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    Void Fraction Distribution Downstream of Nonlinear Weirs: An Experimental Investigation Using Trapezoidal A-Type Piano Key Weirs, a Labyrinth Weir, and a Linear Weir

    Source: Journal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 003::page 04025006-1
    Author:
    Biruk S. Belay
    ,
    Mario Oertel
    DOI: 10.1061/JHEND8.HYENG-14118
    Publisher: American Society of Civil Engineers
    Abstract: This experimental study investigates the behavior of void fraction distribution downstream of nonlinear weirs. Systematic air concentration measurements were performed in a 3D array for two model pairs: (1) a piano key weir and a labyrinth weir, and (2) a piano key weir and a reference linear weir. For the labyrinth and piano key weirs tested herein, the results revealed a significant variation of depth-averaged void fraction within the channel cross-section. Under limited tailwater conditions, interaction of spreading plunging jet shockwaves from the inlet keys remained significant, leading to higher void fractions along the adjacent outlet keys due to the formation of standing waves. However, this cross-sectional variation is moderated as the effect of plunging jets reduces with increasing tailwater depth. Alignment of an inlet key with the sidewall also induced standing waves that further contributed to the lateral variability of air concentrations. The findings further indicated that the labyrinth weir yields higher void fraction compared to the piano key weir under similar hydraulic conditions, highlighting the role of weir type and geometry. Additionally, 3D surfaces and contour profiles of depth-averaged void fraction were derived using high-resolution measurements downstream of the second model pair that showed substantial differences between nonlinear and linear weirs. Furthermore, a simplified relationship was established using the upstream and downstream flow depths to parameterize the behavior of the depth-averaged void fraction. Exponential detrainment trends were observed in all cases along the flow, and classic depth-concentration profiles were found to replicate the observations in these experiments.
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      Void Fraction Distribution Downstream of Nonlinear Weirs: An Experimental Investigation Using Trapezoidal A-Type Piano Key Weirs, a Labyrinth Weir, and a Linear Weir

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    contributor authorBiruk S. Belay
    contributor authorMario Oertel
    date accessioned2025-08-17T22:47:22Z
    date available2025-08-17T22:47:22Z
    date copyright5/1/2025 12:00:00 AM
    date issued2025
    identifier otherJHEND8.HYENG-14118.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307452
    description abstractThis experimental study investigates the behavior of void fraction distribution downstream of nonlinear weirs. Systematic air concentration measurements were performed in a 3D array for two model pairs: (1) a piano key weir and a labyrinth weir, and (2) a piano key weir and a reference linear weir. For the labyrinth and piano key weirs tested herein, the results revealed a significant variation of depth-averaged void fraction within the channel cross-section. Under limited tailwater conditions, interaction of spreading plunging jet shockwaves from the inlet keys remained significant, leading to higher void fractions along the adjacent outlet keys due to the formation of standing waves. However, this cross-sectional variation is moderated as the effect of plunging jets reduces with increasing tailwater depth. Alignment of an inlet key with the sidewall also induced standing waves that further contributed to the lateral variability of air concentrations. The findings further indicated that the labyrinth weir yields higher void fraction compared to the piano key weir under similar hydraulic conditions, highlighting the role of weir type and geometry. Additionally, 3D surfaces and contour profiles of depth-averaged void fraction were derived using high-resolution measurements downstream of the second model pair that showed substantial differences between nonlinear and linear weirs. Furthermore, a simplified relationship was established using the upstream and downstream flow depths to parameterize the behavior of the depth-averaged void fraction. Exponential detrainment trends were observed in all cases along the flow, and classic depth-concentration profiles were found to replicate the observations in these experiments.
    publisherAmerican Society of Civil Engineers
    titleVoid Fraction Distribution Downstream of Nonlinear Weirs: An Experimental Investigation Using Trapezoidal A-Type Piano Key Weirs, a Labyrinth Weir, and a Linear Weir
    typeJournal Article
    journal volume151
    journal issue3
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/JHEND8.HYENG-14118
    journal fristpage04025006-1
    journal lastpage04025006-14
    page14
    treeJournal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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