Author(s): B. S. Pani; N. Rajaratnam

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Abstract: An experimental study of swirling circular wall jets, with the swirl number equal to 0.141 and 0.265, has shown that the axial velocity profiles in the center plane are similar and are well described by the curve of the simple plane wall jet. The axial velocity distribution in the transverse direction (parallel to the wall) is also similar (in the neighbourhood of the wall) and is well described by the Goertler-type solution for the circular jet. The velocity scale decreases inversely with the axial distance whereas the length scales grow linearly with the axial distance. The effect of swirl is to make the velocity scale decay faster and it also makes the jet spread more rapidly in the transverse direction. The swirl also reduces the centerline bed shear stress effectively. The distribution of the bed shear stress in the transverse direction has been found to be similar.

DOI: https://doi.org/10.1080/00221687609499678

Year: 1976