Rod-Climbing Effect in Newtonian Fluids

Rod-climbing effect in Newtonian fluids.

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...

Non-newtonian Fluids

Time-periodic Electroosmotic Flow of Non-newtonian Fluids in Microchannels

The alternating current electroosmotic flow of a non-Newtonian power-law fluid is studied in a circular microchannel. A numerical method is employed to solve the non-linear Poisson-Boltzmann and the momentum equations. The main parameters which affect the flow field are the flow behavior index, the dimensionless zeta potential and the dimensionless frequency. At very low dimensionless frequenci...

Ordering in charged rod fluids

The statistical mechanics of a dense fluid of charged rods is considered, and the corresponding phase diagram is calculated, using a collective coordinate transformation. A first-order isotropic-nematic phase transition is found, as suggested by a recent experiment. Collective coordinate transformations have been widely used in many different areas of physics. A well known example where they ar...

Non-Newtonian Fluids: An Introduction

The objective of this chapter is to introduce and to illustrate the frequent and wide occurrence of non-Newtonian fluid behaviour in a diverse range of applications, both in nature and in technology. Starting with the definition of a nonNewtonian fluid, different types of non-Newtonian characteristics are briefly described. Representative examples of materials (foams, suspensions, polymer solut...