An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder
An experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus...
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| Format: | Article |
| Language: | English |
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Polskie Towarzystwo Diagnostyki Technicznej
2023-05-01
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| Series: | Diagnostyka |
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| Online Access: | http://www.diagnostyka.net.pl/An-experimental-study-of-forced-vibration-on-natural-convection-between-closed-ended,165931,0,2.html |
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| author | Baydaa K. Khalil Adel Mohummad Saleh Ali L. Ekaid |
| author_facet | Baydaa K. Khalil Adel Mohummad Saleh Ali L. Ekaid |
| author_sort | Baydaa K. Khalil |
| collection | DOAJ |
| description | An experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus produced between two concentric and vertically eccentric circular cylinders is positioned horizontally, and its internal wall is uniformly heated while isothermally cooling the external wall. The range of present conditions for Rayleigh number is 5×〖10〗^4≤Ra≤6.48×〖10〗^6 , and Pr= 0.703, the frequency of vibration is 0f 20Hz; and the amplitude is b mm), with possible exclusion of the highest positive and negative eccentricities. Plots of the average Nusselt number variation against the Rayleigh number showed a significant increase in negative vertical eccentricity. It was found that the average Nusselt decreased as the internal cylinder changed its location vertically from negative to positive through the center, which is normally a desirable effect, but has no advantage over the concentric on the positive side. However, an increase in the Rayleigh number leads to a nearly proportional increase in the average Nusselt number and a smaller yet still substantial increase in positive eccentricity. |
| first_indexed | 2024-03-12T14:38:58Z |
| format | Article |
| id | doaj.art-4087339433534797861f91080774a804 |
| institution | Directory Open Access Journal |
| issn | 2449-5220 |
| language | English |
| last_indexed | 2024-03-12T14:38:58Z |
| publishDate | 2023-05-01 |
| publisher | Polskie Towarzystwo Diagnostyki Technicznej |
| record_format | Article |
| series | Diagnostyka |
| spelling | doaj.art-4087339433534797861f91080774a8042023-08-16T14:14:38ZengPolskie Towarzystwo Diagnostyki TechnicznejDiagnostyka2449-52202023-05-0124211310.29354/diag/165931165931An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinderBaydaa K. Khalil0Adel Mohummad Saleh1Ali L. Ekaid2university of technologyThe University of technology/ BaghdadUniversity of Technology- IraqAn experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus produced between two concentric and vertically eccentric circular cylinders is positioned horizontally, and its internal wall is uniformly heated while isothermally cooling the external wall. The range of present conditions for Rayleigh number is 5×〖10〗^4≤Ra≤6.48×〖10〗^6 , and Pr= 0.703, the frequency of vibration is 0f 20Hz; and the amplitude is b mm), with possible exclusion of the highest positive and negative eccentricities. Plots of the average Nusselt number variation against the Rayleigh number showed a significant increase in negative vertical eccentricity. It was found that the average Nusselt decreased as the internal cylinder changed its location vertically from negative to positive through the center, which is normally a desirable effect, but has no advantage over the concentric on the positive side. However, an increase in the Rayleigh number leads to a nearly proportional increase in the average Nusselt number and a smaller yet still substantial increase in positive eccentricity.http://www.diagnostyka.net.pl/An-experimental-study-of-forced-vibration-on-natural-convection-between-closed-ended,165931,0,2.htmlconcentriccylindrical annulusvertically eccentricvibration inner cylinder |
| spellingShingle | Baydaa K. Khalil Adel Mohummad Saleh Ali L. Ekaid An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder Diagnostyka concentric cylindrical annulus vertically eccentric vibration inner cylinder |
| title | An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| title_full | An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| title_fullStr | An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| title_full_unstemmed | An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| title_short | An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| title_sort | experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder |
| topic | concentric cylindrical annulus vertically eccentric vibration inner cylinder |
| url | http://www.diagnostyka.net.pl/An-experimental-study-of-forced-vibration-on-natural-convection-between-closed-ended,165931,0,2.html |
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