RheologyRheology

Capital UniversityCapital University

Everything FlowsEverything Flows

The Greek letters on the hourglass logo of The Society The Greek letters on the hourglass logo of The Society of Rheology— panta rei (sometimes pronounced “ of Rheology— panta rei (sometimes pronounced “ panta rei”)—may be translated “everything flows.” panta rei”)—may be translated “everything flows.”

This phrase (or philosophy) is attributed to the This phrase (or philosophy) is attributed to the Greek philosopher Heraclitus of Ephesus (536–470 Greek philosopher Heraclitus of Ephesus (536–470 BCE) and is taken from the more complete quote: BCE) and is taken from the more complete quote: “Everything flows and nothing abides; everything “Everything flows and nothing abides; everything gives way and nothing stays fixed.” The Society gives way and nothing stays fixed.” The Society

motto was suggested by Eugene Cook Bingham and motto was suggested by Eugene Cook Bingham and it reflects the field of study of rheology — it reflects the field of study of rheology —

deformation and flow. deformation and flow.

From http://www.aip.org/tip/INPHFA/vol-10/iss-2/p29.html

Vocabulary for TodayVocabulary for Today

RheologyRheologyViscosityViscosity

Non-Newtonian FluidsNon-Newtonian FluidsPolymerPolymer

ViscosityViscosity

http://en.wikipedia.org/wiki/File:Viscosity.gifhttp://en.wikipedia.org/wiki/File:Viscosity.gif

Viscosity and WaterViscosity and Water

http://entertainment.howstuffworks.com/water-blaster1.hhttp://entertainment.howstuffworks.com/water-blaster1.htmtm

Water's viscosity can be represented by a coefficient that Water's viscosity can be represented by a coefficient that does not vary.does not vary.

Non-Newtonian FluidsNon-Newtonian Fluids

http://www.youtube.com/watch?http://www.youtube.com/watch?v=f2XQ97XHjVwv=f2XQ97XHjVw

Another Non-Newtonian FluidAnother Non-Newtonian Fluid

http://web.mit.edu/nnf/research/http://web.mit.edu/nnf/research/phenomena/slug.htmlphenomena/slug.html

PolymerPolymer

A chain of molecules with A chain of molecules with a repeating pattern. a repeating pattern.

Such as DNA (and other Such as DNA (and other common everyday life common everyday life

things)things)

Patterns—kinesthetic then spaghetti

At last: Gak!At last: Gak!

Borax causes the Borax causes the glue molecules glue molecules to organize in to organize in

chains. chains.