Applied Scientific Research Contents of Volume 50 (1993) Vol.50 No.1 January 1993 Publisher’s announcement M. Bouthier: Vorticity in plane parallel, axially symmetrical or spherical flows of viscous fluid A. Nakayama, F. Kuwahara and H. Koyama: Transient non-Darcy free convection between parallel vertical plates in a fluid-saturated porous medium M. Mani, S.N. Tiwari and J.P. Drummond: Investigation of chemically reacting and radiating supersonic fiow in channels G. Rehbinder: Damped pitching of a slender body partially immersed in a liquid A. Nakayama and A.V. Shenoy: Combined forced and free convection heat transfer in power-law fluid-saturated porous media Vol.50 No.2 March 1993 G. Pétré, M.A. Azouni and K. Tshinyama: Marangoni convection at alcohol aqueous solutions—air interfaces F.A. Mohamed: The energy-integral method: application to linear hyperbolic heat-conduction problems N. Hatta, H. Fujimoto and H. Takuda: Numerical analysis of flow pattern of impinging liquid sprays in a cold model for cooling a hot flat plate S.M. Sami and J. Schnotale: Prediction of forced convective condensa- tion of non-azeotropic refrigerant mixtures inside enhanced surface tubing J.B.W. Kok: Collision dynamics of bubble pairs moving through a perfect liquid Vol.50 Nos. 3-4 May 1993 Special Double Issue Further Developments in Turbulence Management Guest Editor: K. Krishna Prasad Preface S. Tardu, T.V. Truong and B. Tanguay: Bursting and structure of the turbulence in an internal flow manipulated by riblets Y.P. Tang and D.G. Clark: On near-wall turbulence generating events in a turbulent boundary layer on a riblet surface A.D. Schwarz-van Manen, A.F.M. van Geloven, J. Nieuwenhuizen, J.C. Stouthart, K. Krishna Prasad and F.T.M. Nieuwstadt: Friction velocity and virtual origin estimates for mean velocity profiles above smooth and triangular riblet surfaces P. Luchini: Viscous sublayer analysis of riblets and wire arrays L. Djenidi and R.A. Antonia: Riblet flow calculation with a low Reynolds number k-e model B.E. Launder and S.P. Li: On the prediction of riblet performance with engineering turbulence models S. Tullis and A. Pollard: Modelling the time-dependent flow over riblets in the viscous wall region K.S. Choi and N. Fujisawa: Possibility of drag reduction using d-type roughness E. Savory, N. Toy, P.J. Disimile and R.G. DiMicco: The drag of three- dimensional rectangular cavities H.-W. Bewersdorff and H. Thiel: Turbulence structure of dilute polymer and surfactant solutions in artificially roughened pipes A. Hamdouni and J.P. Bonnet: Effect of external manipulators on the heat transfer on a flat plate turbulent boundary layer