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Flow Field Characteristics of Particle-Laden Swirling Jets
Particle-laden turbulent jets have various engineering applications such as effluent discharge, wastewater disposal, and marine bed capping. The flow field of particle-laden swirling jets impinged into stagnant water was investigated using the combined high-speed imaging and Particle Image Velocimetry (PIV) measurements. A swirling chamber was designed with an inner diameter of 32 mm encompassed by six internal spiral water paths each having 4 mm inner diameters. Sand particles with a median diameter of 0.386 mm and an initial concentration of 60% were added through a funnel into the chamber to mix with the swirling water, and the mixture was discharged into stagnant water through an outlet nozzle with a diameter of do = 6 mm. The axial and radial distributions of velocity components were measured for two different swirling numbers of 0.50 and 0.65. It was found that sand–water swirling jets expanded moderately under induced recirculatory motion, formed a wider spray cone, and high radial velocity of sand particles. Due to formation of Precessing Vortex Core (PVC), the horizontal velocity profiles in the radial direction, r, experienced a near-field peak at r/do = 2. The axial velocity decay rate of jets with swirling numbers of 0.50 was found to be dissipated rapidly by increasing the swirling intensity from 0.50 to 0.65. The swirling motion increased the radial velocity distribution in comparison to the non-swirling sand–water jets. Two different clockwise and counterclockwise rotating vortices were observed throughout the recirculation zone which linked the internal and external shear layers. The flow oscillation and inter-scale dominant structures of the swirling jets were also investigated using the Spectral Proper Orthogonal Decomposition method (SPOD) and extracting energy-ranked spectra. It was found that a significant portion of turbulence kinetic energy of the jet was concentrated in the first five low-frequency modes.
Flow Field Characteristics of Particle-Laden Swirling Jets
Particle-laden turbulent jets have various engineering applications such as effluent discharge, wastewater disposal, and marine bed capping. The flow field of particle-laden swirling jets impinged into stagnant water was investigated using the combined high-speed imaging and Particle Image Velocimetry (PIV) measurements. A swirling chamber was designed with an inner diameter of 32 mm encompassed by six internal spiral water paths each having 4 mm inner diameters. Sand particles with a median diameter of 0.386 mm and an initial concentration of 60% were added through a funnel into the chamber to mix with the swirling water, and the mixture was discharged into stagnant water through an outlet nozzle with a diameter of do = 6 mm. The axial and radial distributions of velocity components were measured for two different swirling numbers of 0.50 and 0.65. It was found that sand–water swirling jets expanded moderately under induced recirculatory motion, formed a wider spray cone, and high radial velocity of sand particles. Due to formation of Precessing Vortex Core (PVC), the horizontal velocity profiles in the radial direction, r, experienced a near-field peak at r/do = 2. The axial velocity decay rate of jets with swirling numbers of 0.50 was found to be dissipated rapidly by increasing the swirling intensity from 0.50 to 0.65. The swirling motion increased the radial velocity distribution in comparison to the non-swirling sand–water jets. Two different clockwise and counterclockwise rotating vortices were observed throughout the recirculation zone which linked the internal and external shear layers. The flow oscillation and inter-scale dominant structures of the swirling jets were also investigated using the Spectral Proper Orthogonal Decomposition method (SPOD) and extracting energy-ranked spectra. It was found that a significant portion of turbulence kinetic energy of the jet was concentrated in the first five low-frequency modes.
Flow Field Characteristics of Particle-Laden Swirling Jets
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Sharif, F. (author) / Azimi, A. H. (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 47 ; 763-774
2023-08-17
12 pages
Article/Chapter (Book)
Electronic Resource
English
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