Abstract
Liquid nitrogen is helping researchers at Calspan make sufficiently steep temperature gradients to produce realistic inversions over modeled cities in their Atmospheric Simulation Facility (ASF). ASF is a 36‐meter‐long wind tunnel with a 2‐ meter‐wide turntable where a scale model of the area and buildings to be studied can be installed. The tunnel is capable of creating wind speeds from less than 1.6 to about 96 km/hour.In recent studies for the U.S. Environmental Protection Agency, Calspan modeled a large industrial area of about 110 km2 around Pittsburgh to study the dispersion of effluents from 49 model stacks of steel mills and power plants near the Monongahela River.
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