Parametric Study Of Microchannel Substrates For High Power Led Applications

In this study, microchannel substrates with non-uniform cross-sections were investigated for thermal management in LEDs. Extensive characterizations were done numerically and experimentally for high power LED applications to employ the novel substrates with channels. From the comprehensive literatur...

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Main Author:	Kanagaraj, Dheepan Chakravarthii Musiri
Format:	Thesis
Language:	English
Published:	2019
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/48239/1/Parametric%20Study%20of%20Microchannel%20Substrates%20for%20High%20Power%20LED%20Applications-PhD-Dheepan%20Chakravarthii%20MK%20cut.pdf
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spelling	my-usm-ep.482392021-02-03T05:00:17Z Parametric Study Of Microchannel Substrates For High Power Led Applications 2019-08 Kanagaraj, Dheepan Chakravarthii Musiri QC1 Physics (General) In this study, microchannel substrates with non-uniform cross-sections were investigated for thermal management in LEDs. Extensive characterizations were done numerically and experimentally for high power LED applications to employ the novel substrates with channels. From the comprehensive literature review, converging-diverging and diverging-converging channels were focussed for this research due to certain advantages such as efficient secondary flow formation and mitigation of nucleation boiling. A detailed and constructive parametric study was conducted by CFD simulations to identify the thermal performance of substrates based on different geometrical parameters such as channel length, converge-diverge angles, hydraulic diameters (Dh) and aspect ratio (γ). Ideal secondary flow formation in CD20 and DC90 microchannels contributed for enhanced heat transfer performance. From the numerical results, the substrates with higher thermal performance were CD20 (L1=9mm, Dh=512μm, Wmax=3mm) and DC90 (L1=3.25mm, Dh=651μm, Wmax=3mm). The CD and DC channelled substrates were manufactured by micro milling process and the surface roughness were measured using AFM. A high-power LED was mounted on different CD and DC substrates and thermal transient characterizations were done using Thermal Transient Tester (T3Ster©). The critical thermal parameters such as thermal resistance and junction temperature were calculated from the structure functions and smoothed response curves. The influence of input current and ambient temperature on CD and DC substrates were elaborated to affirm the consistency in the thermal performance irrespective of its operating conditions. 2019-08 Thesis http://eprints.usm.my/48239/ http://eprints.usm.my/48239/1/Parametric%20Study%20of%20Microchannel%20Substrates%20for%20High%20Power%20LED%20Applications-PhD-Dheepan%20Chakravarthii%20MK%20cut.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Kanagaraj, Dheepan Chakravarthii Musiri Parametric Study Of Microchannel Substrates For High Power Led Applications
description	In this study, microchannel substrates with non-uniform cross-sections were investigated for thermal management in LEDs. Extensive characterizations were done numerically and experimentally for high power LED applications to employ the novel substrates with channels. From the comprehensive literature review, converging-diverging and diverging-converging channels were focussed for this research due to certain advantages such as efficient secondary flow formation and mitigation of nucleation boiling. A detailed and constructive parametric study was conducted by CFD simulations to identify the thermal performance of substrates based on different geometrical parameters such as channel length, converge-diverge angles, hydraulic diameters (Dh) and aspect ratio (γ). Ideal secondary flow formation in CD20 and DC90 microchannels contributed for enhanced heat transfer performance. From the numerical results, the substrates with higher thermal performance were CD20 (L1=9mm, Dh=512μm, Wmax=3mm) and DC90 (L1=3.25mm, Dh=651μm, Wmax=3mm). The CD and DC channelled substrates were manufactured by micro milling process and the surface roughness were measured using AFM. A high-power LED was mounted on different CD and DC substrates and thermal transient characterizations were done using Thermal Transient Tester (T3Ster©). The critical thermal parameters such as thermal resistance and junction temperature were calculated from the structure functions and smoothed response curves. The influence of input current and ambient temperature on CD and DC substrates were elaborated to affirm the consistency in the thermal performance irrespective of its operating conditions.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kanagaraj, Dheepan Chakravarthii Musiri
author_facet	Kanagaraj, Dheepan Chakravarthii Musiri
author_sort	Kanagaraj, Dheepan Chakravarthii Musiri
title	Parametric Study Of Microchannel Substrates For High Power Led Applications
title_short	Parametric Study Of Microchannel Substrates For High Power Led Applications
title_full	Parametric Study Of Microchannel Substrates For High Power Led Applications
title_fullStr	Parametric Study Of Microchannel Substrates For High Power Led Applications
title_full_unstemmed	Parametric Study Of Microchannel Substrates For High Power Led Applications
title_sort	parametric study of microchannel substrates for high power led applications
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Fizik
publishDate	2019
url	http://eprints.usm.my/48239/1/Parametric%20Study%20of%20Microchannel%20Substrates%20for%20High%20Power%20LED%20Applications-PhD-Dheepan%20Chakravarthii%20MK%20cut.pdf
_version_	1747821907457081344

Parametric Study Of Microchannel Substrates For High Power Led Applications

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