New light on mechanism of air-water oxygen exchange in quiescent systems |
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Authors: | TJ Casey PE O'Connor |
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Affiliation: | Water and Effluents Laboratory, Engineering School, University College, Upper Merrion Street, Dublin 2, Ireland |
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Abstract: | Experiments employing novel apparatus which permits measurement of the rate of oxygen transport across liquid strata indicate that the diffusivity of oxygen through water immediately adjacent to the free air-water interface of a quiescent system is the same as its molecular diffusivity in bulk water remote from an interface. A molecular diffusivity of 2.07 × 10−5cm2s−1 is reported. Water strata of thickness ranging from 0.3 to 3.6 mm are shown to be effectively isotropic with respect to their resistance to oxygen transport. Thicker strata were found to exhibit a reduced but significant resistance consistent with the spontaneous development of a mechanically disturbed bulk zone between the boundary layers. |
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