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It was revealed that the empirical correlations
for constant temperature boundary condition
is quite in agreement with the present data in
low Dean number region in counter-flow,
while these correlations overestimate the
present results in parallel-flow.
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From the results of the present study, it was found out
that the shell-side heat transfer coefficients of the coils
with larger pitches are more than the ones with smaller
pitches.
Besides, it was seen that the shell-side Nusselt numbers
of counter-flow configuration were slightly more than
the ones of parallel-flow configuration.
Finally, it was observed that the overall heat transfer
coefficients of counter-flow configuration are 0–40%
more than those of parallel-flow configuration.
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