کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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709447 | 892072 | 2011 | 8 صفحه PDF | دانلود رایگان |
Sharp-crested rectangular weirs used for discharge measurement in channels and laboratories are experimentally investigated. Height and width of weir plate are the two parameters characterizing the head-discharge relationship. Laboratory experiments are conducted by measuring the discharge and the head over the weir for variable weir heights and widths. Applicability of various formulations for the discharge coefficient are investigated. Experiments indicate that discharge is independent of weir height, when the weir is operated within an appropriate discharge range. Average velocity over the weir plotted against the weir head displays universal characteristics such that it can be used in the expression of discharge over the weir, eliminating the need for a discharge coefficient. The head-discharge relationship for a rectangular weir has distinct features for the partially contracted weirs and for the fully contracted slit weirs.
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► Sharp-crested rectangular weirs are experimentally investigated.
► Weirs are divided as partially contracted and fully contracted.
► Discharge coefficient formulations are compared.
► Weir velocity formulation is introduced.
Journal: Flow Measurement and Instrumentation - Volume 22, Issue 2, April 2011, Pages 144–151