Wave model for longitudinal dispersion: Application to the laminar‐flow tubular reactor
The wave model for longitudinal dispersion, published elsewhere as an alternative to the commonly used dispersed plug-flow model, is applied to the classic case of the laminar-flow tubular reactor. The results are compared in a wide range of situations to predictions by the dispersed plug-flow model as well as to exact numerical calculations with the 2-D model of the reactor and to other available methods. In many practical cases, the solutions of the wave model agree closely with the exact data. The wave model has a much wider region of validity than the dispersed plug-flow model, has a distinct physical background, and is easier to use for reactor calculations. This provides additional support to the theory developed elsewhere. The properties and the applicability of the wave model to situations with rapidly changing concentration fields are discussed. Constraints to be satisfied are established to use the new theory with confidence for arbitrary initial and boundary conditions.
On the construction of dispersion approximations to the solution of the convective diffusion equation
This paper is the sequel to an earlier paper in which we discover how to construct dispersion approximations to the solution of the vector convective diffusion equation. In this paper we make the construction concrete by providing useful formulas for the important elements of our theory. For definiteness we investigate cylinders of circular cross-section.
Rethinking Sexuality Foucault and Classical Antiquity
In this collection of essays, historians and literary theorists assess the influence of Michel Foucault, particularly his "History of Sexuality", on the study of classics. Foucault's work presents a theory of sexuality for both ancient and modern times. These essays should help the reader to explore Foucault's model of Greek culture and see how well his interpretation accounts for the full range of evidence from Greece and Rome.