000			04141namaa22004331i 4500
003			EG-GICUC
005			20251221124324.0
008			251129s2025 ua a|||frm||| 000 0 eng d
040			_aEG-GICUC _beng _cEG-GICUC _dEG-GICUC _erda
041	0		_aeng _beng _bara
049			_aDeposit
082	0	4	_a627.05
092			_a627.05 _221
097			_aM.Sc
099			_aCai01.13.05.M.Sc.2025.Ma.E
100	0		_aMahmoud Mostafa Ragab Mostafa, _epreparation.
245	1	0	_aEnergy dissipation In treated sewage pipeline with steep slope using novel-shaped orifice plates / _cby Mahmoud Mostafa Ragab Mostafa ; Supervisors Prof. Dr. Ahmed Mohamed Helmy, Prof. Dr. Mohamed Attia Mohamed.
246	1	5	_aتشتيت الطاقة في خطوط الانابيب شديدة الانحدار عن طريق تصميم جديد للالواح المثقوبة
264		0	_c2025.
300			_a48 pages : _billustrations ; _c30 cm. + _eCD.
336			_atext _2rda content
337			_aUnmediated _2rdamedia
338			_avolume _2rdacarrier
502			_aThesis (M.Sc)-Cairo University, 2025.
504			_aBibliography: pages 44-48.
520		3	_aIn 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.
520		3	_aتم 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.
530			_aIssues also as CD.
546			_aText in English and abstract in Arabic & English.
650		0	_aHydraulic engineering
650		0	_aالهندسة الهيدروليكية
653		1	_aEnergy Dissipation _aHead Losses _aNovel-Shaped Orifice Plate _aOpening Ratio
700	0		_aAhmed Mohamed Helmy _ethesis advisor.
700	0		_aMohamed Attia Mohamed _ethesis advisor.
900			_b01-01-2024 _cAhmed Mohamed Helmy _cMohamed Attia Mohamed _dAhmed Wagdy Abdeldayem _dAnas Mohamed El-Molla _UCairo University _FFaculty of Engineering _DDepartment of Irrigation and Hydraulics Engineering
905			_aShimaa _eEman Ghareb
942			_2ddc _cTH _e21 _n0
999			_c176335