Dusty Gas Flow in a Converging-Diverging Nozzle

Abstract

The flow in a converging-diverging nozzle is studied numerically. The flowing medium is a suspension composed of gas seeded with small, spherical, solid particles. The solution covers the entire flow history, from its initiation and until a steady state flow is reached. The covered flow domain includes both the flow field inside the nozzle and part of the free jet flow outside of the nozzle exit plane. The solution is repeated for different solid particle diameters, ranging from 0.5 μm to 50 μm, and different dust loading ratios. It is shown that the presence of solid particles in the flow has a significant effect on the developed flow field, inside and outside the nozzle. In particular, by a proper choice of particles diameter lateral pressure waves and the secondary shock wave can be significantly attenuated. The solid particles size has also a marked effect on the position and size of the Mach disk appearing in the free jet flow. It is also shown that in a suspension case a steady state flow is reached faster than in a similar pure gas flow.

Computation of unsteady generalized Couette flow and heat transfer in immiscible dusty and non‐dusty fluids with viscous heating and wall suction effects using a modified cubic B‐spine differential quadrature method

“…These flows generally feature a homogenous liquid (velocity phase) carrying small dust particles (solid phase) and are also an example of a two-phase system. They arise in aerodynamics, 1 chemical engineering fluidized beds, 2 spinning bioreactors, 3 liquid metal processing, 4 nozzle systems in propulsion, 5 cosmical hydrodynamics, 6 and solid oxide fuel cells (SOFCs). 7 Early work on modeling dusty fluids for the Newtonian case was reported by Saffman 8 who proposed a dusty fluid framework taking into consideration the impact of suspended particles on laminar flow stability.…”

The Geometric Conservation Based Algorithms For Multi-Fluid Flow At All Speeds

“…Several researchers have analyzed the problem and data is available for comparison [83][84][85][86][87][88][89][90][91][92]. In most of the reported studies, a shorter diverging section, in comparison with the one considered here, has been used when predicting the two-fluid flow.…”