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alkej-347
Experimental and Numerical Research on Flow-Induced Vibration in Valves
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Abstract  

All central air conditioning systems contain piping system with various components, sizes, material, and layouts. If such systems in operating mode, the flow in piping system and its component such as valves can produce severe vibration due to some flow phenomenon’s. In this research, experimental measurements and numerical simulation are used to study the flow-induced vibration in valves. Computational fluid dynamics (CFD) concepts are included with one-way and two-way fluid-structure interaction concepts by using finite element software Package (ANSYS 14.57). Detection analysis is performed on flow characteristics under operation conditions and relations with structural vibration. Most of real geometrical, operational, and boundary conditions are simulated to obtain best similarity with real operation conditions. Comparisons performed between experimental data and numerical results (one-way and two-way simulation) to verify the results. The main conclusion was drawn from the study that the dominant source of vibration for valve is the water pulsation in addition to amount of water hammering. In addition, the main source of water pulsation in globe valve is the vortex shedding and pressure difference between upstream and downstream of valve. The vibration amplitude was increased with increasing flow rate until to be maximum when the flow rate around 30% and then decreased until flow rate reaches to around 85% and then trends to be constant.

Keywords: Flow-induced vibration, vortex shedding, pressure pulsation, valve, finite element, ANSYS, fast Fourier transform (FFT).

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Publication Date
Mon Oct 15 2018
Journal Name
Arab Science Heritage Journal
نحو نظام نحو نظام لغوي عربي متوازن في المساواة بين الرجل والمرأة
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We must live in an era dominated by the call for equality between men and women, in which the voices of advocates of gender integration were heard. After women opened their doors to compete with their brother, Knowledge, and culture in the various forms of life, language as a science of the time and knowledge of the other had to match this reality and express the most accurate expression of this task

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Publication Date
Fri Jan 04 2013
Journal Name
المجلة السياسية والدولية
عوامل تكوين الرأي العام وتأثيره في السياسه الخارجيه المصريه بعد عملية التغيير
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Publication Date
Tue Dec 31 2013
Journal Name
Journal Of The College Of Languages
إيقــاع النفـــس الشـــاعـرة في شعر الشاعر الصّقلي علي بن عبد الرحمن البلـَّنوبي
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درست الباحثة البنية الإيقاعية عند الشاعر الصقلي

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Publication Date
Fri Apr 12 2019
Journal Name
Journal Of Economics And Administrative Sciences
الهبة الديموغرافية وإستثمارها في التنمية الإقتصادية رؤية واقعية للعراق بعد عام 2003
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Abstract

   The relationship between population and development is one of the most interrelated relations in contemporary societies. Therefore it is important focus on the demographic aspects of the population and its integration with developmental aspects, because the population is the makers of development and responsible for its success. The population composition and their qualitative composition are important factors in development. This change in age rate is because of demographic operations which lasted for long time. The change we are talking about is happing currently in Arab cou

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Publication Date
Tue Apr 01 2008
Journal Name
Journal Of Educational And Psychological Researches
الطفولة في العراق بين جهود التنمية وتحديـــات الوضــــع الراهــن قســم الخدمـة الاجتماعيـة
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      اهتمت المجتمعات العالمية في الآونة الأخير بفئة الأطفال ، ورعاية الطفولة وذلك لما لها من أهمية كبيرة في مستقبل المجتمع ، وتنميتة وتقدمه . لأنها يعتمد عليها في تقدم وتطور المجتمع فـي جميع المجالات الاقتصادية والاجتماعية والثقافية . ومن هنا ارتبطت الطفولة بالحياة برباط عضوي فالأطفال براعم الحياة ومع هذه البراعم تستمر الحياة لذلك اهتمت دول العالم بوضع البرامج وعقد المؤتمرات من اجل النهوض

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Publication Date
Sun Nov 04 2018
Journal Name
Arab Science Heritage Journal
شروط شروط الكتابة والوزارة في كتاب النصيحة لقابوس نامه (دراسة تاريخية مقارنة)
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Prince Kikaus  explained  to us Conditions of writing and establishing .Then he touched  upon the Conditions of the ministry and qualities that must be characterized Author and minister both need machines must be availabla in person if given these positions .he was creative in presenting his ideas which is not  without judgment an knowledge.He had a distinct style in mentioned professions and administrative hierarchy As explained in his speech About the writer and his Correspondence and construction and writer position who has developed into a minister then he touched it to the cabinet system and what the minister should do.of qualities .and the importance of the post of minister who mentioned several points to him ou

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Publication Date
Mon Oct 15 2018
Journal Name
Arab Science Heritage Journal
رواد رواد علم الفلك في العصر العباسي أولاد موسى بن شاكر أنموذجاً
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Is astronomy in the Abbasid era one of the sciences that Muslims developed at that time? The restriction of students at the hands of a large number of students, which increased the development and increase the value of monitoring mechanisms and their outstanding efforts in support and development of the Arab civilization of Islam

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Publication Date
Sun Apr 03 2016
Journal Name
Journal Of Educational And Psychological Researches
تطوير الكفايات التدريسية للأستاذ الجامعي في ضوء معايير دورة ديمنغ للجودة (PCDA)
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The problem of the present study lies in the challenges that college education especially that concerns the quality of college teachers performance and developing the level of educational process quality.

This study aimed at constructing a vision the researchers have constructed depending on the standards of performance quality represented by Deming's quality course. The researchers presented a number of skills that should be existed in the performance of college teacher through using the analytic and constructing approach in imagining this drawing to develop performance.

The study results represented by a number of efficiencies that college  teachers shoul

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Publication Date
Tue Jan 01 2019
Journal Name
Journal Of The College Of Languages (jcl)
Self-rhythm of the Belenoby Poet
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Al- belenoby , Andalusian obscure poet .I choose to study poetic rhythm in this poetic and the appropriateness of with what  rhythm touring in his self to give beautiful meaning raise to receiver to put the hands of continental placements creativity in poetry .I divided my research into ideas are presented in a sequential manner , I started researching with poetic rhyme than rhyme they represent the form of the poem, they represent the external form of the poem and their music that farm the general concept then the rhetorical styles that represent the internal form of the poem and it music that the listener works and enjoying it part by part all this led to the put the hands of the receiver placement creativity in Belenoby Poet.&nbs

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Publication Date
Wed Jun 01 2016
Journal Name
Journal Of The College Of Languages (jcl)
Las preposiciones en español: Estudio analítico de "Por" y "Para"
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Resumen

                       Este trabajo de investigación ofrece uno de los temas relevantes en la lengua, el cual es estudiar las dimensiones sintácticas, semánticas y pragmáticas de las preposiciones, en general, y de las dos preposiciones "Para" y  "Por" en concreto, en una unidad linguística más amplia que la llamada "Oración". En la parte  referida al  estudio de las dos preposiciones mencionadas,  estudiamos sus distntos usos funcionales, usos que se acercan, unas veces,  entre sí  y  se alejan en otras. 

Abstract    

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