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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 Dec 01 2008
Journal Name
Journal Of Economics And Administrative Sciences
السياسة النقدية في العراق بعد 9/4/2003 (الواقع والطموح)
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لا يستطيع كل كائن حي أو كيان اجتماعي أداء دوره الذي يفترض أن يقوم به ما لم يمتلك الوسائل الكافية والضرورية لأداء ذلك الدور قال سبحانه وتعالى ((قال ربنا الذي أعطى كل شيء خلقه ثم هدى طه 50)).

والنشاط الاقتصادي كجزء من الكيان الكلي للمجتمع لا يختلف عن هذه القاعدة، إذ عندما يراد من النظام الاقتصادي أداء دور فاعل فلا غنى له عن الوسائل التي تمكنه من أداء دوره المنشود. للنظام الاقتصادي مجمو

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Publication Date
Tue Jan 12 2021
Journal Name
Arab Science Heritage Journal
الفاظ الحــــــــــــــــــرب ودلالاتها في الشعر العباسي شعر صــــــر در أنموذجــــــــــــــــــا
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      That art and poetic creativity is not associated with a certain time and place and that artistic inspiration is a gift from God loved to a group of individuals so that their experiences be simulated speaking to the insides of the human self and that the creativity of the artist poet lies in the purpose of what is familiar and accepted and mocked for this purpose to

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Publication Date
Tue Jan 01 2008
Journal Name
Journal Of Educational And Psychological Researches
مستويات التقويم والتصانيف التي تضمنتها في اسئلة امتحان مادة التاريخ
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      جاء التقويم  ليكون مكملا للعمليات التعليمية يساعد على الوقوف على نتائجها وسبل النهوض بها والوقوف على المعوقات التي تقف امام مسيرتها وقد عنيت عمليات التقويم باهتمام كبير من قبل القائمين على العمليات التعليمية اذ عقدت العديد من المؤتمرات والندوات واجريت العديد من الدراسات عالميا ومحليا من اجل الوقوف على هذه العملية المهمة الداعمة للتعليم والنهوض بمستويات المتعلمين ، ومن بي

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Publication Date
Tue Nov 06 2018
Journal Name
Arab Science Heritage Journal
دور دور الوزير الفاطمي اليازوري وسياسته الداخلية والخارجية في مصر
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Anhdralazuri of Yazour a village Ramle Palestine, from a religious family of Abu Mohammed Yazouri arrived in Egypt in the year (439 AH / 1036 AD), and was aimed from behind, returned him to his previous position to assume spend Ramle, Fasttaa a senior statesmen to provide Abu Muhammad Yazouri L. Caliph assuming start, Vtm him so, raising its standing and became MetwallyDiwan or caliph, in the year (441 AH / 1049 AD) was assigned the Chief Justice did not stop at that, but the era of his post of the ministry a year (442 AH / 1051 AD), having proven merit in every Matulah, The minister Yazouri of the powerful minister aspiring and employers pens won several titles did not collect it for one by the judiciary, advocacy and ministry granted C

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Publication Date
Sat Jan 05 2019
Journal Name
Journal Of Planner And Development
التفاوت التنموي المكاني في العراق بمقاييس تنموية مقترحة واليات مواجهته
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Publication Date
Thu Dec 20 2007
Journal Name
Journal Of Planner And Development
The Weighted Index Number Method
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The process of identifying the region is not an easy process when compared with other operations within the attribute or similarity. It is also not difficult if the process of identifying the region is based on the standard and standard indicators in its calculation. The latter requires the availability of numerical and relative data for the data of each case Any indicator or measure is included in the legal process

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Publication Date
Wed Dec 20 2023
Journal Name
Arab Science Heritage Journal
السقيان الدلاليان الادراكي و التعبيري في اسماء البضائع دراسةلسانية وصفية
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The research studies the semantic generation structures of
commodity names in the Baghdad dialect of Arabic, specifically
those names that reflect popular taste. Through descriptive field
studies of the social use of these words

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Publication Date
Tue Nov 13 2018
Journal Name
Arab Science Heritage Journal
اصناف أصناف النساء اللواتي وردَ لعنُهُنّ في الحديث النبويّ الشريف
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Praise be to God, who is by His Power, righteous is done, and by His help to slaves who He likes, and God bless our Prophet Muhammad envoy mercy to the worlds, and upon his family and the good mates until Doomsday.After:

The fact that cursing is the far distance and expulsion from the mercy of God, curse has been proven by him - peace be upon him - for the many varieties in the Sunnah, with indication of a permit cursing the insurgents from the people of Qibla, either saying - peace be upon him -: (the believer never be as a curser  ...), what is meant by those who do not deserve damnation of those not cursed God and His Messenger, and for this we must remove words cursing from the Dictionary of our words following the examp

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Publication Date
Sun Oct 14 2018
Journal Name
Arab Science Heritage Journal
جغرافية جغرافية العراق في الادبيات الاجنبية والعربية (دراسة تاريخية - تحليلية)
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تناول هذا البحث مراجعة لعدد من الكتب التي ألفت في جغرافية العراق العربية منها والإنكليزية، وتحديداً الكتب في العصر الحديث، إذ توصل البحث الى وجود مجموعة من الكتب التي تناولت مختلف جوانب العراق الطبيعية منها والبشرية، اتضح أن بعض الكتب الجغرافية تناولت الجانب الجغرافي الطبيعي فقط، في حين أن كتب أخرى تناولت الجانب الجغرافي البشري فقط. وأخرى جمعت بين الجغرافية الطبيعية والبشرية للعراق.

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Publication Date
Sun Nov 04 2018
Journal Name
Arab Science Heritage Journal
اثر أثر الدين في شخصية الملك أمنمحات الأول (1991-1961ق.م)
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The impact of religion in the character of the King Amenmhet I

1991-1961B.C.

This research try to show the  influence of the religion in the character of King Amenmhet I , he entered the names of the gods in the installation of  his names, because he aimed to  the trust of fellows  and to get the loyalty centers of worship, and deliberately enter the name of the god Amun in the composition of his name and make him  the first god of the state, which covered all the gods of Egypt, after the merge with each other, such as the gods Re became the god Amun - Re or after he inherited the functions of some of the other recipes such as what happened with the god Min

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