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Prof. Eugeniusz Kamiński (1923-1995)

Kamiński J., Pokorski J.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

2015

z. 4/104

5--7

The flow of viscoelastic fluids in an opposed jets rheometer and a Fano flow rheometer

Wilkes C., Gampert B.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

319-324

The elongational rheometer used for this work is an opposed jet rheometer, which allows elongational flow measurements of highly dilute polymer solutions. The polymer concentrations can be lower than the critical concentration under steady state conditions and lower than the critical concentration in the case of flow conditions. A further experimental set up was used for characterising the viscoelastic fluids. The working method of this apparatus is the tubeless siphon or Fano flow, which can be understood approximately as the reverse fibre spinning process. The beginning of the fibre spinning process can be applied in order to determine the critical concentration . The experimental investigations undertaken here were carried out using a commercial, anionic polyacrylamide with a relatively high molar mass and hydrolysis factor. The polyacrylamide was dissolved in highly pure water. Sodium chloride with different concentrations was added to the solutions to control the partial neutralisation of negative charges at the ends of the polymer chains.