paraffin wax deposition and fouling

The boundary layer theory used to calculate the velocity ad
6.4 Discussion
tube.
18.7 at the wall to about 17.5 near the centre of the heat exchanger
wall temperature Tw = 32°C. The Prandtl number ranged from about
— 61 —
particles on the boundary layer could therefore not be included.
T can be plotted. As an example this was done for run C8-20 with
but no information was found on its applicability to situations where
calculations of temperature profiles for common heat transfer problems
viscosity in the basic boundary layer theory and variable Prandtl
deposition occurs simultaneously. Any distortion effects of wax
number was also included in the evaluation of the dimensionless
temperature.
temperature profiles was derived from data obtained in isothermal
as vindicated by the results of the analysis.
turbulent flow with air (45). It has however proven valid in
the cooling water temperature and the cloud point was great enu;h
paraffin wax in kerosene boing 3—4°C below the cloud point (se&
computer program. This was a concern but proved a valid assumption
Appendix 1) meant that a thin boundary layer suspension or slurry
fluctuating in nature, ory average values could be supplied to the
with the eerimenta1 bulk temperature. The cloud point was there
the selected wall temperature is equal or close to the solution
- - 0
cloud point, the calculated temperature profile corresponds well
existed. The above would only e true where the aifference cezween
fore the temperature of that surface representing the effective
DoUndary to tae 110w in tne tuoe passage. The pour p0iflt o: 5 /54 C
The advent of modern computers allowed the inclusion of variable
Because the paraffin wax in kerosene fouling system was
Most of the results given in previous sections showed that, if