The effects of drag-reducing polymer additives on oscillatory fluid flow, particularly the damping of small-amplitude gas bubble pulsation and liquid column oscillation, were investigated. The damping of bubble pulsation was investigated both analytically and experimentally. The analytical investigation showed that the elasticity of the viscoelastic liquids opposed the viscous effects on the damping of bubble pulsation. On the experimental side, an apparatus was designed to produce gas bubbles of uniform size. The performance of the apparatus was satisfactory. The experimental results of the effects of Polyox additives on the damping of bubble pulsation were in agreement with the theoretical analysis. However, the results of the effects of the Separan additives would suggest the presence of anomalous extensional viscosity effects on the damping of bubble pulsation. The effects of the polymer additives on bubble formation and sound radiation were investigated. The effects of the polymer additives on the damping of liquid column oscillation were investigated experimentally. It was found that the steady-state rheological properties of the visco-elastic liquids can adequately describe their liquid column oscillatory flow. The absence of the effects of the solutions elasticity is attributed to the smallness of their relaxation time in comparison with the time period of the liquid column oscillation.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:641169 |
| Date | January 1978 |
| Creators | Ayyash, Saud Yousif Abdul Rahim |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/10685 |
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