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downcomer

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downcomer

[′dau̇n‚kəm·ər]
(building construction)
downspout
(chemical engineering)
A method of conveying liquid from one tray to the one below in a bubble-tray column.
(engineering)
In an air-pollution control system, a pipe that conducts gases downward to a device that removes undesirable substances.
(mechanical engineering)
A tube in a boiler waterwall system wherein the fluid flows downward.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

downcomer

1. A downspout.
2. Any pipe in which the flow is substantially vertical.

downspout, conductor, downcomer, downpipe, leader, rain leader, rainwater pipe

downspout
A vertical pipe, often of sheet metal,
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive
The nitrogen gas enters cold legs through ECCS nozzles first and then migrates to hot legs through the vessel downcomer and hot leg leak simulating lines that connect the downcomer to the hot legs, as shown in Figure 1.
ROSA/LSTF Tests and Posttest Analyses by RELAP5 Code for Accident Management Measures during PWR Station Blackout Transient with Loss of Primary Coolant and Gas Inflow
The coolant is subsequently drawn into the pump hydraulics and forced radially out to the downcomer, where it flows to the bottom of the RPV cavity, turns 180 degrees and flows up into the core to complete the flow cycle.
Westinghouse: overcoming the economies-of-scale issues
Although the riser is aerated, the downcomer is gas-free because nearly all bubbles are escaped from the free liquid surface of degassing zone if the superficial gas velocity is relatively low [2].
A new developed airlift reactor integrated settling process and its application for simultaneous nitrification and denitrification nitrogen removal
"We saw milli-amps of current flowing up and down the downcomer," said Brehm.
SOLVING LIGHTNING PROBLEM FOR POWER PLANTS
However, for liquid jet with a downcomer even after gas entrainment occurs at the plunging point, there is almost complete recirculation of the entrained gas unless certain momentum is imposed on the gas bubbles to move downward.
Energy efficiency of two-phase mixing in a modified bubble column
The thick line is the response of the model with four holdup terms which includes the vapour holdup while the thin line is the response of a model with two holdups, but that includes the holdup of the liquid in the downcomer. Obviously, there is a significant difference in the two responses that would influence the tuning of the column control.
Modeling separation processes with nonequilibrium models
The flooding, often caused by downcomer blockage, is one of the more readily identifiable column fault.
Industrial revolution through nuclear technology
The COMMIX model included the cold leg entrance into the downcomer, the downcomer, the lower plenum, and the core.
Advances in parallel computing for reactor analysis and safety
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