Characterization of the Velocity Field External to a Tube Bundle Using Spatial Filter Velocimetry Based on Variable Meshing Scheme
| Autor: | Kosuke Hayashi, Gherhardt Ribatski, Shigeo Hosokawa, Fabio Toshio Kanizawa, Douglas Martins Rocha, Akio Tomiyama |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Spatial filter General Chemical Engineering General Physics and Astronomy Reynolds number 02 engineering and technology Mechanics Velocimetry Wake 01 natural sciences 010305 fluids & plasmas External flow ENGENHARIA MECÂNICA Physics::Fluid Dynamics symbols.namesake 020303 mechanical engineering & transports 0203 mechanical engineering Flow (mathematics) Bundle 0103 physical sciences symbols Vector field Physical and Theoretical Chemistry |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1573-1987 1386-6184 |
| DOI: | 10.1007/s10494-020-00143-z |
| Popis: | This paper presents results for the experimental vector velocity field obtained through spatial filter velocimetry in a triangular tube bundle with tubes of 20 mm O.D. and a transverse pitch of 25.2 mm. The experiments were conducted for single-phase water flows with Reynolds numbers ranging from 447 to 1842, and for air–water two-phase bubbly flow with liquid Reynolds number of 909 and gas Reynolds number of 42. The vector velocity field for each experimental condition was obtained using a variable meshing scheme to improve the spatial resolution in regions of low velocities. The results indicate that the variable meshing strategy is promising to increase the spatial resolution of the spatial filter velocimetry technique and to release from the constraint imposed by the uniform window sizes, especially for experimental data obtained with relatively low frame rates. Details of the flow structure of external flow across tube bundles, such as the near-wall velocity profiles, wake region and the effects of the gas buoyancy on vertical mean velocities are presented in this paper with high temporal and spatial resolution, which can be useful for validation of numerical models. |
| Databáze: | OpenAIRE |
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