Heterogeneous flow structure in gas-solid risers: Continuous modeling

Dawei Wang, Jun You, Chao Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Gas-solid riser flow exhibits strong heterogeneous structure in both axial direction and radial directions. Recent experimental studies reveal that the general radial solids concentration profiles present a double ring structure and the formation of a solid core region which have a relative higher concentration than the annulus region. This paper is focused on a comprehensive modeling of continuous gas-solids flow structure both in radial and axial directions. The specific transport mechanism due to collisional diffusive mass transfer and turbulent mass transfer are modeled. The radial heterogeneous flow structure of solids and gas at the different stage of the riser are investigated in detail. This mechanistic model, implemented with a detailed axial flow structure model, consists of a set of coupled ordinary-differential equations developed from conservation laws of mass, momentum and kinetic energy of both gas and solids phases. The solving algorithm is based on the Runge-Kutta method. The proposed model predicts the phase transport profiles such as the solids concentration, phase velocities and pressure drops in different regions along the riser. The model also yields the critical information of flow structure characteristics such as back flow, wall frictions and choking.

Original languageEnglish (US)
Title of host publicationAIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2008
Event2008 AIChE Annual Meeting, AIChE 100 - Philadelphia, PA, United States
Duration: Nov 16 2008Nov 21 2008

Publication series

NameAIChE Annual Meeting, Conference Proceedings

Other

Other2008 AIChE Annual Meeting, AIChE 100
CountryUnited States
CityPhiladelphia, PA
Period11/16/0811/21/08

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

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