Abstract
Abstract A simple model is proposed for estimating the mass entrainment into two-dimensional (2D) free plumes. The model rests on the assumption that the entrainment into the curved section of a spilling plume is approximately equal to the entrainment into a vertical free plume rising through the same height. The model is shown to be in good agreement with measurements in several small-scale models. The measured entrainment coefficient for the 2D plumes in the scale model studies, which had been determined from measurements of entrainment into the vertical portion of those plumes, was found to be around C m =0·44, slightly below recently proposed values for unbounded 2D plumes. It is suggested that the observed deviations from the proposed model of measurements in two small-scale models of atria might have been caused by the relatively small size or shape of those atria.
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