Computational fluid dynamics (CFD) has become a widely used tool for analysing, optimising and supporting the design of mixing processes in stirred vessels. The present contribution gives a brief summary of the methods applied for numerically treating the power input by the impeller, such as empirical methods, the multiple frame of reference approach and unsteady methods using sliding or clicking meshes. Thereafter, recent developments and trends in the numerical computation of single phase flows in stirred vessels on the basis of DNS (direct numerical simulations), LES (large eddy simulations) and RANS (Reynolds-averaged Navier-Stokes) approaches are summarised. Since many operations in stirred vessels involve at least two phases, also the methods for modelling these flows, such as the two-fluid method and the Euler/Lagrange approach are briefly described and recent applications are reviewed. Finally, also own calculations for single-phase mixing and particle dispersion in a stirred vessel using the Euler/Lagrange approach are introduced emphasising some recent developments.

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Its principal goal was to use detailed case studies to explore the relevance of interest group approaches to the stud}' of Chinese politics. The second, a panel organized by the editor for the 1978 Chicago meeting of the Association of Asian Studies, sought to apply participatory approaches to the role of social groups in the Chinese political process. The striking degree of overlap in the focus, methodology, and participants in both meetings suggested to a number of the paper writers that there was a need for a more eclectic approach which would focus simultaneously on individual and group actors. The recognition that a volume based on such an approach might serve the needs of students and scholars seeking to examine the dynamics of informal influence and power in China was the stimulus for publishing the studies presented here in book form.Three of the chapters in the current volume were originally drafts prepared for the 1977 workshop; two were initially presented at the 1978 meeting in Chicago. Three other chapters were commissioned later as the volume took shape through our correspondence and meetings of 1980 and 1981. All have been revised to take account of the dramatic revelations of the post-Mao years.

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