Particle deposition from turbulent flows in large tubes (up to 102 mm)
was measured experimentally and a correlation developed for the resul
ts. The correlation allows prediction of the nondimensional deposition
velocity as a function of the nondimensional relaxation time and the
flow Reynolds number. The correlation shows good agreement with previo
us correlations for deposition in small diameter tubes as well for the
full range of tube sizes (13-102 mm diameter) and Reynolds numbers (u
p to 55,000) upon which the correlation is based. As an example of the
improvement in predictive abilities rendered by this new model, the p
enetration of 20-mm-aerodynamic-diameter aerosol particles in a 102-mm
-diameter tube at a flow rate of 2260 L/min was measured to be 59%. Th
e present model predicts a penetration of 62%, while twee previously r
eported models that do not include Reynolds number effects predict 80%
and 82% penetration. This new model should be of benefit in the desig
n and evaluation of large-sized transport tubes for continuous monitor
ing applications.