AN EXPERIMENTAL STUDY OF THE EFFECT OF A SMALL-SCALE RECTANGULAR CANAL'S WALL ROUGHNESS ON THE FLOW PATTERNS IN A 90O SHARP BEND WITH A RADIUS OF CURVATURE TO THE BOTTOM WIDTH RATIO OF 2

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GHADOO Y.; SHAFAI BEJESTAN M.; SOOZEPOOR A.

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Journal Paper

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Journal: Journal of Water Resources Engineering Year:2014 | Volume:7 | Issue:22 Page(s): 23-35

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Title

AN EXPERIMENTAL STUDY OF THE EFFECT OF A SMALL-SCALE RECTANGULAR CANAL'S WALL ROUGHNESS ON THE FLOW PATTERNS IN A 90O SHARP BEND WITH A RADIUS OF CURVATURE TO THE BOTTOM WIDTH RATIO OF 2

Author(s)

GHADOO Y. | SHAFAI BEJESTAN M. | SOOZEPOOR A. | Issue Writer Certificate

Keywords

SHARP BENDQ2

WALL ROUGHNESSQ2

ROTATIONAL CELLQ2

SHEAR STRESSQ2

Abstract

The wetted perimeter's roughness, the radius of curvature and its ratio to the bottom width affect the flow velocity and its patterns. This laboratory study was conducted in a 90° SHARP BEND flume with a rectangular cross-sectional area, and the radius of curvature to the bottom with ratio of 2. The experiments were conducted under a constant Froude No. of 0.17 with 3 WALL ROUGHNESSes of 0.5, 2.0 and 5.0 mm. The three components of the flow velocity were measured at 480 points. The flow lines in the high velocity zone of 30° to 60° were mostly deflected towards the inner wall and along the channel depth. However, they gradually turned towards the outer wall where the deflection angle exceeded 60o. Further, the main ROTATIONAL CELL of the secondary flow was formed close to the inner wall at all 3 roughnesses at the 60o alignment of the bend. An increase in the WALL ROUGHNESS delayed the decay of the ROTATIONAL CELL at the bend's termination. It was also observed that the bed SHEAR STRESS was increased in the highly stressed area with an increase in the WALL ROUGHNESS. The area delimited by the 70o and 80o was singled out showing the highest SHEAR STRESS. Moreover, it was established that the secondary flow strength at any cross sectional area decreased with an increased in the WALL ROUGHNESS.

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References

STUDY OF FLOW CHARACTERISTICS IN CURVED OPEN CHANNELS HAVING ERODIBLE BED AND RIGID WALLS

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APA: Copy

GHADOO, Y., SHAFAI BEJESTAN, M., & SOOZEPOOR, A.. (2014). AN EXPERIMENTAL STUDY OF THE EFFECT OF A SMALL-SCALE RECTANGULAR CANAL'S WALL ROUGHNESS ON THE FLOW PATTERNS IN A 90^O SHARP BEND WITH A RADIUS OF CURVATURE TO THE BOTTOM WIDTH RATIO OF 2. WATER ENGINEERING, 7(22), 23-35. SID. https://sid.ir/paper/169564/en

Vancouver: Copy

GHADOO Y., SHAFAI BEJESTAN M., SOOZEPOOR A.. AN EXPERIMENTAL STUDY OF THE EFFECT OF A SMALL-SCALE RECTANGULAR CANAL'S WALL ROUGHNESS ON THE FLOW PATTERNS IN A 90^O SHARP BEND WITH A RADIUS OF CURVATURE TO THE BOTTOM WIDTH RATIO OF 2. WATER ENGINEERING[Internet]. 2014;7(22):23-35. Available from: https://sid.ir/paper/169564/en

IEEE: Copy

Y. GHADOO, M. SHAFAI BEJESTAN, and A. SOOZEPOOR, “AN EXPERIMENTAL STUDY OF THE EFFECT OF A SMALL-SCALE RECTANGULAR CANAL'S WALL ROUGHNESS ON THE FLOW PATTERNS IN A 90^O SHARP BEND WITH A RADIUS OF CURVATURE TO THE BOTTOM WIDTH RATIO OF 2,” WATER ENGINEERING, vol. 7, no. 22, pp. 23–35, 2014, [Online]. Available: https://sid.ir/paper/169564/en

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