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Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse

Impinging jets are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods t...

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Main Author: Hamzah, Ahmad Azlan
Format: Thesis
Language:English
English
English
Published: 2014
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
Online Access:http://eprints.uthm.edu.my/1429/1/24p%20AHMAD%20AZLAN%20HAMZAH.pdf
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http://eprints.uthm.edu.my/1429/3/AHMAD%20AZLAN%20HAMZAH%20WATERMARK.pdf
http://eprints.uthm.edu.my/1429/
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spelling my.uthm.eprints.14292021-10-03T07:19:04Z http://eprints.uthm.edu.my/1429/ Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse Hamzah, Ahmad Azlan TK Electrical engineering. Electronics Nuclear engineering TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers Impinging jets are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods to predicting jet performance. The goals that have been achieved in the numerical results displayed are determine the influence of impingement jet characteristics on thermal and flow field on a curve surface, determine the variation of Nusselt numbers (NuD) along the curve surface in order to understand the heat transfer characteristics and study the effect of position (in the center, in the mid and in the end) and angle (α=90°, 60° and 30°) of jet impingement on curve surface, different Reynolds numbers (ReD) in range of (5000, 6000, 7000, 8000 and 9000). The program, which was extracted results it is (GAMBIT 2.4.6) and (FLUENT 6.3), simulation is (2-D) in submerged jet flow and the continuity, momentum and energy equations were solved by means of a finite volume method (FVM). This study covers the effect of different Reynolds numbers (ReD) on average Nusselt numbers (Nuavg) and local Nusselt numbers (NuD). From the result, the average Nusselt numbers (Nuavg) increased with the increase of Reynolds numbers (ReD) for all cases, in comparison between different positions (center, mid and end), of nozzle on curve surface at angle (α=90°) the maximum value of average Nusselt numbers (Nuavg=388.3) is found when the nozzle locate in the end followed by the mid position and smallest value of average Nusselt numbers (Nuavg=182.25) in the center of curve surface. In case of slant angle (α=60º) the maximum value of average Nusselt numbers (Nuavg=387.47) is found when the nozzle locate in the end followed by the mid position and smallest value of average Nusselt numbers (Nuavg=308.3) in the center of curve surface. 2014-07 Thesis NonPeerReviewed text en http://eprints.uthm.edu.my/1429/1/24p%20AHMAD%20AZLAN%20HAMZAH.pdf text en http://eprints.uthm.edu.my/1429/2/AHMAD%20AZLAN%20HAMZAH%20COPYRIGHT%20DECLARATION.pdf text en http://eprints.uthm.edu.my/1429/3/AHMAD%20AZLAN%20HAMZAH%20WATERMARK.pdf Hamzah, Ahmad Azlan (2014) Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse. Masters thesis, Universiti Tun Hussein Onn Malaysia.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
language English
English
English
topic TK Electrical engineering. Electronics Nuclear engineering
TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
Hamzah, Ahmad Azlan
Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
description Impinging jets are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods to predicting jet performance. The goals that have been achieved in the numerical results displayed are determine the influence of impingement jet characteristics on thermal and flow field on a curve surface, determine the variation of Nusselt numbers (NuD) along the curve surface in order to understand the heat transfer characteristics and study the effect of position (in the center, in the mid and in the end) and angle (α=90°, 60° and 30°) of jet impingement on curve surface, different Reynolds numbers (ReD) in range of (5000, 6000, 7000, 8000 and 9000). The program, which was extracted results it is (GAMBIT 2.4.6) and (FLUENT 6.3), simulation is (2-D) in submerged jet flow and the continuity, momentum and energy equations were solved by means of a finite volume method (FVM). This study covers the effect of different Reynolds numbers (ReD) on average Nusselt numbers (Nuavg) and local Nusselt numbers (NuD). From the result, the average Nusselt numbers (Nuavg) increased with the increase of Reynolds numbers (ReD) for all cases, in comparison between different positions (center, mid and end), of nozzle on curve surface at angle (α=90°) the maximum value of average Nusselt numbers (Nuavg=388.3) is found when the nozzle locate in the end followed by the mid position and smallest value of average Nusselt numbers (Nuavg=182.25) in the center of curve surface. In case of slant angle (α=60º) the maximum value of average Nusselt numbers (Nuavg=387.47) is found when the nozzle locate in the end followed by the mid position and smallest value of average Nusselt numbers (Nuavg=308.3) in the center of curve surface.
format Thesis
author Hamzah, Ahmad Azlan
author_facet Hamzah, Ahmad Azlan
author_sort Hamzah, Ahmad Azlan
title Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
title_short Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
title_full Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
title_fullStr Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
title_full_unstemmed Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
title_sort effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
publishDate 2014
url http://eprints.uthm.edu.my/1429/1/24p%20AHMAD%20AZLAN%20HAMZAH.pdf
http://eprints.uthm.edu.my/1429/2/AHMAD%20AZLAN%20HAMZAH%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/1429/3/AHMAD%20AZLAN%20HAMZAH%20WATERMARK.pdf
http://eprints.uthm.edu.my/1429/
_version_ 1738580858208518144
score 13.211869

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