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[doun-kuhm-er] /ˈdaʊnˌkʌm ər/
a pipe, tube, or passage for conducting fluid materials downward.
Origin of downcomer
1865-70; down1 + comer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for downcomer
  • 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.
  • Clean gravel returns to the filter as required through the downcomer pipes.
  • downcomer pipes deliver the air to open concrete channels below the plates.
  • From the steam drum, gravity will cause the water to flow downward through the downcomer section.
  • The boiler shall have a sufficiently sized downcomer to provide natural internal circulation.
British Dictionary definitions for downcomer


a pipe that connects a cistern to a WC, wash basin, etc Also called downcome
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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