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The mass accommodation coefficient of ammonia on water

Authors:

A Bongartz S Schweighoefer C Roose U Schurath

Institution:

1. Institut für Physikalische und Theoretische Chemie, Universit?t Bonn, Wegelerstr. 12, D-53115, Bonn, Germany

Abstract:

The mass accommodation coefficient gamma

of ammonia gas on water has been determined by measuring the absorption rate of 50–200 ppm NH₃ in one atm of air or helium into a liquid jet of 97 µm diameter as function of the exposed jet length, and comparing the results with numerical simulations which treat gamma

as the only free parameter. The model considers in detail transport of NH₃ by molecular diffusion, penetration of the gas/water interface, hydrolysis in the acidified water, and transport of the solutes from the surface into the jet. A correction is applied for the time evolution of the jet surface speed, using literature data on the fluid mechanics of liquid jets. The result of nine sets of independent measurements is

$\gamma NH_3 = 0.04_{ - 0.005 \cdot }^{ + 0.03}$

Keywords:	Ammonia mass accommodation coefficient liquid jet evaporative cooling interfacial resistance
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