Experimental results on the dispersion of buoyant gas in a full scale garage from a complex source

Dispersion and burning behavior of hydrogen released in a full-scale residential garage in the presence and absence of conventional automobiles

“…When vehicles were placed over the hydrogen release location, the mixing was more complete, and vertical concentration gradients were virtually eliminated. The latter finding is consistent with the results of Cariteau et al, who found nearly uniform vertical concentration profiles when helium was released under a small commercial vehicle parked in a single-car garage [8].…”

“…The built-up hydrogen was ignited, and the authors concluded that the resulting burning did not pose a significant danger to people in the immediate vicinity of the vehicle. Cariteau et al measured the time and spatial distributions of helium released at three different locations under the hood, engine, and passenger compartment of a small van parked in a one-car garage [8]. Measurements were compared with similar releases without a vehicle present.…”

Numerical study on the influence of different boundary conditions on the efficiency of hydrogen recombiners inside a car garage

“…In order to assess the impact of the hydrogen distribution, the same arrangement has been repeated for hydrogen release from below a generic car mock-up leading to a more homogeneous hydrogen distribution (M11eM13, M18). These different hydrogen distribution characteristics are in agreement with experimental findings reported by Cariteau et al [13] and Pitts et al [15].…”

“…However, a diffuse hydrogen release e.g. from underneath a car would lead to a more homogeneous distribution [13,15]. This case has been investigated by introducing an obstacle in the shape of a car to the numerical domain.…”

Natural and forced ventilation of buoyant gas released in a full-scale garage: Comparison of model predictions and experimental data

“…On the other hand, when momentum forces dominate or when the flow is obstructed, the buoyant gas can get well-mixed with the surrounding air [12]. Turbulent mixing under the vehicle and the release of the buoyant gas as multiple plumes in and around the vehicle has been observed and reported in experiments [10]. The role of clutter in the garage on the flow field, and the transition from a stratified flow field to a fully mixed flow field has not been investigated adequately in the literature.…”