ON THE DISPERSED TWO-PHASE FLOW IN THE LAMINAR FLOW REGIME.
Abstract:
The time-dependent, dispersed, two-phase flow problem for the laminar flow regime is formulated. In agreement with Burgers description of the flow, the analysis takes into account the effect of both the motion and the presence of other particles. The steady-state solution of the governing set of equations is applied to an analysis of sedimentation and of fluidization batch, cocurrent and countercurrent. Good agreement with experimental data is shown. The steady-state results give a formulation and a confirmation of the basic premise in the theory of Elgin and Lapidus for vertical two phase flow systems. The theory of kinematic waves proposed by Kynch and by Lighthill and Whitham is used to analyze the transient response, i.e., the diffusion process, and to predict the diffusivity in two-phase flow. The kinematic wave theory is used also to predict the operating limits imposed on the system by the flooding phenomenon. Author