Numerical study of particle deposition in a turbulent channel flow with transverse roughness elements on one wall |
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| Institution: | 1. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, George Begg Building, Sackville Street, M1 3BB Manchester, United Kingdom;2. Heat and Mass Transfer Laboratory, Swiss Federal Institute of Technology-EPFL, EPFL-STI-IGM-LTCM, Station 9, 1015 Lausanne, Switzerland;1. Mechanical Engineering Department, Ferdowsi University of Mashhad, P.O. Box 917751111, Iran;2. Food Machinery Design Department, Research Institute of Food Science and Technology (RIFST), P.O. Box 91735-147, km 12, Asian Highway, Mashhad, Iran;1. Facultad de Ingeniería, Doctorado en Ciencias de la Ingeniería, Universidad Central de Venezuela (UCV), Apartado Postal 47750, Caracas 1041-A, Venezuela;2. Área de Física de Procesos Irreversibles, Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco (UAM-A), Av. San Pablo 180, México D.F. 02200, Mexico;3. Centro de Física, Instituto Venezolano de Investigaciones Científicas, IVIC, Apartado Postal 20632, Caracas 1020-A, Venezuela;4. Departamento de Física, Instituto Nacional de Investigaciones Nucleares (ININ), Carretera México-Toluca S/N, La Marquesa, Ocoyoacac 52750, Estado de México, Mexico;5. ABACUS-Centro de Matemáticas Aplicadas y Cómputo de Alto Rendimiento, Departamento de Matemáticas, Centro de Investigación y de Estudios Avanzados (CINVESTAV-IPN), Carretera México-Toluca km. 38.5, La Marquesa, Ocoyoacac 52740, Estado de México, Mexico;6. Facultad de Ingeniería, Escuela de Metalurgia y Ciencia de los Materiales, Universidad Central de Venezuela (UCV), Apartado Postal 47750, Caracas 1041-A, Venezuela |
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| Abstract: | A numerical study is presented for the effect of wall roughness on the deposition of solid spherical particles in a fully developed turbulent channel flow based on large eddy simulation combined with a Lagrangian particle-tracking scheme. The interest is focused on particles with response times in wall units in the range of 2.5 ≤ τp+ ≤ 600 depositing onto a vertical rough surface consisting of two-dimensional transverse square bars separated by a rectangular cavity. Predictions of particle deposition rates are obtained for several values of the cavity width to roughness element height ratio and particle response time. It is shown that the accumulation of particles in the near wall region and their preferential concentration in flow areas of low streamwise fluid velocity that occur in turbulent flows at flat channels are significantly affected by the roughness elements. Particle deposition onto the rough wall is considerably increased, exhibiting a subtle dependence on the particle inertia and the spacing between the bars. The observed augmentation of deposition coefficient can be attributed to the flow modifications induced by the roughness elements and to the inertial impaction of particles onto the frontal deposition area of the protruding square bars. |
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