The effectiveness of the uniform density, two-dimensional wall jet

The paper presents new measurements of the effectiveness of a two-dimensional wall jet and a calculation procedure which is shown to closely predict the measured values for a restricted, but practically important, class of injection conditions. The measurements were performed in the range of slot to free stream mass velocity from 0·467 to 2·26, using helium as a tracer gas and gas chromatographic equipment to detect the relevant concentrations. The prediction method uses empirical correlations to relate the flow properties at the slot to those downstream of the potential core. Thereafter, an explicit method of solving the boundary-layer equations is employed. The advantages and disadvantages of the method are discussed.