In recent years, displacement ventilation system has received much attention in terms of infectious disease control, due to the epidemic COVID-19 infections. Plume from occupants and other heat sources is a very important factor for because it determines height contaminant stratification. Therefore, this paper aims at effect distance between on distribution temperature, concentration plume CFD ...

Advection flow is a dominating physical mechanism of contaminant transport over geologic fractured media. Natural fractures often combine into percolation cluster, having fractal properties. As a result long-ranged correlations arise in the fluctuating velocity field of infiltration flux. The presence of preferred direction due to the gravity force leads to the strong anisotropy of the advectio...

Contaminant transport in subsurface water is the major pathway for contamination spread from contaminated sites to groundwater supplies, to remediate a contaminated site. The aim of this paper was to set up the groundwater contaminant transport model for the Wang-Tien landfill site, in southwestern Taiwan, which exhibits high contamination of soil and groundwater and therefore represents a pote...

Air sparging (AS) is a commonly applied method for treating groundwater contaminated with volatile organic compounds (VOCs). When using a constant injection of air (continuous mode), a decline in remediation efficiency is often observed, resulting from insufficient mixing of contaminants at the pore scale. It is well known that turning the injection on and off (pulsed mode) may lead to a better...

Following a toxic contaminant release, either accidental or intentional, predicting the transport and dispersion of the contaminant becomes a critical problem for Homeland Defense and DoD agencies. To produce accurate predictions requires characterizing both the source of hazardous material and the local meteorological conditions. Decision makers use information on contaminant source location a...

Models can be powerful tools to aid interpretation of data and for prediction of the fate of contaminants, as in the case of petroleum hydrocarbons in groundwater environments. Here we describe the transport processes that can be more or less dominant at different stages in the ‘life’ of a petroleum contaminant spill in groundwater, such as advection, dispersion, dissolution from free-phase non...

The present paper deals with the numerical study of horizontal laminar flow ventilation system for surgical site in hospital. When the orientation of supplies openings and exhausts are altered, the performance of ventilation system in terms of effectiveness of removal of contaminated particles is also affected. In this investigation, the performance of new horizontal Single Sided Supply and Exh...

Sedimentological processes often result in complex three-dimensional subsurface heterogeneity of hydrogeological parameter values. Variogram-based stochastic approaches are often not able to describe heterogeneity in such complex geological environments. This work shows how multiple-point geostatistics can be applied in a realistic hydrogeological application to determine the impact of complex ...

The objective of this research is to determine the relationship between of biologically active contaminant degradation zones in a fractured, subsurface medium and vertical geological heterogeneities. The research is being performed on samples collected from the Test Area North (TAN) site at the Idaho National Engineering and Environmental Laboratory (INEEL) where a dissolved trichloroethylene (...

Anomalous dispersion is observed throughout hydrology, yielding a contaminant plume with heavy leading tails. The fractional advection dispersion equation (FADE) captures this behavior by replacing the second-order spatial derivative with a Riemann-Liouville (RL) fractional derivative. The RL fractional derivative is a nonlocal operator and models large jumps of solute particles in heterogeneou...