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The near-field flow structure in triple buoyant plumes

DOI: 10.1615/ICHMT.2015.THMT-15.220
pages 167-170

S. Yin
Department of Mechanical Engineering, Faculty of Engineering, The University of Hong Kong, Hong Kong SAR

K.M. Lam
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong

M. Sandberg
Faculty of Engineering and Sustainable Development, University of Gävle, Gävle, Sweden

Y. Li
Department of Mechanical Engineering, The University of Hong Kong, Pok Fu Lam Road, 999077, Hong Kong SAR

Résumé

This paper presents laboratory measurement results on the flow structure in triple buoyant plumes. Two fundamental flow regions, a merging region and a combined region, are clearly identified and a basic flow evolution process is observed, in that the triple plumes gradually incline to each other in the merging region, then achieve a smooth velocity profile in the combined region. The combined height where multiple velocity peaks joint into one, significantly depends on the source spacing ratio (SR). In a smaller SR of 0.2, the combined region can easily establish prior to Z/h=3, which makes the triple plumes behave like a "single" plume. In a larger SR of 1.5, multiple axial velocity peaks are preserved from Z/h=3 to Z/h=9. Under such circumstances, a longer downstream distance, which is beyond Z/h=9, is required for triple plumes to achieve a combined state.

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