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Volume 71 - September 1967

Contents

Page 12 of 17

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Technical Notes

  • A Method of Measuring the Concentration of Certain Polymers in Dilute Aqueous Solutions

  • Y. Goren, P. O. Kane, J. F. Norbury
  • Published online by Cambridge University Press:
    04 July 2016, pp. 381-383

  • A technique has been devised for measuring the concentration of “Polyox” in dilute aqueous solutions. “Poly-ox”* is one of those polymers whose addition to water in low concentrations causes a reduction in skin friction (if the Reynolds number is sufficiently high) in turbulent flow through a pipe or boundary layer. (See, for example, ref. 1.) The analytical method is probably applicable to other polymers having this property, and it should be generally useful in this field of research. For example, in any experiment in which a polymer solution is injected at a point in a boundary layer, the method could be used to determine the distribution of polymer concentration at downstream sections. It is based on polarography, a well-established tool of chemical analysis of which an excellent account is given in ref. 2.

Back matter

  • AER volume 71 issue 676 Cover and Back matter

  • Published online by Cambridge University Press:
    04 July 2016, p. b1
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  • On the Approximated Expression of the Axial Perturbation Velocities in the Actuator Disc Theory

  • G. Bussi
  • Published online by Cambridge University Press:
    04 July 2016, pp. 799-800

  • Fluid motion in an annulus is described, in the absence of radial velocity, by the simple radial equilibrium equation. This equation is used to describe the flow in an axial turbomachine some distance ahead and behind the rows of blades, where radial displacements have already decayed.

    In the neighbourhood of and between the blades the fluid motion is far more complex than the flow in the radial equilibrium condition. Most of the difficulties of the real problem can be overcome by introducing the actuator disc mathematical model. The actuator disc divides the complex flow field into two simpler fields, each free from blades, i.e. a simple annulus. The equations of motion in each field are easily linearised by posing some particular restrictions concerning the velocity profiles and by conceiving the velocity as the sum of the radial equilibrium solution and of small perturbed quantities. These are radial and axial perturbation velocities vanishing far from the actuator disc, and are given by a perturbation velocity potential.

Back matter

  • AER Volume 71 issue 675 Cover and Back matter

  • Published online by Cambridge University Press:
    04 July 2016, p. b1
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Front matter

  • AER Volume 71 issue 679 Cover and Front matter

  • Published online by Cambridge University Press:
    04 July 2016, pp. f1-f3
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Page 12 of 17