TY - GEN
T1 - Heterogeneous flow structure in gas-solid risers
T2 - 2008 AIChE Annual Meeting, AIChE 100
AU - Wang, Dawei
AU - You, Jun
AU - Zhu, Chao
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:79952287558
SN - 9780816910502
T3 - AIChE Annual Meeting, Conference Proceedings
BT - AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings
Y2 - 16 November 2008 through 21 November 2008
ER -