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Experimental Investigation on Scour Regions Induced by Circular Turbulent Wall Jets in Crossflow
https://orcid.org/http://orcid.org/0000-0003-3394-9100
https://orcid.org/http://orcid.org/0000-0002-4378-8315
https://orcid.org/http://orcid.org/0000-0003-0166-8830
The interaction between turbulent wall jet and crossflow current affects the morphology of river at the discharge point and significantly impacts riverbed topography. The current paper presents the results of a series of laboratory experiments on scour formation induced by turbulent wall jets in crossflow. The effect of secondary flow on scour formation was also studied by placing the jet in the upstream and downstream of a 90-degree channel bend. The river strength was quantified by the channel Froude number, Fr, and it ranged between 0.017 and 0.36. The jet discharge strength was evaluated by variations of jet Reynolds number, Re, and it varied from 16,190 to 48,402. All experiments were performed in deep submergence condition with jet submergence rates varied between 5.26 and 31.57. The maximum scour depths and scour areas were measured, and the results were compared for different hydrodynamic conditions. Three scour regions were identified and named as the main scour region (I) and the secondary scour regions (i.e., regions II and III). It was found that the second scour region (II) formed for Fr ≥ 0.091 under the effects of crossflow and the jet interaction immediately downstream of the jet. The third scour region (III) formed for Fr ≥ 0.146 due to crossflow separation above the sediment mound. Increasing the jet and channel flow strengths increased the maximum scour depth in scour regions, and maximum scour depths in the main scour region were larger than the other two regions. In relatively high flow strengths (i.e., Re = 48,402 and Fr = 0.17), the maximum scour depth in the second scour region reached to 67% of the maximum scour depth in the main scour region. Experimental results indicated that increasing the values of Re and Fr increased the scour area in both second and third scour regions and the secondary current increased the depth and area of scour in all three regions.
Experimental Investigation on Scour Regions Induced by Circular Turbulent Wall Jets in Crossflow
https://orcid.org/http://orcid.org/0000-0003-3394-9100
https://orcid.org/http://orcid.org/0000-0002-4378-8315
https://orcid.org/http://orcid.org/0000-0003-0166-8830
The interaction between turbulent wall jet and crossflow current affects the morphology of river at the discharge point and significantly impacts riverbed topography. The current paper presents the results of a series of laboratory experiments on scour formation induced by turbulent wall jets in crossflow. The effect of secondary flow on scour formation was also studied by placing the jet in the upstream and downstream of a 90-degree channel bend. The river strength was quantified by the channel Froude number, Fr, and it ranged between 0.017 and 0.36. The jet discharge strength was evaluated by variations of jet Reynolds number, Re, and it varied from 16,190 to 48,402. All experiments were performed in deep submergence condition with jet submergence rates varied between 5.26 and 31.57. The maximum scour depths and scour areas were measured, and the results were compared for different hydrodynamic conditions. Three scour regions were identified and named as the main scour region (I) and the secondary scour regions (i.e., regions II and III). It was found that the second scour region (II) formed for Fr ≥ 0.091 under the effects of crossflow and the jet interaction immediately downstream of the jet. The third scour region (III) formed for Fr ≥ 0.146 due to crossflow separation above the sediment mound. Increasing the jet and channel flow strengths increased the maximum scour depth in scour regions, and maximum scour depths in the main scour region were larger than the other two regions. In relatively high flow strengths (i.e., Re = 48,402 and Fr = 0.17), the maximum scour depth in the second scour region reached to 67% of the maximum scour depth in the main scour region. Experimental results indicated that increasing the values of Re and Fr increased the scour area in both second and third scour regions and the secondary current increased the depth and area of scour in all three regions.
Experimental Investigation on Scour Regions Induced by Circular Turbulent Wall Jets in Crossflow
https://orcid.org/http://orcid.org/0000-0003-3394-9100
https://orcid.org/http://orcid.org/0000-0002-4378-8315
https://orcid.org/http://orcid.org/0000-0003-0166-8830
The interaction between turbulent wall jet and crossflow current affects the morphology of river at the discharge point and significantly impacts riverbed topography. The current paper presents the results of a series of laboratory experiments on scour formation induced by turbulent wall jets in crossflow. The effect of secondary flow on scour formation was also studied by placing the jet in the upstream and downstream of a 90-degree channel bend. The river strength was quantified by the channel Froude number, Fr, and it ranged between 0.017 and 0.36. The jet discharge strength was evaluated by variations of jet Reynolds number, Re, and it varied from 16,190 to 48,402. All experiments were performed in deep submergence condition with jet submergence rates varied between 5.26 and 31.57. The maximum scour depths and scour areas were measured, and the results were compared for different hydrodynamic conditions. Three scour regions were identified and named as the main scour region (I) and the secondary scour regions (i.e., regions II and III). It was found that the second scour region (II) formed for Fr ≥ 0.091 under the effects of crossflow and the jet interaction immediately downstream of the jet. The third scour region (III) formed for Fr ≥ 0.146 due to crossflow separation above the sediment mound. Increasing the jet and channel flow strengths increased the maximum scour depth in scour regions, and maximum scour depths in the main scour region were larger than the other two regions. In relatively high flow strengths (i.e., Re = 48,402 and Fr = 0.17), the maximum scour depth in the second scour region reached to 67% of the maximum scour depth in the main scour region. Experimental results indicated that increasing the values of Re and Fr increased the scour area in both second and third scour regions and the secondary current increased the depth and area of scour in all three regions.
Experimental Investigation on Scour Regions Induced by Circular Turbulent Wall Jets in Crossflow
Lecture Notes in Civil Engineering
Desjardins, Serge (editor) / Azimi, Amir Hossein (editor) / Poitras, Gérard J. (editor) / Nouri, Meysam (author) / Ilkhanipour, Rasoul (author) / Azimi, Amir Hossein (author)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
Proceedings of the Canadian Society for Civil Engineering Annual Conference 2023, Volume 9 ; Chapter: 14 ; 191-203
2024-10-10
13 pages
Article/Chapter (Book)
Electronic Resource
English
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