Aeration mass‐transfer related to reynolds number

Abstract A study of aeration rate data for streams and laboratory channels shows that the aeration rate can be correlated with Reynolds number and Schmidt number by a suitable dimensionless mass‐transfer parameter which varies only slowly over a wide range of Reynolds number. This parameter, analogue to similar correlations in the heat‐ and mass‐transfer fields, has two different near‐constant levels, one in the low Reynolds number regime corresponding to molecular diffusivity, and another in the high Reynolds number regime corresponding to eddy diffusivity. The Schmidt number dependence has been found by comparison of gas into water data with vapour into gas data.