Gas-solid Flow System Research Articles

Thermodynamic approach to qualitative properties of trajectories of heat and mass transfer in gas-solid flow systems—II. Reacting systems

This article represents the second part of the work originated in [1]. Study is made of qualitative properties and stability of trajectories of simultaneous heat and mass transfer in reacting flow systems. For systems where the singular point is of quasi-equilibrium type the thermodynamic Liapunov function, V, resulting from the entropy balance, is an efficient stability (or instability) criterion. Whereas in the case of stationary non-equilibrium singular point a generalized function V s , defined as the sum of V and some “kinetic” term, is suitable for predicting the qualitative properties and stability of trajectories.

Thermodynamic approach to qualitative properties of trajectories of heat and mass transfer in gas-solid flow systems—I. Nonreacting systems

Study is made of qualitative properties and stability of trajectories of simultaneous heat- and mass-transfer processes in gas-solid flow systems. Liapunov functions based on the thermodynamic principle are constructed, and instability of trajectories of counter flow processes is thermodynamically grounded. Emphasis is made on a general character of the above thermodynamic approach to the stability and qualitative properties of trajectories.

Concepts of Multiphase Flow Related to the Jenike Design Method

Hypotheses are presented here for improving bulk solids flowability. They are directed toward a quantitative design goal for gas-solids flow systems. An effort is made to relate gas control in gas-solids flow systems to the Jenike design method. Cohesion and friction in slumped beds are frequent barriers to flow. Gas or liquid moving through bulk solids interstices can reduce interparticle cohesion. Changes in interstitial fluid pressure can modify friction angles and so change channel flow factors and bulk solid flow functions. Mass flow can be achieved in gas-solids flow systems using comparatively large hopper half apex angles.