Abstract
Deposition loss of particles in air sampling conduit causes the error in estimation of aersol concentration in air. This paper describes the calculation on deposition loss in a straight conduit caused by the gravitational settling and the thermal diffusion in laminar flow and the eddy diffusion in turbulent flow and discusses air flow rates in a conduit for minimizing the deposition loss.The calculation using a computer was made based on the semiempirical equations for the deposition loss formulated by other authors. The results show that the deposition loss for particles of 1g/cm3 density and 1μ diameter in a conduit of 2cm diameter and 10, 000cm long is within 10% in the flow rate of 40 to 400l/min (Reynolds number 3, 000-30, 000).
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