Abstract
From the observation of axisymmetric water-water jets, it is found that their structure is almost the same as that of gas jets, although the Schmidt number of water is several hundred times as large as that of gases. Therefore, it is concluded that molecular diffusion contributes very little to mass transport in free turbulent jets. The spread of a jet in a cross flow in its symmetric plane is found to be similar to that of an axisymmetric jet, whether the cross flow is a uniform-velocity flow or a shear flow. On this ground, using the empirical relation of axisymmetric jets for jet spread, a method for predicting the shape of an axis of a jet emerging into a cross flow is proposed. Calculated shapes of jet axes in a uniform flow and a uniform shear flow agree well with he experimental results over a wide range of velocity ratios.
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