downdraft


Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.
Related to downdraft: microburst

downdraft

[′dau̇n‚draft]
(physics)
A current of air or other gas that travels downward, as during a thunderstorm or in a mine shaft.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

downdraft, Brit. downdraught

1. A downward current of air in a chimney or flue, often carrying smoke with it.
2. A downward current of air resulting from the passage of air across a window surface, which cools it and increases its density so that it moves downward.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

downdraft

downdraft
A relatively small-scale downward current of air. These are common near cumuliform clouds, in precipitation areas, and on leeward side of large features. They pose risks to light aircraft and helicopters, especially those flying near the ground.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In the post-maturity dissipation stage, when downdrafts dominate, the storm's footprint on the ground beneath can expand in the form of an outwash far beyond the edge of the storm.
Dry air in the mid-levels increases evaporation in downdrafts, increasing the risk of microbursts and downbursts.
Interestingly, the primary RFGF near the developing circulation did not surge southward until the end of the organizing stage (0022 UTC), waiting instead for an occlusion downdraft to develop and strengthen on the south side of the circulation (Figure 3(f)).
The gas yield of 2.51 [Nm.sup.3]/kg obtained for downdraft gasification of OPF was found to be slightly higher compared to those of empty fruit bunches (2.04 [Nm.sup.3]/kg) and sawdust (2.0 [Nm.sup.3]/kg) reported in the literature [7], implying the significant potential of OPF biomass as a source of fuel gas generation.
Clean Wind Energy Tower, through its fully-controlled unit Clean Wind Energy Inc, designs and will build large downdraft towers, utilising benevolent, non-toxic natural elements for power generation and clean water.
As designed, the company anticipates that each Downdraft Tower could generate enough electricity to power up to 1,600,000 homes using the guidelines set forth in the California Statewide Residential Appliance Saturation Study, 2004.
Cpl Wright started giving Pearson first-aid and as the Chinook arrived, shielded him from the downdraft.
The Tornado TCF 700/40 custom booth, which measures 7 m x 4 m x 2.66 m, provides a downdraft airflow up to 24,000 [m.sup.3]/hr to ensure even temperatures throughout the baking process, and even airflows for efficient removal of overspray.
Ace Industrial Products offers the Model 72-923 downdraft table for eliminating dust and smoke particulate.
It is caused by the tremendous updraft and downdraft winds within the thunderstorm.
Other available attachments include a downdraft table, dual articulated arms, single articulated arms and a long reach hose.
Donaldson's "High Efficiency Downdraft Bench" is designed to enhance the air quality of mailrooms during the mail sorting and handling process.