= RMS concentration fluctuation = average concentration = transverse jet orifice diameter = tube diameter = functions = impulse = ratio of transverse to axial momentum = unknown constants (a = 1,2,3) = time after injection = pipe velocity = jet velocity = distance downstream of injection point = density = global vorticity LITERATURE CITED Broadwell, J. E., and R. E. Breidenthal, "A In an earlier paper (Rasmuson and Neretnieks, 1980) an analytical solution of a model for flow and longitudinal dispersion in beds of spherical particles, coupled with diffusion and linear sorption in the particles, was given. The solution is derived for a step inlet concentration and is in the form of an infinite integral:The entities g and h are complicated functions of the variable of integration X and of the following dimensionless parameters: The integrand is oscillatory. Due to the very rapid oscillation of the integrand for certain parameter values, especially for longer times, a straightforward integration will fail. To overcome this difficulty a special integration method was developed. In this method the integration is performed over each half-period of the sine wave separately. The convergence of the alternating series obtained is then accelerated by repeated averaging of the partial sums.For the case where the film resistance is negligible (u = O), the method was utilized in a computer program for the prediction of the migration of radionuclides in fissured rock (Rasmuson and Neretnieks, 1981).The main problem is the calculation of the zeros ofA combination of limiting expressions and Newton-Raphson's iteration is used. The effect of u has now been incorporated into the numerical scheme. Apart from the fact that H I and H z now are different from

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An analytical and experimental study has been made of the turbulent mixing layer in a pressure gradient. Theory predicts the possible existence of equilibrium flows, and this was confirmed experimentally for turbulent shear layers between streams of helium V