title: Rod-climbing effect in Newtonian fluids.
abstract: When a rotating rod is brought into a polymer melt or concentrated polymer solution, the meniscus climbs the rod. This spectacular rod climbing is due to the normal stresses present in the polymer fluid and is thus a purely non-Newtonian effect. A similar rod climbing of an interface between two fluids has therefore been taken as a signature that one of the fluids exhibits normal stress effects. We show here, however, that the effect can occur with simple Newtonian fluids: it occurs when a Taylor-Couette instability happens in the less viscous of the two liquids but not in the more viscous one.
authors.affiliation: Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24 Rue Lhomond, 75231 Paris cedex 05, France. bonn@lps.ens.fr
authors.forename: Daniel
authors.initials: D
authors.lastname: Bonn
authors.forename: Mathias
authors.initials: M
authors.lastname: Kobylko
authors.forename: Steffen
authors.initials: S
authors.lastname: Bohn
authors.forename: Jacques
authors.initials: J
authors.lastname: Meunier
authors.forename: Alexander
authors.initials: A
authors.lastname: Morozov
authors.forename: Wim
authors.initials: W
authors.lastname: van Saarloos