英语翻译As previously mentioned,the common problem withreducing

英语翻译
As previously mentioned,the common problem with
reducing the transverse spacing in order to increase heat
transfer surface area is that the flow passage area also
decreases resulting in increased pressure drop and blockage
of the heat exchanger due to deposit build up between
the closely spaced tube rows.Fig.8 shows how
the five tube bundle arrangements numerically investigated
perform in terms of deposition rate and deposition
rate distribution between the tube rows.Comparing the
arrangements at the larger transverse spacing,it is evident
that the streamlined tube shapes of the elliptic
and the DDEFORM tubes lead to a reduction in the
overall deposition rate,which is most evident in the
downstream tube rows,although even the first row
shows a reduction in the order of 30–50%.However,
as shown previously,at the large transverse spacing
the benefits with regards to both heat transfer rate and
pressure drop are not favourable.On the other hand,
by looking at the closely spaced arrays,it can be seen
that the deposition rates are still at 26% and 44% of
those of the standard arrangement with circular crosssectional
tubes but heat transfer is significantly higher
(see Fig.6) and pressure drop lower (see Fig.7).The
DDEFORM tube shows a superior performance over
the elliptic one in terms of deposition rates.The different
behaviour of the bundles with non-circular tubes is further
explored in the next section
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