Hydraulic characteristics of flow over and under semi-cylindrical structure
Joint Authors
Jalil, Shakir Abd al-Latif
Qasim, Jihan Mahmud
Sarhan, Sarhan Abd al-Sattar
Source
Issue
Vol. 21, Issue 2 العلوم الصرفة و الهندسية (31 Dec. 2018), pp.45-58, 14 p.
Publisher
Publication Date
2018-12-31
Country of Publication
Iraq
No. of Pages
14
Main Subjects
Engineering & Technology Sciences (Multidisciplinary)
Abstract EN
In this study the germane factors influencing the flow over and under semi-cylindrical structure are experimentally investigated.
Four different diameters are tested, each one is operated with four different heights of gate opening to yield sixteen models.
For the purpose of comparison, a vertical rectangular thin-plate model is tested.
Performance of the semi-cylindrical structure proved to be significantly better than the rectangular model.
The laboratory investigations show that at low flow heads that just caused to start operating the weirs, the increase in gate opening from 2 to 5 cm caused an increase in total discharge about 80%, but it decreased to 3 % with an increase in head about 50%.
In addition, the effect of cylinder diameter decreased at relatively high heads for all gate openings when the ratio of head/gate-opening increased to 2.
The contribution of weir flow hinders gate flow causing its submergence and thus the head on the weir relatively increased at an average of 34 %.
The dimensionless parameters that cause increasing or decreasing the total dimensionless discharge are discussed.
The contribution of weir in the total actual discharge is between 7 % - 44 % and that of gate is between 56 % - 93 %, depending on gate opening and cylinder diameter.
Mathematical models are presented to predict the total discharge and the contribution of weir and gate with considerable accuracy.
American Psychological Association (APA)
Jalil, Shakir Abd al-Latif& Sarhan, Sarhan Abd al-Sattar& Qasim, Jihan Mahmud. 2018. Hydraulic characteristics of flow over and under semi-cylindrical structure. Journal of Dohuk University،Vol. 21, no. 2 العلوم الصرفة و الهندسية, pp.45-58.
https://search.emarefa.net/detail/BIM-898379
Modern Language Association (MLA)
Jalil, Shakir Abd al-Latif…[et al.]. Hydraulic characteristics of flow over and under semi-cylindrical structure. Journal of Dohuk University Vol. 21, no. 2 Pure and Engineering Sciences (2018), pp.45-58.
https://search.emarefa.net/detail/BIM-898379
American Medical Association (AMA)
Jalil, Shakir Abd al-Latif& Sarhan, Sarhan Abd al-Sattar& Qasim, Jihan Mahmud. Hydraulic characteristics of flow over and under semi-cylindrical structure. Journal of Dohuk University. 2018. Vol. 21, no. 2 العلوم الصرفة و الهندسية, pp.45-58.
https://search.emarefa.net/detail/BIM-898379
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 57-58
Record ID
BIM-898379