TY  - BOOK
AU  - Mahmoud Mostafa Ragab Mostafa, 
AU  - Ahmed Mohamed Helmy 
AU  - Mohamed Attia Mohamed 
TI  - Energy dissipation In treated sewage pipeline with steep slope using novel-shaped orifice plates / 
U1  - 627.05 
PY  - 2025///
KW  - Hydraulic engineering
KW  - الهندسة الهيدروليكية
KW  - Energy Dissipation
KW  - Head Losses
KW  - Novel-Shaped Orifice Plate
KW  - Opening  Ratio
N1  - Thesis (M.Sc)-Cairo University, 2025; Bibliography: pages 44-48; Issues also as CD
N2  - In this research, a new design of "orifice plate" is developed to allow for energy 
dissipation with a low probability of clogging. The impact of changing the hydraulic and 
geometrical parameters of the orifice plate on the head loss coefficient is experimentally 
investigated. The head loss coefficients for the different opening ratios of the proposed 
orifice plates are obtained. The effect of using multistage orifice plates on the head loss 
coefficient is also investigated. Results show that the head loss coefficient remains 
unchanged for flows with Reynolds numbers (Re > 105), which is the operating condition 
for most steep-slope pipelines. The head loss coefficient was found to be 5.11, 2.48, 1.50, 
and 0.81 for opening ratios of 0.50, 0.60, 0.70, and 0.80, respectively. In the case of 
multistage orifices, the head loss coefficient remained unchanged compared to that for a 
single orifice as long as the orifices are spaced by 10 D and the total head loss coefficient 
for this configuration equals the head loss coefficient for a single orifice times the number 
of orifices in the configuration. This configuration can be utilized to create multiple local 
losses along the pipeline to gradually dissipate the required head and reduce the 
probability of cavitation.; تم استحداث تصميم جديد للألواح المثقوبة لتشتيت الطاقة مع تقليل احتمالات الانسداد. أُجريت دراسة معملية لتحليل تأثير العوامل الهيدروليكية وأشكال الألواح على معامل فقدان الطاقة. أظهرت النتائج أن معامل الفقد لا يتأثر برقم رينولدز عندما يكون Re > 1×10⁵. كما تبين أن معامل الفقد يبلغ 5.11 و2.48 و1.50 و0.81 لنسب الفتح 50%-60%-70%-80% على التوالي. عند استخدام عدة ألواح متتالية، يكون الفقد الكلي مساويًا لمعامل فقد اللوح الواحد مضروبًا في عدد الألواح. يتيح هذا الترتيب تشتيت الطاقة تدريجيًا وتقليل خطر التكهف في خطوط الأنابيب شديدة الانحدار
ER  -