Investigation Of Effect Of Spacing Between Lateral Square Bars On Channel Bed Resistance

Date

2023-4-25

Author

Özgünlü, Mert

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Irregularities of solid surfaces affect the friction between the surface and the flowing fluid. Surface irregularities are generally defined as 'roughness', which implies an increase in bed resistance and additional dissipation from flow energy. Thus, surface finishing is critical in many engineering applications to minimize energy losses. However, there are specially designed hydraulic structures where the purpose is to dissipate the flow energy. A typical application is to place large-scale obstructions on the bed as macro roughness elements so that more flow energy is dissipated by increased bed resistance. This study aims to investigate the effect of spacing between square cross-sectioned bars fixed laterally on the bed of a prismatic laboratory channel on energy dissipation using experimental methods. Different rib spacings, in other words, pitch distances (p=32, 16, 8, 4, 2 cm) have been analysed, and it is found that up to a limit (p/k=16, where k is the square rib dimensions) when rib spacing decreases, bed resistance increases. However, after the limit, decreasing the spacing does not increase the bed resistance but decreases it.

Subject Keywords

Bed roughness, Friction factor, Open channel flow, Rib roughness, Uniform flow

URI

https://hdl.handle.net/11511/103232

Collections

Graduate School of Natural and Applied Sciences, Thesis