Similarity solutions for unsteady shear-stress-driven flow of Newtonian and power-law fluids : slender rivulets and dry patches

Unsteady flow of a thin film of a Newtonian fluid or a non-Newtonian power-law fluid with power-law index N driven by a constant shear stress applied at the free surface, on a plane inclined at an angle α to the horizontal, is considered. Unsteady similarity solutions representing flow of slender rivulets and flow around slender dry patches are obtained. Specifically, solutions are obtained for converging sessile rivulets (0 < α < π/2) and converging dry patches in a pendent film (π/2 < α < π), as well as for diverging pendent rivulets and diverging dry patches in a sessile film. These solutions predict that at any time t, the rivulet and dry patch widen or narrow according to |x|3/2, and the film thickens or thins according to |x|, where x denotes distance down the plane, and that at any station x, the rivulet and dry patch widen or narrow like |t|−1, and the film thickens or thins like |t|−1, independent of N

Review of Politiques publiques. 1, la France dans la gouvernance européenne, edited by Olivier Borraz and Virginie Guiraudon

An ambitious new book, Politiques publiques. 1, La France dans la gouvernance européenne, edited by Olivier Borraz and Virginie Guiraudon, offers an empirically rich and theoretically reflective response to questions concerning the impact on national policymaking and administration of growing inter-state cooperation, the sharing of decisional authority within the European Union and the delegation of regulatory responsibilities to semi-autonomous agencies at home. It investigates where, with internationalisation and Europeanisation, policy is made and by whom, who decides and to whom they are accountable, and what has become of the French model. Avoiding the dogmatism that characterises debates about globalisation and Europeanisation, the book provides a detailed, well-informed and accessible overview of policy and policy-making in a large and singular EU member state