downcomer

[doun-kuhm-er]
noun
a pipe, tube, or passage for conducting fluid materials downward.

Origin:
1865–70; down1 + comer

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World English Dictionary
downcomer (ˈdaʊnˌkʌmə)
 
n
Also called: downcome a pipe that connects a cistern to a WC, wash basin, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The reactor vessel was modeled with two core channels and split downcomer for a
  base calculation.
Natural circulation flow was induced by the difference in density between the
  riser and downcomer pipes.
There the liquid is separated and sent back down via a side downcomer.
Each downcomer is fitted with plates of only one range.
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