Downward two-phase (Gas - Solid) Turbulent Flow Through a Vertical Sudden Expansion Duct with a Backward-Facing Step

Document Type : Original Article


1 Department of Basic Engineering Science, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt

2 Basic Engineering Science Department, Faculty of Engineering, Menoufia University , Egypt

3 Basic Engineering Sciences Department, Engineering Faculty, Menoufia University

4 Department of Mechanical Power Engineering, Faculty of Engineering, Menoufia University


This study aims to investigate the impact of particles on flow characteristics within the framework of downward turbulent gas-solid flow through a sudden expansion backward-facing step. Employing the Eulerian-Lagrangian approach, the simulation encompasses both gas and solid phases. A custom FORTRAN code, based on the finite volume technique with a hybrid scheme in a staggered grid, is developed to simulate the scenario. This research introduces and compares the standard k-ε and Chen-Kim turbulence models with experimental outcomes. The investigation utilizes experimental measurements and numerical simulations to comprehend flow dynamics. Upon juxtaposing the results with published experimental data, the current code displays favorable outcomes, motivating further theoretical exploration and parameter investigation. The sudden expansion backward-facing 's performance is evaluated across mass loading ratios. Computational findings emphasize the considerable influence of mass loading ratio on flow behavior. An increase in mass loading ratio leads to heightened solid phase concentration and distinct flow patterns.


Volume 46, Issue 4
(issued on 1/10/2023 in 6 Parts: Part (1) Electrical Engineering, Part (2) Mechanical Engineering, Part (3): Production Engineering, Part (4): Civil Engineering, Part (5) Architectural Engineering, Part (6) Basic Engineering Sciences)
October 2023
Pages 543-554