The interaction of mechanically generated turbulence and interfacial films with a liquid phase controlled gaslliquid transport process

William E. Asher; James F. Pankow

doi:10.3402/tellusb.v38i5.15139

The interaction of mechanically generated turbulence and interfacial films with a liquid phase controlled gaslliquid transport process

Tellus B: Chemical and Physical Meteorology

Volume 38 (1986): Issue 5

By: William E. Asher and James F. Pankow

Open Access

|Jan 1986

Abstract

The liquid phase rate-controlled transport of C02 across a gas/liquid interface into water was studied using a non-invasive laser-induced fluorescence (LIF) technique. Turbulence in the liquid layer was generated by a vertically-oscillating grid. The CO₂/water interface was cleaned by removal of surface water with additive-free lens paper, or 100% rayon cloth followed by surface vacuuming with a glass Pasteur pipette. The liquid phase mass transfer coefficient k_L was measured under conditions of varying turbulence intensity and scale for each surface cleaning procedure. Transport rates were also measured for an uncleaned surface and in the presence of a deliberately created organic monolayer. All of the results were used to test the surface renewal models of Fortescue and Pearson and Lamont and Scott. A model for wind-dominated gasiliquid transfer developed by Cohen was used to relate the present data to k_L measurements for gas exchange in wind tunnels. This comparison indicates that wind tunnel results may be related to stirred-tank experiments using the turbulent dissipation rate ε, and a surface renewal model.

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