A Macroscopic Model for Predicting Dust Concentration Distribution in Swine Buildings

Abstract

A macroscopic model for predicting dust concentration distribution in mechanically ventilated swine rooms has been developed. The model accounts for the effect of turbulent diffusive deposition, gravitational settling, coagulation and ventilation. Four particle diameter size ranges were chosen to represent the fine particles in swine buildings: 0.5–0.9, 0.9–1.6, 1.6–2.8, and 2.8–5.0 µm. Predicted results indicated that ventilation would be the dominant particle removal mechanism accounting for over 90% of the particles removed; that deposition of particles on surfaces would be small (2–9%), and loss by coagulation negligible (≈0%). Additionally, source location would strongly influence the dust concentration distribution in the prototype swine room. Dust generation rate and presence or absence of obstructions in the form of mock pigs would affect the dust distribution minimally. Temperature difference between supply and room air (7–9 vs. 14–16°C) would not cause any appreciable difference in dust distribution.