Viscous fluids are those that offer resistance to flow. Elastic solids that we are so familiar with exhibit a linear stress strain relationship (in the elastic region, of course ! ). A superposition of both is observed in Viscoelastic materials . In this videos that I collected from Youtube , three famous peculiarities of these materials are shown :
1. The Barus Effect (extrudate swell)
2. The Weissenberg Effect (rod-climbing) : Generally we would observe a vortex when we swirl a liquid like water as it dips but here this stuff behaves very strange . It climbs up the drill !
3. The Kaye Effect (liquid leaping sideways) . A very very interesting video through a High Speed Cam is available below . The experiments that I read about about this effect were done with the hair Shampoo that is used commonly.
