The optimal spacing between elliptic tubes cooled by free convection using constructal theory
Other Title(s)
البعد الأمثل ببن أنابيب بيضوية مبردة بالحمل الحر باستخدام نظرية التشييد
Joint Authors
Zahi, Jafar Ahmad
Mustafa, Ahmad Wahid
Source
al-Nahrain Journal for Engineering Sciences
Issue
Vol. 20, Issue 3 (30 Sep. 2017), pp.762-769, 8 p.
Publisher
Nahrain University College of Engineering
Publication Date
2017-09-30
Country of Publication
Iraq
No. of Pages
8
Main Subjects
Abstract EN
The optimal spacing between elliptic tubes cooled by free convection is studied numerically.
A row of isothermal elliptic tubes are installed in a fixed volume and the spacing between them is selected according to the constructal theory (Bejan's theory).
In this theory the spacing between the tubes is chosen such that the heat transfer density is maximized.
A finite volume method is employed to solve the governing equations; SIMPLE algorithm with collocated grid is utilized for coupling between velocity and pressure.
The range of Rayleigh number is (103 ≤ Ra ≤ 105 ), the range of the axis ratio of the tubes is (0 ≤ ε ≤ 0.5), and the working fluid is air (Pr =0.71).
The results show that the optimal spacing decreases as Rayleigh number increases for all axis ratios, and the maximum density of heat transfer increases as the Raleigh number increases for all axis ratios and the highest value occurs at axis ratio (ε =0) (flat plate) while the lowest value occurs at (ε =0.5) (circular tube).
The results also show that the optimal spacing is unchanged with the axis ratio at constant Rayleigh number.
American Psychological Association (APA)
Mustafa, Ahmad Wahid& Zahi, Jafar Ahmad. 2017. The optimal spacing between elliptic tubes cooled by free convection using constructal theory. al-Nahrain Journal for Engineering Sciences،Vol. 20, no. 3, pp.762-769.
https://search.emarefa.net/detail/BIM-849165
Modern Language Association (MLA)
Mustafa, Ahmad Wahid& Zahi, Jafar Ahmad. The optimal spacing between elliptic tubes cooled by free convection using constructal theory. al-Nahrain Journal for Engineering Sciences Vol. 20, no. 3 (2017), pp.762-769.
https://search.emarefa.net/detail/BIM-849165
American Medical Association (AMA)
Mustafa, Ahmad Wahid& Zahi, Jafar Ahmad. The optimal spacing between elliptic tubes cooled by free convection using constructal theory. al-Nahrain Journal for Engineering Sciences. 2017. Vol. 20, no. 3, pp.762-769.
https://search.emarefa.net/detail/BIM-849165
Data Type
Journal Articles
Language
English
Notes
Record ID
BIM-849165