Abstract
We present experimental results demonstrating that, for the turbulent plume from a buoyancy source that is vertically distributed over the full area of a wall, detrainment qualitatively changes the shape of the ambient buoyancy profile that develops in a sealed space. Theoretical models with one-way-entrainment predict stratifications that are qualitatively different from the stratifications measured in experiments. A peeling plume model, where density and vertical velocity vary linearly across the width of the plume, so that plume fluid “peels” off into the ambient at intermediate heights, more accurately captures the shape of the ambient buoyancy profiles measured in experiments than a conventional one-way-entrainment model does.
Highlights
Distributed buoyancy sources, for example, radiators and walls heated by the sun, are commonly found in buildings
We present experimental results demonstrating that, for the turbulent plume from a buoyancy source that is vertically distributed over the full area of a wall, detrainment qualitatively changes the shape of the ambient buoyancy profile that develops in a sealed space
Our experimental results show qualitatively different ambient buoyancy profiles from those predicted by one-way-entrainment models with top hat profiles
Summary
Distributed buoyancy sources, for example, radiators and walls heated by the sun, are commonly found in buildings. Cooper and Hunt [5], Linden et al [10], and Chen et al [4] all consider a ventilated room with a vertically distributed, constant flux source In this case, the plume can reach its neutral buoyancy height at an intermediate height within the room, where it intrudes into the ambient. In experiments with a vertical ice wall as a source, McConnochie and Kerr [11] find that, in the stratified region below the first front, ambient buoyancy profiles are approximately linear They suggest that this disagreement between the profiles from their experiments and the profiles predicted by the models of Cooper and Hunt [5] and Linden et al [10] is due to detrainment.
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