# Resources - Evan Lemley

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```					Viscosity Presentation
By
Team Eight
Objective
 To determine how fluid a liquid really is by
measuring its viscosity.
 We will simply see how fast a sphere falls
through a fluid. The faster the sphere falls,
the lower the viscosity. The slower the
sphere falls, the higher the viscosity.
Material List / Price List
   Materials
 Marbles (steel and glass) -\$1.00
 Motor oil (10W-30) -\$2.00
 Graduated cylinder -\$5.00
 Calculator-\$15.00
 Stopwatch -\$4.00
 Ruler -\$1.00
 Thermometer-\$15.00
Method
   The measurement involves determining the velocity of the falling
sphere. This is accomplished by dropping each sphere through a
measured distance of fluid and measuring how long it takes to
traverse the distance. Thus, you know distance and time, so you
also know velocity, which is distance/time.
   The formula for determining the viscosity is decorated with Greek
letters and a squared term, but simply amounts to multiplying some
numbers and then dividing by some others:
   delta p = difference in density between the sphere and the liquid
   g = acceleration of gravity
   a = radius of sphere
   v = velocity = d/t = (distance sphere falls)/(time of it takes to fall)
Data Entry
Type of Fluid                    Water                  Type of Fluid                         Oil
Fluid density (p)                                       Fluid density (p)
Density of sphere (p)                                   Density of sphere (p)
Density Contrast                                        Density Contrast
Radius of sphere (a)                                    Radius of sphere (a)
Gravity (g)                      9.8 m/s2               Gravity (g)                          9.8 m/s2
Fall distance (d)                                       Fall distance (d)

Fluid: Water              Temperature:     °C                         Fluid: Oil                Temperature:    °C
Marble: Steel               Radius:       m                         Marble: Steel                Radius:       m
Trial         d (m)   t (s)   v (m/s)       h(Pa s)                 Trial      d (m)      t (s)   v (m/s)        h(Pa s)

1                                                                   1
2                                                                   2
3                                                                   3
Fluid: Water              Temperature:     °C                         Fluid: Oil                Temperature:    °C
Marble: Glass               Radius:       m                         Marble: Glass                Radius:       m
Trial         d (m)   t (s)   v (m/s)       h(Pa s)                 Trial      d (m)      t (s)   v (m/s)        h(Pa s)

1                                                                   1
2                                                                   2
3                                                                   3
Useful Tables
•g              9.8 m/s2               •Density for water                 1000 kg/m3
•Steel marble density                 8430 kg/m3

•Glass marble density                 2850 kg/m3              •Density for 10W-30                881 kg/m3

•100 Centipoise = 1 Poise               1 Centipoise = 1 mPa s (Millipascal Second)
•1 Poise = 0.1 Pa s (Pascal Second)

Approximate Viscosities of Common Materials
(At Room Temperature-70°F) *
Material                                                   Viscosity in Centipoise
Water                                                                 1 cps
SAE 30 Motor Oil                                                        420-650 cps
SAE 40 Motor Oil                                                        650-900 cps
Castrol Oil                                                           1,000 cps
Karo Syrup                                                            5,000 cps
Honey                                                              10,000 cps
Chocolate                                                            25,000 cps
Ketchup                                                             50,000 cps
Peanut Butter                                                          250,000 cps
Setup Model
Resources
•Interactive Model

•http://www.nasaexplores.com/index.php

•http://www.vp-scientific.com/Viscosity_Tables.htm

•http://www.spacegrant.hawaii.edu/class_acts/ViscosityTe.html

•Cornell University Model

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 views: 8 posted: 3/14/2012 language: pages: 8