| Summary: | 碩士 === 淡江大學 === 化學工程學系 === 85 === Conjugated Graetz problems by considering the effects of recycle
on the heat and mass transfer through a parallel-plate channel
with uniform wall temperature are studied by using an orthogonal
expansion technique. The problem is solved by assuming fully
developed laminar velocity profiles in the channel, ignoring
axial conduction, and constant fluid properties. The effects of
the location of recycle, and comparing the results with that in
an open conduit (without an impermeable plate inserted and
without recycle) were discussed. Analytical results show that
the preheating and residence-time are the two effects to
dominate of the heat transfer behavior. When Graetz number is
small, the heat transfer efficiency of an open conduit is better
than that with reflux at both ends. However, the introduction of
reflux still has positive effects on the heat transfer for large
Graetz number.
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