Because of turbulence


Reynolds number provides dividing line

Visc.smd

Viscosity/friction in a fluid

Decreases with increasing Temp

Produced by decreasing
intermolecular forces

Non
-
Newtonian Fluids


Viscosity_liquid.smd

3 oils/5 temp

Dr. Jean Leonard Marie
Poiseuille Checks his heart

Applications

Bernoulli’s equation


Non
-
newtonian fluids


Pouiselle’s Equation:


Q ~ r4


Alt. Models:fractals,

percolation

Introduction

Provides a connection between math,chemistry

Biology and Physics


Provides students a chance to look at

alternate scientific models.


Provides a molecular explanation as an alternate

To the usual continous model



Intended Audience

AP,Honors, Regular Physics


Builds on what students have learned

In other classes

Adjustments/Adaptations

None required
-
all levels of Physics

can handle

Placement in Curriculum

After kinematics and dynamics


Some concepts such as Pressure were

learned in Chem

Goals and Objectives

Determine the relationship between

temp and viscosity for both gases and

liquids

Compare different models for viscosity

understand the usefulness of Reynold’s number

As a criterion for distinguishing turbulent and nonturbulent flow.

Give reports on the application of viscosity to other fields such

As Biology, Chemistry and Engineering

Day 1: Air Resistance(Wet Lab)

Coffee Filter Lab



F
a

v or F
a

v2 ????


Cedar Point/Six Flags


Cold Air+Warm Air

Day 2: Macro


Micro(Computer)

Visc.smd



F
a

v (Stokes)


F=
D
P/
D
t * A


h

versus m,T

Time Line

Day 3: Kinetic Karnival Video:

“Viscosity”

Lab:Marbles in Oil(Wet)

Non
-
NewtonianFluids (Corn
Starch,Slime etc).

h

versus T for liquid



Day 4: liquid.smd(Computer)




Demo: KMn04 in warm H2O(wet)

H increases with temp in gas(collisions
increase)but decreases in liquid(
intermolecular forces)


Day 5 Bernoulli’s Equation


Continuity Equation

Endless numbers of examples

From groundhogs, to baseballs to
airplane wings


Day 6 Poiseulle’s Equation /Heart


Q ~ r4

Relate the velocity profile of a fluid in a
pipe to Poiseulle’s Equation

Day 7 bernoulli_xtal.smd

Airfoil crystal

Using SMD students build a crystal in
the shape of an airfoil

Day 8: Student Reports

5 minute seminar

Examples from other
sciences/enginering

Resources

1 computer per 2/3 students

Smd program with viscosity files

for liquid and gases.


Standard lab equipment(hot plates,

graduates, coffee filters,metersticks


for wet labs)

Bibliography

Transtronics:Viscosity Basics

Fluid Dyanmics Online Textbook

Vicosity of Lava Flows

Wolfram Research(Mathematica) Navier Stokes Equation

Mathematica model of Galileo's Experiment

BU software/curricular material

Physics by Douglas Giancoli 3
rd


Schaum’s Outline Series:

Fluid Dynamics


Solving Problems in Fluid Mechanics

Vol2 by JF Douglas 1967


Life’s Devices by Steven Vogel

Princeton University Press

ISBN0691024189

Websites
:

References
: