For the third stage of the experiment, we wanted to collect some data on the viscosity of the part, especially when we finally received the steel ball bearings.
 

TEST RESULTS & OBSERVATIONS:
 

To determine the viscosity, we can observe the speed of a steel bearing (sizes of 3/8" and 5/8") when we drop it through the mixture. The camera we used shot at 30 frames per second. Using these, we can determine how many frames it took for it to travel a certain distance.

 

Original Syrup:
 

• ⅜" ball: From 8 sec. (7th frame) @ 50mm to 9 sec. (3rd frame) @ 10 mm

  • Each second is 30 frames.

  • The numbers listed shows the seconds (of the video, which are all posted below) and which frame of that second the height was measured at.

  • The ball traveled 40 mm in 26 frames = 0.0461 m/s
     

• ⅝" ball: From 6 sec. (27th frame) @ 40mm to 7 sec. (9th frame) @ 10 mm

  • The ball traveled 30 mm in 12 frames = 0.0750 m/s

​

Condensed Syrup (1 minute of boiling):
 

• ⅜" ball: From 10 sec. (15th frame) @ 25mm to 11 sec. (18th frame) @ 5 mm

  • The ball traveled 20 mm in 33 frames = 0.0182 m/s
     

• ⅝" ball: From 13 sec. (11th frame) @

• 20mm to 13 sec. (24th frame) @ 5 mm

  • The ball traveled 15 mm in 13 frames = 0.0346 m/s

​

Epoxy:
 

• ⅜" ball: From 5 sec. (5th frame) @ 96 mm to 5 sec. (1st frame) @ 126 mm

  • Each second is 30 frames.

  • The numbers listed shows the seconds (of the video, which are all posted below) and which frame of that second the height was measured at.

  • The ball traveled 30 mm in 4 frames = 0.225 m/s
     

• ⅝" ball:

  • The ball traveled 28.575 mm in 5 frames = 0.171 m/s

​

Viscosity Equation: 

   where d = 3/8" (0.009525 m) or 5/8" (0.015875 m), steel: ρ = 8000 kg/m^3, corn syrup: ρ = 1370 kg/m^3 

               g = 9.81 m/s^2, T = seconds traveled (in frames, where 30 frames/sec), epoxy: ρ = 1110 kg/m^3 

​

• Water - η = 0.0091 poise

​

• ⅜" ball - Original Syrup: η = 71.0 poise

• ⅝" ball - Original Syrup: η = 121.4 poise
   

• ⅜" ball - Condensed Syrup: η = 180.3 poise

• ⅝" ball - Condensed Syrup: η = 263.0 poise

• ​

• ⅜" ball - Epoxy: η = 15.1 poise

• ⅝" ball - Epoxy: η = 55.2 poise

 

RESULT: 
The main focus for this test was to collect data of the viscosity of the syrup. We could see that after 1 minute of boiling syrup, the ball was twice as viscous. With this range, and from the data we collect from using actual epoxy this weekend, we can get a better clue of how all the viscosities match up. We observed that the resin seemed a lot more fluid than the syrup.