EFFECT OF SEPARATING WALL GEOMETRY ON FLOW PATTERN OF A LARGE-SCALED 90O OPEN-CHANNEL JUNCTION

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MOHAMMADIUN S.; SALEHI NEYSHABOURI S.A.A.; PARHIZKAR H.; VAHABI H.

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:3 Page(s): 165-175

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Title

EFFECT OF SEPARATING WALL GEOMETRY ON FLOW PATTERN OF A LARGE-SCALED 90O OPEN-CHANNEL JUNCTION

Author(s)

MOHAMMADIUN S. | SALEHI NEYSHABOURI S.A.A. | PARHIZKAR H. | VAHABI H. | Issue Writer Certificate

Keywords

OPEN-CHANNEL JUNCTIONQ2

SEPARATING WALLQ2

NUMERCIAL MODELQ2

EROSIONQ2

SEDIMENTATIONQ2

Abstract

OPEN-CHANNEL JUNCTIONs have a broad application in civil and environmental engineering. Formation of a low-pressure zone with recirculating flow (high SEDIMENTATION potential) accompanied by a high-velocity zone (high EROSION potential) are the most characteristic features of flow in junctions. A large number of researches have been performed to grasp the complicated concept of hydraulic phenomena and correct the related deficiencies in the straight junction of open-channel flows. The interaction between the main and branch flows, causes the main flow to be diverted toward the opposite bank of junction and this interaction creates a separation zone at the downstream corner of the junction. Formation of a three dimensional (3D) separation zone with lower pressure immediately near the branch-side bank is one of the most distinctive characteristics of a flow in OPEN-CHANNEL JUNCTIONs. In addition to, the recirculating flow in this low-pressure zone not only prepares a suitable space for SEDIMENTATION which is a common problem in hydraulic structures that can block intakes or junctions, but also increases the velocity near the opposite bank of the main channel and its bed and thereby leads to local EROSION. Thus, reducing the SEDIMENTATION potential in recirculation zone and eliminating the EROSION near the opposite wall of the channel are two major concerns for designers of OPEN-CHANNEL JUNCTIONs. For this purpose, different researches from using submerged vanes in main channel to the geometrical modifications of the junction entrance, have been conducted to improve the flow pattern around the junctions. Therefore, implementing a SEPARATING WALL in the middle of the branch channel is thoroughly investigated in this research to understand its effect on the flow pattern and also its contribution in reducing the SEDIMENTATION and EROSION potential in an OPEN-CHANNEL JUNCTION. Initially, the numerical two-phase model of a previous experimental study, is prepared and its results are validated. Following that, a one-phase model is prepared based on the fact that the difference between maximum and mean elevation of water free surface is less than 10%. According to the negligible (less than 3%) discrepancy between numerical one-phase and two-phase results in predicting the maximum U* after the junction in channel, acceptable similarity between U* contours and U* variation along the flow depth in numerical (one-phase) and experimental studies and considerable increase in computation time of two-phase analysis, one-phase analysis is implemented instead of two-phase one in the rest of this research.Finally, effects of SEPARATING WALL are evaluated in a large-scaled industrial 90o OPEN-CHANNEL JUNCTION and some new geometrical efficiency measurements are devised and assessed to improve the wall performance. Among proposed geometrical modifications on the wall head, semicircular profile had the best performance in reducing the maximum velocity after the junction. The results show a considerable improvement in flow pattern which causes a significant reduction in SEDIMENTATION and EROSION potential in OPEN-CHANNEL JUNCTIONs.

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APA: Copy

MOHAMMADIUN, S., SALEHI NEYSHABOURI, S.A.A., PARHIZKAR, H., & VAHABI, H.. (2016). EFFECT OF SEPARATING WALL GEOMETRY ON FLOW PATTERN OF A LARGE-SCALED 90^O OPEN-CHANNEL JUNCTION. MODARES CIVIL ENGINEERING JOURNAL, 16(3), 165-175. SID. https://sid.ir/paper/256686/en

Vancouver: Copy

MOHAMMADIUN S., SALEHI NEYSHABOURI S.A.A., PARHIZKAR H., VAHABI H.. EFFECT OF SEPARATING WALL GEOMETRY ON FLOW PATTERN OF A LARGE-SCALED 90^O OPEN-CHANNEL JUNCTION. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(3):165-175. Available from: https://sid.ir/paper/256686/en

IEEE: Copy

S. MOHAMMADIUN, S.A.A. SALEHI NEYSHABOURI, H. PARHIZKAR, and H. VAHABI, “EFFECT OF SEPARATING WALL GEOMETRY ON FLOW PATTERN OF A LARGE-SCALED 90^O OPEN-CHANNEL JUNCTION,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 3, pp. 165–175, 2016, [Online]. Available: https://sid.ir/paper/256686/en

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