Air flow field near a welding exhaust hood

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Local ventilation is the most important method in the control of welding fumes. The present practice for dimensioning local exhaust is to select capture velocity and then calculate the required air flow, assuming that the contaminant source is located on the hood center-line. Empirical and analytical formulas for these centerline velocities have been derived for simple exhaust hood configurations. However, in more complex cases the velocities may be difficult to estimate. In this study a turbulent air flow field for a flanged welding exhaust hood was calculated numerically using the FLUENT computer code based on the finite volume method. The turbulence model used in the simulation was the standard two-equation κ-ε turbulence model. The accuracy of the calculations was verified by experimental measurements conducted under controlled conditions. The air velocities were measured with a laser-Doppler anemometer, which is a nonintrusive optical measurement method. The results showed that the complex shape of the welding hood has little effect on the air velocities in front of the exhaust hood. The air flow into the unobstructed exhaust hood can be predicted quite accurately provided that the calculation grid and the calculation domain are properly chosen. The results give guidelines for the proper position of the hood relative to the welding point.

Original languageEnglish
Pages (from-to)101 - 104
Number of pages4
JournalApplied Occupational and Environmental Hygiene
Volume12
Issue number2
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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Welding
Air
Ventilation
Lasers
Guidelines

Keywords

  • welding

Cite this

@article{f555ba1abd1843198c6ea4217ca6ac29,
title = "Air flow field near a welding exhaust hood",
abstract = "Local ventilation is the most important method in the control of welding fumes. The present practice for dimensioning local exhaust is to select capture velocity and then calculate the required air flow, assuming that the contaminant source is located on the hood center-line. Empirical and analytical formulas for these centerline velocities have been derived for simple exhaust hood configurations. However, in more complex cases the velocities may be difficult to estimate. In this study a turbulent air flow field for a flanged welding exhaust hood was calculated numerically using the FLUENT computer code based on the finite volume method. The turbulence model used in the simulation was the standard two-equation κ-ε turbulence model. The accuracy of the calculations was verified by experimental measurements conducted under controlled conditions. The air velocities were measured with a laser-Doppler anemometer, which is a nonintrusive optical measurement method. The results showed that the complex shape of the welding hood has little effect on the air velocities in front of the exhaust hood. The air flow into the unobstructed exhaust hood can be predicted quite accurately provided that the calculation grid and the calculation domain are properly chosen. The results give guidelines for the proper position of the hood relative to the welding point.",
keywords = "welding",
author = "Ilpo Kulmala",
year = "1997",
doi = "10.1080/1047322X.1997.10389468",
language = "English",
volume = "12",
pages = "101 -- 104",
journal = "Journal of Occupational and Environmental Hygiene",
issn = "1545-9624",
publisher = "Taylor & Francis",
number = "2",

}

Air flow field near a welding exhaust hood. / Kulmala, Ilpo.

In: Applied Occupational and Environmental Hygiene, Vol. 12, No. 2, 1997, p. 101 - 104.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Air flow field near a welding exhaust hood

AU - Kulmala, Ilpo

PY - 1997

Y1 - 1997

N2 - Local ventilation is the most important method in the control of welding fumes. The present practice for dimensioning local exhaust is to select capture velocity and then calculate the required air flow, assuming that the contaminant source is located on the hood center-line. Empirical and analytical formulas for these centerline velocities have been derived for simple exhaust hood configurations. However, in more complex cases the velocities may be difficult to estimate. In this study a turbulent air flow field for a flanged welding exhaust hood was calculated numerically using the FLUENT computer code based on the finite volume method. The turbulence model used in the simulation was the standard two-equation κ-ε turbulence model. The accuracy of the calculations was verified by experimental measurements conducted under controlled conditions. The air velocities were measured with a laser-Doppler anemometer, which is a nonintrusive optical measurement method. The results showed that the complex shape of the welding hood has little effect on the air velocities in front of the exhaust hood. The air flow into the unobstructed exhaust hood can be predicted quite accurately provided that the calculation grid and the calculation domain are properly chosen. The results give guidelines for the proper position of the hood relative to the welding point.

AB - Local ventilation is the most important method in the control of welding fumes. The present practice for dimensioning local exhaust is to select capture velocity and then calculate the required air flow, assuming that the contaminant source is located on the hood center-line. Empirical and analytical formulas for these centerline velocities have been derived for simple exhaust hood configurations. However, in more complex cases the velocities may be difficult to estimate. In this study a turbulent air flow field for a flanged welding exhaust hood was calculated numerically using the FLUENT computer code based on the finite volume method. The turbulence model used in the simulation was the standard two-equation κ-ε turbulence model. The accuracy of the calculations was verified by experimental measurements conducted under controlled conditions. The air velocities were measured with a laser-Doppler anemometer, which is a nonintrusive optical measurement method. The results showed that the complex shape of the welding hood has little effect on the air velocities in front of the exhaust hood. The air flow into the unobstructed exhaust hood can be predicted quite accurately provided that the calculation grid and the calculation domain are properly chosen. The results give guidelines for the proper position of the hood relative to the welding point.

KW - welding

U2 - 10.1080/1047322X.1997.10389468

DO - 10.1080/1047322X.1997.10389468

M3 - Article

VL - 12

SP - 101

EP - 104

JO - Journal of Occupational and Environmental Hygiene

JF - Journal of Occupational and Environmental Hygiene

SN - 1545-9624

IS - 2

ER -