Don Pettit & Mark Weislogel : Strange Geometry

Moving liquids without gravity aboard the International Space Station can be tricky – if there’s no “down” then water won’t flow downhill. Capillary Flow Experiments-2, or CFE-2, a physical science investigation looking at fluid physics, is a set of experiments exploring how fluids move up surfaces in microgravity.
Source: Strange Geometry – Yes, It’s All About the Math
 

Interview with Mark Weislogel, Principal Investigator, Capillary Flow Experiments-2
Mark Weislogel talks about the Capillary Flow Experiments-2, which is on the International Space Station.
 

 
Surface tension of water in microgravity
(Part 1 of 2) In this experiment Expedition Six NASA ISS Science Officer Don Pettit demonstrates the surface tension of water.
 

 
Surface tension of water in microgravity #2
(Part 2 of 2) In this experiment Expedition Six NASA ISS Science Officer Don Pettit demonstrates the surface tension of water.
 

 
Episode 1: Dancing Droplets
 

 
Challenge Question: In the end of the video, Dr. Pettit put a nylon knitting needle near the syringe used to squirt water droplets onto the Teflon knitting needle. Why did Dr. Pettit need a nylon needle near the injected drops and why must the other needle be Teflon?

Check out the answer
 
Episode 2 : Bistro-nauts

Challenge Question: Why can’t you use a regular cup in microgravity?
 

 
Check out the answer
 
Episode 3 : Thin Film Physics
 

 
Challenge Question: Why does the shape of the water sheet affect the direction of the Marangoni convection?

The answer
 
Episode 4: Lenses and Vortices
 

 
Challenge Question: How does the viscosity of the fluid influence a vortex?

The answer
 
 
Episode 5: Fun with Antibubbles
 

 
Challenge Question: When the water sphere rotates, why do the bubbles center themselves?

The answer
 
Episode 6: Earth in Infrared
 

 
Challenge Question: Why do plants appear red in infrared pictures and cities grey?

The answer
 
Episode 7: Space Soundwaves
 

 
Challenge Question: Why does Don use low frequencies to get the water to jiggle?

The answer
 
Episode 8: Goo!
 

 
Challenge Question: Don’s cornstarch solution is a shear-thickening non-newtonian fluid. What would change if Don used a shear-thinning fluid such as ketchup?

The answer
 
Episode 9: Electric Didgeridoo
 

 
Challenge Question: Why does the amount of water on the speakers affect how often droplets are ejected?

Submit Your Challenge Answer at
http://ultron.aps.org/forms/aps.cgi?ID=6000
 
 
 
 

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About benvitalis

math grad - Interest: Number theory
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