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Answer the following about the fluid dynamics behind the rotating disk electrode, for 10 points each.
[10e] Fluid moves toward the rotating disk to replace the fluid pushed outward by this fictitious force, whose magnitude is proportional to angular speed squared times radius.
ANSWER: centrifugal force
[10h] This scientist’s equation predicts the electrode’s limiting current density to be proportional to the square root of rotation speed. With his teacher Lev Landau, he names the thin film flow resulting from pulling a flat plate out of a container of fluid.
ANSWER: Veniamin Levich [or Veniamin Grigorievich Levich or Benjamin Grigorievich Levich; accept Landau–Levich flow; accept Levich equation]
[10m] The fluid flow near the rotating disk is modeled as this scientist’s namesake swirling flow. This scientist also names a repeating pattern formed behind bodies in a fluid, which is created by vortex shedding.
ANSWER: Theodore von Kármán [or szőllőskislaki Kármán Tódor or szőllőskislaki Kármán Tivadar; accept (von) Kármán vortex street; accept (von) Kármán swirling flow]
<Physics>

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Summary

2024 ACF Nationals2024-04-21Y2013.0085%45%0%

Data

BrownIllinois1001020
North Carolina BChicago D0000
Claremont CollegesMcGill100010
Columbia BBerkeley A100010
Cornell AWaterloo1001020
South CarolinaCornell B100010
Georgia TechTexas100010
IndianaVirginia1001020
Iowa StateBerkeley B1001020
Johns HopkinsChicago B1001020
North Carolina AKentucky1001020
MarylandVanderbilt100010
Minnesota AColumbia A100010
HarvardMinnesota B100010
NorthwesternPenn1001020
FloridaToronto A100010
MichiganToronto B100010
Yale BTruman State1001020
WUSTL ARutgers001010
Arizona StateYale A0000