Implementation of Two-Fluid Model for Dilute Gas-Solid Flow in Pipes With Rough Walls

作者：Zaman Ashraf Uz^*; Bergstrom Donald John

来源：Journal of Fluids Engineering-Transactions of the ASME, 2014, 136(3): 031301.

DOI：10.1115/1.4026282

• two-layer model
• gas-solid flow
• two-fluid model
• turbulence modulation
• surface roughness

A numerical study was carried out to investigate the performance of a two-layer model for predicting turbulent gas-particle flows in rough pipes. An Eulerian-Eulerian two-fluid formulation was used to model both the gas and solid phases for turbulent gas-particle flow in a vertical tube. The stresses developed in the particle phase were calculated using the kinetic theory of granular flows while the gas-phase stresses were described using an eddy viscosity model. The two-fluid model typically uses a two-equation k - epsilon model to describe the gas phase turbulence, which includes the suppression and enhancement effects due to the presence of particles. For comparison, a two-layer model was also implemented since it has the capability to include surface roughness. The current study examines the predictions of the two-layer model for both clear gas and gas-solid flows in comparison to the results of a conventional low Reynolds number model. The paper specifically documents the effects of surface roughness on the turbulence kinetic energy and granular temperature for gas-particle flow in both smooth and rough pipes.

• 出版日期2014-3
• 单位Saskatoon; Saskatchewan