Looking at the microworld with the naked eye
Can the slow motion of something very tiny be similar to a quicker motion of something considerably larger?
Maciej LisickiMaria Ekiel - Jeżewska
What does it mean 'similar'? Identical shape is not enough...
http://www.tukan-webdesign.de/krusenstern2/Krusens%20neu%20als%20Taste%20m.Schatt400x383.jpghttp://www.mmszczecin.pl/8307/2007/9/20/klub-czytelnika-zaprasza?category=interwencje
L
ρ, μU
Reynolds number
LU
Re
L
U
,Density and viscosity of the liquid
Flow velocity
Characteristic size
LU
Re
L
U
,
Flow similarity principle
Two flows having the same Reynolds numbers have the same character.
Low viscosity, little size,low velocities
= High viscosity, big size,high velocity
LU
Re
Low viscosity + little objects
Welcome to the microworld!
Rhodobacter E. coli
Howard Berg’s Laboratory
BACTERIA IN WATER
High viscosity + large objects
MACROWORLDMICROWORLD
Re
Flows with similar Reynolds numbers are similar!
Instead of looking at swimming microobjects, we can observe large bodies but in a Very Viscous Liquid!
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