Axial Flow Conditions Research Articles

Stresses and friction force in moving packed beds

AbstractA model to determine stresses and friction forces in moving packed beds with interstitial fluid flow has been developed. The scaling parameters are determined from the governing equations. A plane and an axisymmetric bed geometry are studied and the wall stress calculated under uniform one‐dimensional axial flow conditions. The effect of added transverse flow (for example, due to a screen in the wall) is investigated. The present model is an improvement over earlier, one‐dimensional models with capability to include in the stress analysis varying pressure gradients in all directions which may exist in practical moving bed systems.

The Performance of Externally Pressurized Bearings Using Simple Orifice Restrictors

The load capacity and vibration characteristics of externally pressurized thrust and journal bearings have been investigated. The bearings used orifices sufficiently recessed back from the bearing surface to ensure that the area of the orifice is the minimum presented to the gas flow. The journal bearings consist of plain cylinders with one or two rows of eight orifices, and the thrust plates of plain discs with six orifices drilled in equispaced circumferential grooves. The load capacity of the thrust plates agrees with that calculated but the vibrations are greater than predicted. The load capacity of journal bearings is about half that calculated assuming axial flow conditions in the bearing, but circumferential flow can account for the difference. Synchronous and half-speed vibrations of a shaft rotating within these bearings have been measured and found to agree with those calculated on the assumption that the gas films behave as linear springs. *Presented as an American Society of Lubrication Engine...