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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
http://eprints.usm.my/48239/
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spelling my.usm.eprints.48239 http://eprints.usm.my/48239/ Parametric Study Of Microchannel Substrates For High Power Led Applications 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 NonPeerReviewed application/pdf en http://eprints.usm.my/48239/1/Parametric%20Study%20of%20Microchannel%20Substrates%20for%20High%20Power%20LED%20Applications-PhD-Dheepan%20Chakravarthii%20MK%20cut.pdf Kanagaraj, Dheepan Chakravarthii Musiri (2019) Parametric Study Of Microchannel Substrates For High Power Led Applications. PhD thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
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
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
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
http://eprints.usm.my/48239/
_version_ 1691733874457968640
score 13.211869

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