Journal of Food, Agriculture and Environment

Vol 8, Issue 1,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Boundary shear stresses in smooth channels


Babak Lashkar-Ara 1, Manoochehr Fathi-Moghadam 2*, Mahmud Shafai-Bajestan 3, Arash Jael 4

Recieved Date: 2009-10-17, Accepted Date: 2009-12-08


Experiments were conducted to investigate the distribution of boundary shear stress and boundary shear force on a smooth rectangular channel bed and walls. The boundary shear stress was measured using a 4-mm diameter Preston tube connected to a differential pressure transducer and a data acquisition system. The calibration curves proposed by Patel were used to convert the pressure readings to shear stress. The results were adjusted by the total shear force calculated from the energy method. A nonlinear regression-based technique was carried out to analyse the results and develop equations to determine the percentage of wall and bed shear force on the wetted perimeter of smooth rectangular channels. The proposed equations were compared with previous studies, and results have shown a high correlation coefficient and small standard deviation.


Shear stress, wall shear force, Preston tube, smooth channel

Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 1
Category: Environment
Pages: 343-347

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