Natural convection immersion cooling with enhanced optical performance of light-emitting diode systems

Name: Natural convection immersion cooling with enhanced optical performance of light-emitting diode systems
Author: Tamdoğan, Enes, Arık, Mehmet

İsim	Natural convection immersion cooling with enhanced optical performance of light-emitting diode systems
Yazar	Tamdoğan, Enes, Arık, Mehmet
Basım Tarihi:	2015-10-15
Konu	Natural convection, Immersion cooling, Direct liquid cooling, CFD, Light extraction
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1528-9044
Kayıt Numarası	ad74dcec-ccce-41f4-aca7-aaf403abc1b9
Lokasyon	Mechanical Engineering
Tarih	2015-10-15
Notlar	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Örnek Metin	Electronics driven at high currents may experience local hot spots, which may cause thermal degradation or even catastrophic failures. This common problem occurs at light-emitting diode (LED) chips and it is not easily observed by end-users. Driving over 700 mA over a 1 mm2 chip is expected to generate local temperature gradients. In addition, bonding failures at manufacturing or during operation (cracks, delamination, etc.) may also lead to local hot spots. Therefore, possible hot spots over an LED chip have turned attention to direct cooling with dielectric liquids comprises the current study. Computational and experimental studies have been performed to understand the impact of conduction and alternatively convection with various dielectric fluids to abate local hot spots in a multichip LED light engine. To capture the local temperature distributions over the LED light engine with a dome in the domain especially over the LED chip; first, computational models have been built with a commercial computational fluid dynamics (CFD) software. Later, attention has been turned into experimental validation by using a multichip high brightness LED (HB LED) light engine. An optothermal evaluation has been made at single and multiphase heat transfer modes with dielectric fluids (LS5252, HFE7000, and silicone oil, etc.) to compare with a series of CFD models and experimental studies. While multiphase liquid-cooled LED system has a better cooling performance but lower optical extraction, single-phase liquid-cooled LED system has shown a reasonable thermal performance with a 15% enhancement at light extraction.
DOI	10.1115/1.4031480
Cilt	137

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Natural convection immersion cooling with enhanced optical performance of light-emitting diode systems

Yazar Tamdoğan, Enes, Arık, Mehmet

Basım Tarihi 2015-10-15

Konu Natural convection, Immersion cooling, Direct liquid cooling, CFD, Light extraction

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1528-9044

Kayıt Numarası ad74dcec-ccce-41f4-aca7-aaf403abc1b9

Lokasyon Mechanical Engineering

Tarih 2015-10-15

Notlar Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Örnek Metin Electronics driven at high currents may experience local hot spots, which may cause thermal degradation or even catastrophic failures. This common problem occurs at light-emitting diode (LED) chips and it is not easily observed by end-users. Driving over 700 mA over a 1 mm2 chip is expected to generate local temperature gradients. In addition, bonding failures at manufacturing or during operation (cracks, delamination, etc.) may also lead to local hot spots. Therefore, possible hot spots over an LED chip have turned attention to direct cooling with dielectric liquids comprises the current study. Computational and experimental studies have been performed to understand the impact of conduction and alternatively convection with various dielectric fluids to abate local hot spots in a multichip LED light engine. To capture the local temperature distributions over the LED light engine with a dome in the domain especially over the LED chip; first, computational models have been built with a commercial computational fluid dynamics (CFD) software. Later, attention has been turned into experimental validation by using a multichip high brightness LED (HB LED) light engine. An optothermal evaluation has been made at single and multiphase heat transfer modes with dielectric fluids (LS5252, HFE7000, and silicone oil, etc.) to compare with a series of CFD models and experimental studies. While multiphase liquid-cooled LED system has a better cooling performance but lower optical extraction, single-phase liquid-cooled LED system has shown a reasonable thermal performance with a 15% enhancement at light extraction.

DOI 10.1115/1.4031480

Cilt 137