The thesis describes research into the general
motion of the components of a solid liquid mixture flowing in
a horizontal circular pipe. The velocity gradient and
concentration distribution of the solid particles have been
investigated using high speed photography of coloured marker
particles, made visible by matching the refractive indices
of the bulk solid and the liquid. These results have been
compared with concentration distributions obtained by gamma
The three dimensional measurements of particle
velocity distribution and concentration have been discussed
in terms of a dynamic equilibrium between the various
influences acting upon the particles. This model is supported
by measurements of lateral particle movements.
Investigations into methods of measuring the liquid
velocity distribution using laser anemometry and photochromic
dyes are reported and the feasibility of applying these
techniques to a hydraulic conveying system is discussed.
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.