Prediction of batch heat transfer coefficients for pseudoplastic fluids ...

11-5
fluid-1m.peller categories..
although not significp~tly
In three others it is better,
better at the 90% level. In
the remaining four categories the correlations have about
the same accuracy..
In the fO'llr Nevltonian fluid categories"
Correlation A is significa..ntly better than Correlation G
for the w.rbines only.
Thus the author believes that
Correlation G is to be recommended over Correlation A, so
far as predictive power is concerned.
Correlation C, a slightly modified form of the theoretical
Correlation A, in the previous chapter was sho~m
to
be the best of the three theoretically based correlations ..
If Correlations C and G are compared by the values of the
errors realized liJhen using them the hio equations are about
equal.
In general correlation C fits the data slightly better
than correlation G although the latter fits the data for n=
0 .. 36 somewhat better than does the former. Comparison of
the var:i,ances shows that there is significant improvement
for this fluid Hhile the remainder of the points are represented
equally 'Hell by ei ther correlation..
The improvement
in this one case is probably due to the variable exponent
on the consistency ratio.
Comparison of correlation C Hith correlation E elbninates
the improvement due to the variable exponent for the consistency
ratio and is a good method for comparing the tI.ro different
apparent viscos i ties..
Comparison of the average errOl'S and
variances shoHS that there :is no difference in the accuracy