Dynamic model for predicting dust-borne odour concentrations in ventilated animal housing

A transfer function technique to describe odor causing VOCs transport in a ventilated airspace with mixing/adsorption heterogeneity

“…A simple criterion to ascertain the validity of this approximation is to show that the product of the deposition rate coefficient and the average residence time is not considerably larger than unity [5]. A theoretical study by Liao et al [5] shows that the ratios between adsorption and deposition rates for two different aerosol profiles of 2 and 8 lm geometric mean diameters in a ventilated airspace have the magnitudes ranged from about 10-10 2 . Thus, a relative comparison with adsorption and ventilation, deposition reflects an insignificant contribution to the transport mechanisms.…”

“…The transport of VOC-odor in a ventilated animal housing, subject to rate limitation of mass transfer between the heterogeneous mixing patterns and the interaction among VOC-odor, ambient aerosol, and adsorbed VOC-odor (or called dust-borne VOC-odor), is increasingly the focus of research in bioenvironmental control engineering [1][2][3][4][5][6].…”

“…1A). The sorption of VOC-odor on airborne dust has been shown to be dominated by the behavior of the interactions among VOC-odor, airborne dust, and dust-borne VOC-odor [5]. The mechanistic function of airborne dust in uptake of VOC-odor may be partitioning and/or adsorption (Fig.…”

Removal Dynamics of Airborne Road Dust in a Ventilated Airspace

“…Friedlander, [15] Liao et al, [21] Greenfield et al, [22] Okuyama and Kousaka, [23] Liao et al [24] and among others have been used the populationbalance model to describe the time-dependent change in properties of an airborne dust undergoing turbulent coagulation, turbulent diffusive deposition, gravitational settling, and ventilation airflow. By using the populationbalance model, the road dust dynamics in a ventilated airspace can be expressed as (Fig.…”

“…Friedlander, [15] Okuyama et al, [16] Rogge et al, [17] Kleeman and Cass, [18] Wang et al, [19] Liao and Singh, [20] Liao et al [21] and among others have been presented the theoretical and experimental studies on this mode of removal. Friedlander [15] pointed out that the general dynamic equation associated with the Navier-Stokes equation can be used to represent dust and airflow distribution, it is extremely difficult, if not impossible, to solve exactly.…”