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Air curtains are installed in open doorways of a building to reducebuoyancy-driven exchange flows across the doorway. Although an air curtainallows an unhampered passage of humans and vehicles, the interaction of thistraffic with an air curtain is not well understood. We study this problem byconducting small-scale waterbath experiments with fresh water and salt watersolutions. As a model of human passage, a vertical cylinder is pulled through aplanar jet representing an air curtain and separating two zones at differentdensities. For a fixed travel distance of the cylinder before and after the aircurtain, the average infiltration flux of dense fluid in light fluid sideincreases with increasing cylinder velocity. However, we find that theinfiltration flux is independent of density difference across the doorway andthe travel direction of the cylinder. As a consequence, the sealingeffectiveness of an air curtain reduces with an increasing cylinder speed andthis reduction is independent of the direction of the buoyancy-driven flow. Dyevisualisations of the air curtain and the cylinder wake are used to examine there-establishment process of the air curtain after its disruption by thecylinder. We observe that the re-establishment time of the air curtain and theinfiltration in the cylinder wake increases with an increasing cylinder speed.

Contaminant transport by human passage through an air curtain separating two sections of a corridor: Part II -- two zones at different temperatures