paraffin wax deposition and fouling

Increased flowrate and temperature therefore both decrease
increased concentration increases the total number of particles
build up.
the number ofparticles having cohesive properties to deposit while
increases the probability of cohesion.
An increase in wax concentration, at unchanged temperature and
flow conditions, will move the Cloud point temperature interface
away from the wall. More particles will be formed in the extended
boundary layer suspension and the greater number of particles
tion progresses. The main factors causing breakdown of raraffin
shear stresses that decrease and increase respectively, as derosi—
paraffin deposition and fouling are robably he hea: flux and
7.9 Conclusions
— 71 —
The main factors influencing the asymptotic behaviour of
wax deposits are most likely the creation of planes of weakness
The amount of wax that deposits or is removed, giving rise
wax deposited at any one time.
The mechanism of paraffin wax deposition and fouling is
formed in the boundary layer. Fiowra;e and temperature decrease
by greater wax concentration in the bulk solution.
in the fouling studies, is typically 10—20 per cent of the total
probably controilecL by the cohesive properties of the wax particles
the number of particles able to deposit while the umber is increased
present and thereby the deposition.
to the random fluctuations in the overall heat transfer resistances
inside the deposits and the increase in shear stresses as deposits