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A platform for research: civil engineering, architecture and urbanism
Deposition of Rain in the Built Environment Studied at Droplet Scale: Rain Droplet Impact, Film Forming and Runoff
Water infiltration in buildings is an increasing issue that has intensified as climate change grows: weather conditions (floodings, storms) are progressively more intense and cause a faster deterioration of buildings. This project focuses on the effects of wind-driven rain, studied at droplet scale, in order to evaluate the impact of a droplet on porous media. The observation of impacting droplets with a highspeed camera allows to investigate the fate of the drop in terms of spreading, or in different splashing, bouncing or rolling regimes. The various parameters leading to those types of droplet behavior are compiled in a phase diagram, taking into account the characteristics of both the droplet and the porous surface. Distinct roughness and porosity events are analyzed through several porous materials to simulate a built façade. Moisture transport properties of substrate, angle of attack, impact speed are considered in studying the fate of the drop in relation to the spreading ratio and absorption in the porous media. Comparisons of the theoretical equations with the measurement results are set to understand the mechanism of absorption and water distribution. Understanding and assessing porous surface wetting by a single droplet is essential to upscale the analysis. The effects of a droplet spreading will help to predict the wetting, drying and runoff of rain water in the built environment at urban scale.
Deposition of Rain in the Built Environment Studied at Droplet Scale: Rain Droplet Impact, Film Forming and Runoff
Water infiltration in buildings is an increasing issue that has intensified as climate change grows: weather conditions (floodings, storms) are progressively more intense and cause a faster deterioration of buildings. This project focuses on the effects of wind-driven rain, studied at droplet scale, in order to evaluate the impact of a droplet on porous media. The observation of impacting droplets with a highspeed camera allows to investigate the fate of the drop in terms of spreading, or in different splashing, bouncing or rolling regimes. The various parameters leading to those types of droplet behavior are compiled in a phase diagram, taking into account the characteristics of both the droplet and the porous surface. Distinct roughness and porosity events are analyzed through several porous materials to simulate a built façade. Moisture transport properties of substrate, angle of attack, impact speed are considered in studying the fate of the drop in relation to the spreading ratio and absorption in the porous media. Comparisons of the theoretical equations with the measurement results are set to understand the mechanism of absorption and water distribution. Understanding and assessing porous surface wetting by a single droplet is essential to upscale the analysis. The effects of a droplet spreading will help to predict the wetting, drying and runoff of rain water in the built environment at urban scale.
Deposition of Rain in the Built Environment Studied at Droplet Scale: Rain Droplet Impact, Film Forming and Runoff
Lecture Notes in Civil Engineering
Berardi, Umberto (editor) / Dias, Maude (author) / Derome, Dominique (author)
International Association of Building Physics ; 2024 ; Toronto, ON, Canada
2024-12-14
7 pages
Article/Chapter (Book)
Electronic Resource
English
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