Adiabatic interaction of particles with a compressible flow: Basic mechanics

The final state of the interaction of a compressible Row with a spray or so lid particle dispersion in a constant-area straight duct is analyzed using fluid mechanics in a control-volume approach. The variations of the flow Ma ch number at low values of the liquid volume fraction are calculated for ad iabatic interaction between the gas flow and the particles. The Row can be choked by effect of the particles in a way analogous to that of heat additi on or wall friction, although isentropic interactions leading to a change f rom subsonic to supersonic flow are also possible. The final flow condition depends on the initial velocity of the particles and the particle flow rat e. The effects of downstream pressure changes are discussed. The interactio n can also be represented in a temperature-entropy diagram, yielding lines similar to those obtained in cases with heat addition or wall friction.