کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
708572 892011 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Free overfalls in flat-based circular and U-shaped channels
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
پیش نمایش صفحه اول مقاله
Free overfalls in flat-based circular and U-shaped channels
چکیده انگلیسی

This paper presents a theoretical model based on the free vortex theorem that is capable of predicting the pressure head distribution at the brink of free overfalls in open channels. This approach is coupled with the momentum equations to obtain the end-depth-ratio (EDR) from which the discharge can be estimated. In order to illustrate its flexibility, the theory is successfully applied to flat-based circular and U-shaped channels. Using previous experimental data, the proposed method is validated.

Figure optionsDownload as PowerPoint slideResearch highlights
► In U-shaped channels, the value of the EDR is approximately 0.75 for a value of yˆc=0.5.
► In flat based circular channels, the EDR can be considered as a constant when hˆc≤0.8.
► In subcritical flow the theoretical results enable one to estimate the discharge within 4%.
► At low relative depths the overall end pressure coefficient has been shown to be 0.33.
► This method can also be applied when the approaching flow is super-critical.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flow Measurement and Instrumentation - Volume 22, Issue 1, March 2011, Pages 17–24
نویسندگان
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