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Title of Journal: Rheol Acta

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Abbravation: Rheologica Acta

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Springer-Verlag

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DOI

10.1002/asna.19262270601

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1435-1528

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Molecular orientation in nonNewtonian flow of dil

Authors: Simon J Haward Jeffrey A Odell
Publish Date: 2004/02/04
Volume: 43, Issue: 4, Pages: 350-363
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Abstract

A novel approach is presented to study the benchmark problem of flow around spheres in model dilute solutions of monodisperse samples of atactic polystyrene in dioctyl phthalate Spheres are held “stationary” on flexible cantilevers of known springconstant k while the polymer solutions are pumped past at controlled flow rates allowing access to a wide range of Deborah number In this way the nonNewtonian forces experienced by the spheres can be measured as a function of Deborah number while detailed observations and measurements of birefringence are made enabling assessment of macromolecular strain and orientation In addition the flow field around a sphere has been measured in an aPS solution Experiments have been performed on a single sphere and on two spheres axially aligned in the direction of flow The extensional flow around the downstream stagnation point of the single sphere is found to play a pivotal role in the development of molecular strain and stress resulting in flow modification and subsequent nonNewtonian behaviour The flow birefringence in the wake is found to modify severely the flow around a second downstream sphere affecting the nonNewtonian forces encountered by the second sphere This provides an explanation for the time interval dependent terminal velocity often observed when two spheres follow the same path through viscoelastic liquids


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  1. Effect of morphology on the interfacial slip of immiscible polypropylene/polystyrene blends
  2. Amorphous and crystalline states of ultrasoft colloids: a molecular dynamics study
  3. A hierarchical multi-mode MSF model for long-chain branched polymer melts part II: multiaxial extensional flows
  4. Novel bitumen/isocyanate-based reactive polymer formulations for the paving industry
  5. Can dynamical mechanical measurements predict brittle fracture behaviour?
  6. Self-reinforcement of polymers as a consequence of elongational flow
  7. The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
  8. Influence of the initial cooling temperature on the gelation and yield stress of waxy crude oils
  9. Molecular architecture and linear viscoelasticity of homogeneous ethylene/styrene copolymers
  10. Flow analysis of the weld line formation during injection mold filling of thermoplastics
  11. Squeeze flow of soft solids between rough surfaces
  12. The contribution of frictional contacts to the shear strength of coarse glass bead powders and slurries
  13. End effects in rotational viscometry II. Pseudoplastic fluids at elevated Reynolds number
  14. Rheological behaviour of a high-melt-strength polypropylene at elevated pressure and gas loading for foaming purposes
  15. The effect of premature wall yield on creep testing of strongly flocculated suspensions
  16. Rheological and morphological properties of PA6/ECO nanocomposites
  17. Orientation distribution in injection molding: a further step toward more accurate simulations
  18. Fractal analysis of viscoelastic data with automated gel point location and its potential application in the investigation of therapeutically modified blood coagulation
  19. Modeling confinement in polymer nanocomposites from linear viscoelasticity data
  20. Linear viscoelasticity of styrenic block copolymers–clay nanocomposites
  21. On exact solutions of the flow equations for Bingham visco-plastic fluids through an eccentric annular cross-section
  22. A computational extensional rheology study of two biofluid systems
  23. Power-law creep and residual stresses in a carbopol gel
  24. Electrorheological response of SnO 2 and Y 2 O 3 nanoparticles in silicon oil
  25. Generation of inkjet droplet of non-Newtonian fluid
  26. Scaling and mesostructure of Carbopol dispersions
  27. Study of the non-isothermal glass fibre drawing process
  28. Influence of molecular parameters on the stress dependence of viscous and elastic properties of polypropylene melts in shear
  29. An error-minimizing approach to inverse Langevin approximations

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