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
Online Access:	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
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spelling	my-uthm-ep.14292021-10-03T07:19:04Z Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse 2014-07 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 http://eprints.uthm.edu.my/1429/ http://eprints.uthm.edu.my/1429/1/24p%20AHMAD%20AZLAN%20HAMZAH.pdf text en public http://eprints.uthm.edu.my/1429/2/AHMAD%20AZLAN%20HAMZAH%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/1429/3/AHMAD%20AZLAN%20HAMZAH%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK Electrical engineering Electronics Nuclear engineering TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering TK Electrical engineering Electronics Nuclear engineering 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
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
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
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
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
_version_	1747830787601858560

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

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