A fundamental account of unsteady motion in a dense suspension is the study of phase interactions and origins of the wavy stratified motion. The analysis of wave motions of gas-solid stratified pipe flows is analogous to that of gas-liquid flow with a free surface. Typical flow stratification in gas-solid pipe flows involves a layer of the dense phase of solids flowing near the wall of a vertical pipe with wave motions, or a dense phase of solids flowing along the bottom of a horizontal pipe with wave motions. The latter was analyzed, in part, based on the theoretical work of de Crecy (1986) on stratified liquid-vapor flows. In this study, a regionally averaged modeling of two-phase two-region one-dimensional gas-solid straitified flow is developed. The applications of this modeling is exemplified by the cases of vertical flows in cylindrical columns. As s result of the analysis, a general nature of wave motion of the flow 'is revealed, which yields equations governing the characteristic wave speed of the motion. In addition, nine independent constitutive relations are obtained, which assists the closure of the problem.
|Original language||English (US)|
|Number of pages||8|
|Journal||American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED|
|State||Published - Dec 1 1996|
All Science Journal Classification (ASJC) codes