Particle samplers are widely used in workplaces in order to determine the concentration of airborne particles in the atmosphere. They generally operate by drawing air, with the aid of a pump, through one or more orifices in the sampler body and housed within the sampler is a filter through which the air is subsequently drawn. The airborne particles are collected on the filter and their concentration is determined. Various samplers have been designed for this purpose including "static" samplers, which are located in a fixed position in a working environment and determine the dust concentration averaged over a prescribed period of time at that one point, and "personal" samplers which are mounted on a working person near to the breathing zone. The ORB sampler, a static sampler designed by Ogden and Birkett (1978) to have approximately the same entry efficiency, for particles with aerodynamical diameter up to at least 25~m, as a human head equally exposed to all wind directions for wind speeds between 0 and 2. 75m1s, is shown in Fig. l. l and examples of personal samplers are shown in Fig. 1. 2a, b and c and represent a single 4mm hole sampler, a seven hole sampler and a 25mm open face filter holder respectively. These three samplers are some of the most commonly used personal samplers for sampling the total airborne concentrations of workplace dusts in Britain.
Author(s): Sarah Jane Dunnett, Derek Binns Ingham (auth.)
Series: Lecture Notes in Engineering 38
Edition: 1
Publisher: Springer-Verlag Berlin Heidelberg
Year: 1988
Language: English
Pages: 231
Tags: Waste Management/Waste Technology;Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution;Atmospheric Protection/Air Quality Control/Air Pollution;Soil Science &Conservation;Noise Control;Appl.Ma
Front Matter....Pages I-VIII
General Introduction....Pages 1-10
A Review of Past Work on Particle Sampling....Pages 11-46
A Comparison of Analytically Derived Expressions in Blunt Body Sampling with those Obtained Empirically....Pages 47-65
A Boundary Integral Equation Analysis of Blunt Body Sampling in Two Dimensions....Pages 67-87
Mathematical Investigation of the Sampling Efficiency of a Two-Dimensional Blunt Sampler....Pages 89-99
The Effects of the Particle Reynolds Number on the Aspiration of Particles Into a Blunt Sampler....Pages 101-115
The Aspiration of Non-Spherical Particles Into a Bulky Sampling Head....Pages 117-137
An Empirical Model for the Aspiration Efficiencies of Blunt Aerosol Samplers Orientated at an Angle to the Oncoming Flow....Pages 139-162
Use of the Boundary Element Method for Modelling Three-Dimensional Samplers....Pages 163-186
The Human Head as a Blunt Aerosol Sampler....Pages 187-215
Conclusions....Pages 217-222
Back Matter....Pages 223-232