An empirical study on the wake around a squatting worker in a confined space

Journal of Occupational Health
Jun Ojima

Abstract

When an air current flows from behind a worker, the contaminant level in the breathing zone may increase due to the wake around the worker. Researchers have been investigating about this wake, and much knowledge has been provided about the wake that appears around a standing worker. However, the wake around a squatting worker has not been addressed. This study aimed to describe the wake in front of a worker squatting in a confined space by using a model worker and a chamber and investigate the conditions in which this wake develops easily. A mannequin was employed as a model worker and was placed in the chamber to simulate a squatting worker in a confined space. Then, air was sent from behind under various conditions with a fan, and the wake was observed. A wake appeared when smoke was emitted at 0-0.1 m from the point just below the breathing zone, and most of the wake region was in the range between the point just below the model worker's breathing zone and body. A wake did not appear when a fan of 0.15 m in diameter was used. The flow rate and velocity of the airflow were almost irrelevant with respect to wake development. The following are recommended based on the results of the present study. i) The distance between a sour...Continue Reading

References

May 1, 1996·American Industrial Hygiene Association Journal·M R FlynnP Muthedath
Oct 1, 1996·The Annals of Occupational Hygiene·I KulmalaS Enbom
Feb 1, 1996·The Annals of Occupational Hygiene·A E JohnsonC J Saunders
Apr 25, 2000·The Annals of Occupational Hygiene·I WellingR Niemelä
May 24, 2008·The Annals of Occupational Hygiene·Darrah K SchmeesJames H Vincent
Jul 16, 2011·Sangyō eiseigaku zasshi = Journal of occupational health·Jun Ojima
Jul 14, 2012·Industrial Health·Jun Ojima
May 24, 2013·Journal of Occupational and Environmental Hygiene·Ertan KaraismailSteven E Guffey

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Citations

Mar 25, 2015·Clinical Chemistry and Laboratory Medicine : CCLM·Irene PuscedduMarkus Herrmann

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