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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
Tue Jan 01 2019
Journal Name
Journal Of The College Of Languages (jcl)
To Shape a Silence While Breaking it: Toni Morrison’s the Bluest Eye
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Toni Morrison (1931-), the first African-American winner of Noble Prize in literature (1993) and the winner of the 1988 Pulitzer Prize for fiction, regards herself as the historian of African-American people. She does not think of her writings as literature but as a sacred book dedicated to explore the interior lives of blacks. She creates history by disregarding European standards and the white man's view of African- Americans. She adopts her people's point of view, invests their heritage, voices their pains and uses their vernacular. She even writes to a black audience. She establishes the black novel  by depicting the blackness of American literature. In choos

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Publication Date
Fri Nov 21 2025
Journal Name
Tikrit Journal Of Administration And Economics Sciences
دور تكلفة الانتاج الانظف في تحقيق الميزة التنافسية المستدامة
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يهدف البحث إلىبيان دور الانتاج الانظف وتأثير تطبيقه على تكاليف الوحدة الاقتصادية وادواته وتقنياته التي تساهم في دعم الميزة التنافسية المستدامة

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Publication Date
Tue Sep 27 2022
Journal Name
Arab Science Heritage Journal
اهمية المنهج القرآني في تخطيط المعالم العلمية للشخصية الاسلامية
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Human wealth is the most valuable wealth on the face of the earth, and building the intellectual, cultural and scientific human being is the greatest process carried out by all religions and philosophies at all times, and the divine law aimed at reforming the earth, including in order to preserve this great wealth, and to preserve its existential and qualitative entity.

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Publication Date
Sun Mar 01 2009
Journal Name
Journal Of Economics And Administrative Sciences
Use the method of parsing anomalous valueIn estimating the character parameter
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In this paper the method of singular value decomposition  is used to estimate the ridge parameter of ridge regression estimator which is an alternative to ordinary least squares estimator when the general linear regression model suffer from near multicollinearity.

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Publication Date
Fri Dec 01 2023
Journal Name
قضايا سياسية
الوعي الطبقي في الفكر السياسي الماركسي الحديث( نماذج مختارة)
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مثل الوعي الطبقي اعلى مراحله لدى الفكر الماركسي الحديث عند كل من ماركس وانجلز ولينين ليس مجرد انعكاس للواقع وانما يكون بصورة جدلية من خلال انعكاس الوعي على الواقع واعادة انتاجه فبعد ان كان الوعي هو نتاج تطور الواقع اصبح اداة في تطوير الواقع، أي تأثير البنى الفوقية على البنى التحتية( المادية التاريخية) بعكس ما دعى اليه ماركس، اذ أعطى لينين للوعي دوراً كبيرا في التطور التاريخي، وعد الوعي الطبقي هو الاداة التي

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Publication Date
Wed Jun 19 2019
Journal Name
Journal Of Accounting And Financial Studies ( Jafs )
Efficient of Government Organization to attain the Ten Recommendation of social Responsibility
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   In this study, the researcher aimed to define and measure the relevance and effect of the governmental organizations in complying with Iraqi Ministry of Transportation's requirements towards achieving the social responsibility, embodied in the ten commandments of the United Nations Findings displayed the availability of realization regarding organization managers towards social responsibility with their various capabilities and tendencies in relation with the representing entries of those Ten Commandments.The study showed the relation between the effectiveness of those organizations and dimensions of the ten commandments of social responsibility, with the existence of a significant effect for the said effectiveness on achiev

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Publication Date
Fri Feb 08 2019
Journal Name
Journal Of The College Of Education For Women
تَنویرُ الذَّاتِ بالمنتَخبَاتِ من مَسائِل النحوِ في سُورةِ المرسَلاتِ
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That grammatical studies, a phenomenon of the Arabic language,
enabling the researcher during his research of the development of sentences,
textual analysis, to be the result of that meaning semantic of a sentence, and
the statement of the function the individual, in terms of its meaning in
context, and a link to the meaning lexical give indications of the current
single, and correlation analysis II , in terms of significance with the current
status syntactic to that individual, and these of the most important features of
grammatical studies of modern, based on the relationship structure sense, and
the relationship of the meaning of the structure, we looked for Aiklo for such
a study, Koran, all meanings and co

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Publication Date
Wed Sep 29 2021
Journal Name
Al-khwarizmi Engineering Journal
Robust Computed Torque Control for Uncertain Robotic Manipulatorss
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This paper presents a robust control method for the trajectory control of the robotic manipulator. The standard Computed Torque Control (CTC) is an important method in the robotic control systems but its not robust to system uncertainty and external disturbance. The proposed method overcome the system uncertainty and external disturbance problems. In this paper, a robustification term has been added to the standard CTC. The stability of the proposed control method is approved by the Lyapunov stability theorem.  The performance of the presented controller is tested by MATLAB-Simulink environment and is compared with different control methods to illustrate its robustness and performance.

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Publication Date
Sat Jun 18 2022
Journal Name
Al-academy
التنوع الشكلي والتقني في زخارف صندوق ومشبك الحضرة الكاظمية
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تعد التنوعات الشكلية والتقنية الزخرفية بأنواعها (هندسية ،نباتية، نصية خطية) مرتكزا أساسيا في تصميم العديد من المنجزات الثابتة والمنقولة فاستخدامها في العتبات المقدسة الإسلامية أظهر قابليتها الإبداعية من خلال تصاميمها لما تتمتع به من تنوعات شكلية ذات سمة تزيينية تم تنظيمها على وفق تصميم يعبر عن العقائد الدينية الإسلامية والتقاليد الفنية الأصيلة الموظفة في صندوق ومشبك الحضرة الكاظمية بما يمثل
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Publication Date
Wed Mar 30 2022
Journal Name
Arab Science Heritage Journal
الري والإصلاح الزراعي في العراق (1-132هـ/ 622-750م)
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The organization and development of the irrigation system and agrarian reform in Iraq had an impact on the diversity of its methods and uses.

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