Abstract
Measurements of the terminal velocity, the frequency of oscillation and the eccentricity are presented for drops of purified dichloroethane falling through water contaminated with known amounts of sodium lauryl sulphate. Details are also given of the structure and size of the attached wake. The results are compared with the results obtained for solid spheres falling through water and also with the correlations obtained by other workers for systems which had not been carefully purified. At low concentrations of sodium lauryl sulphate (viz 10 −5 g/l.) the results were consistent with the results obtained in the absence of sodium lauryl sulphate. When the system was contaminated grossly but to different degrees (viz 10 −2 and 10 −1 g/l.) the results were again consistent but differed from the results obtained for the purified system. Previous correlations, obtained for systems which had not been carefully purified, agreed with the results for the grossly contaminated system.
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