paraffin wax deposition and fouling

— A42 —
To evaluate equation f7.6.5 both dimensionless velocity
and distance were given, also the viscosity and Prandtl number.
A83
ain Program
The various subroutines of the program PFLE were controlled by
the main program. It called the subroutines DATA, ‘, ?ROPS and UX
that read the input data and printed out the particulars for each run.
The main program was an iterative one whose purpose was to obtain,
via the subroutines UPROF and TPROF,
the velocity and temperature profiles
or distributions in the heat exchanger tubes used in the fouling studies.
For a given dimensionless distance y+ the dimensionless velocity u+
and temperature T were found.
Knowing T+ the true temperature could. be
deermine and hence the-viscosity.
This viscosity was used to calcuiate
+ + + -
a new u ana T at the same y . ‘nen the caiculatec. viscosity ootainec.
by this iterative procedure changed by less than 0.000001, the iteration
was cansidered completed.
when u+ and T+ had been determined for a given y the distance
from the tube wall y and the velocity and temperature T for that
distance were determined from the following equations as given in the
previous Appendix:
+ u (.
u = —v
.....
u
=
(T —T:)Cp TW
The main program printed out both the dimensionless and true distance,
‘;elocity and temperature.
The physical properties corresponc.ing to the
evaluated temperature were also printed.