摘要：The mesoscale structures such as clusters and bubbles have a significant impact on the flow, transfer, and reaction process of heterogeneous gas-solid systems. This article proposes a structural two-fluid model for simulating the hydrodynamics and heat transfer in a complex gas-solid system. Based on the different flow control mechanisms, the bubbling fluidized bed system is treated as two interpenetrating fluids that are the fluids of gas-dominated bubble phase and the particle-dominated emulsion phase. With this fundamental idea, we establish the governing equations and constitutive relationships considering the influence of mesoscale structure. Reasonable empirical correlations are utilized to close the interphase drag force, the emulsion phase viscosity, the interphase heat transfer coefficient, and the thermal conductivity of each fluid. Present structural two-fluid model in conjunction with an explicit resolution of hydrodynamic and thermal boundary layer is employed to simulate a bubbling fluidized bed system with a vertical heating tube. The simulation results demonstrate that the structural two-fluid model accurately predicts the axial distribution of solid holdup as well as the bed-to-wall heat transfer coefficient, specifically, the relative error between the simulated and experimental values of the wall heat transfer coefficient in the dense phase regime is less than 10%, and the simulated wall heat transfer coefficient in the dilute phase regime is in the same order of magnitude as the experimental value. It shows that the structural two-fluid heat transfer model can accurately describe the flow heat transfer characteristics of the gas-solid two-phase in the bubbling bed system. 漏 2024 Materials China. All rights reserved.

ISSN号：0438-1157

卷、期、页：卷75期4：1497-1507

发表日期：2024-04-25

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：化工学报

参与作者：Lan, Bin,Luo, Jiewen

通讯作者：赵金鹏

第一作者：张永民,赵碧丹,王军武

论文类型：期刊论文

论文概要：赵金鹏,张永民,Lan, Bin,Luo, Jiewen,赵碧丹,王军武，Model development and validation of structural two-fluid model for heat transfer in a gas-solid bubbling fluidized bed，化工学报，2024，卷75期4：1497-1507

论文题目：Model development and validation of structural two-fluid model for heat transfer in a gas-solid bubbling fluidized bed