Characterization of the thermal performance of high heat flux systems at the Laser Hardened Materials Evaluation Laboratory

1996 ◽  
Author(s):  
Michael L. Lander ◽  
John O. Bagford ◽  
Mark T. North ◽  
Robert J. Hull
Keyword(s):  
Heat Flux ◽  
Thermal Performance ◽  
High Heat ◽  
High Heat Flux

Development of Micro/Nano Engineered Wick-Based Passive Heat Spreaders for Thermal Management of High Power Electronic Devices

2011 ◽  
Author(s):  
David H. Altman ◽  
Joseph R. Wasniewski ◽  
Mark T. North ◽  
Sungwon S. Kim ◽  
Timothy S. Fisher
Keyword(s):  
Heat Flux ◽  
Thermal Resistance ◽  
Thermal Performance ◽  
High Heat ◽  
Test Facility ◽  
Great Promise ◽  
High Heat Flux ◽  
Vapor Chamber ◽  
Heat Spreader

Spreading of high-flux electronics heat is a critical part of any packaging design. This need is particularly profound in advanced devices where the dissipated heat fluxes have been driven well over 100W/cm2. To address this challenge, researchers at Raytheon, Thermacore and Purdue are engaged in the development and characterization of a low resistance, coefficient of thermal expansion (CTE)-matched multi-chip vapor chamber heat spreader, which utilizes capillary driven two-phase heat transport. The vapor chamber technology under development overcomes the limitations of state-of-the-art approaches by combining scaled-down sintered Cu powder and nanostructured materials in the vapor chamber wick to achieve low thermal resistance. Cu-coated vertically aligned carbon nanotubes is the nanostructure of choice in this development. Unique design and construction techniques are employed to achieve CTE-matching with a variety of device and packaging materials in a low-profile form-factor. This paper describes the materials, design, construction and characterization of these vapor chambers. Results from experiments conducted using a unique high-heat flux capable 1DSS test facility are presented, exploring the effects of various microscopic wick configurations, CNT-functionalizations and fluid charges on thermal performance. The impacts of evaporator wick patterning, CNT evaporator functionalization and CNT condenser functionalization on performance are assessed and compared to monolithic Cu wick configurations. Thermal performance is explained as a function of applied heat flux and temperature through the identification of dominant component thermal resistances and heat transfer mechanisms. Finally, thermal performance results are compared to an equivalent solid conductor heat spreader, demonstrating a >40% reduction in thermal resistance. These results indicate great promise for the use of such novel vapor chamber technology in thickness-constrained high heat flux device packaging applications.

scholarly journals Thermal Assessment of Nano-Particulate Graphene-Water/Ethylene Glycol (WEG 60:40) Nano-Suspension in a Compact Heat Exchanger

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1929 ◽  
Author(s):  
M. Sarafraz ◽  
Mohammad Safaei ◽  
Zhe Tian ◽  
Marjan Goodarzi ◽  
Enio Bandarra Filho ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Ethylene Glycol ◽  
Thermal Performance ◽  
Evaluation Criteria ◽  
High Heat ◽  
Operating Conditions ◽  
Working Fluid ◽  
High Heat Flux ◽  
Micro Channel

In the present study, we report the results of the experiments conducted on the convective heat transfer of graphene nano-platelets dispersed in water-ethylene glycol. The graphene nano-suspension was employed as a coolant inside a micro-channel and heat-transfer coefficient (HTC) and pressure drop (PD) values of the system were reported at different operating conditions. The results demonstrated that the use of graphene nano-platelets can potentially augment the thermal conductivity of the working fluid by 32.1% (at wt. % = 0.3 at 60 °C). Likewise, GNP nano-suspension promoted the Brownian motion and thermophoresis effect, such that for the tests conducted within the mass fractions of 0.1%–0.3%, the HTC of the system was improved. However, a trade-off was identified between the PD value and the HTC. By assessing the thermal performance evaluation criteria (TPEC) of the system, it was identified that the thermal performance of the system increased by 21% despite a 12.1% augmentation in the PD value. Furthermore, with an increment in the fluid flow and heat-flux applied to the micro-channel, the HTC was augmented, showing the potential of the nano-suspension to be utilized in high heat-flux thermal applications.

scholarly journals Experimental Study on Thermal Performance of a Bent Copper-Water Heat Pipe

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Shuangshuang Miao ◽  
Jiajia Sui ◽  
Yulong Zhang ◽  
Feng Yao ◽  
Xiangdong Liu
Keyword(s):  
Heat Flux ◽  
Heat Pipe ◽  
Critical Heat Flux ◽  
Working Conditions ◽  
Thermal Performance ◽  
Heat Input ◽  
High Heat ◽  
High Heat Flux ◽  
Electronic Components ◽  
Copper Water

Vapor-liquid phase change is regarded as an efficient cooling method for high-heat-flux electronic components. The copper-water bent heat pipes are particularly suited to the circumstances of confined space or misplaced heat and cold sources for high-heat-flux electronic components. In this paper, the steady and transient thermal performance of a bent copper-water heat pipe is studied based on a performance test system. The effects of cooling temperature, working conditions on the critical heat flux, and equivalent thermal conductivity have been examined and analyzed. Moreover, the influences of heat input and working conditions on the thermal response of a bent heat pipe have also been discussed. The results indicate that the critical heat flux is enhanced due to the increases in cooling temperature and the lengths of the evaporator and condenser. In addition, the critical heat flux is improved by extending the cooling length only when the operating temperature is higher than 50°C. The improvement on the equivalent thermal by increasing the heating length is more evident than that by increasing cooling length. It is also demonstrated by the experiment that the bent copper-water heat pipe can respond quickly to the variation of heat input and possesses superior transient heat transfer performance.

Thermal Performance Study of VPS-W Coatings on CuCrZr Under High Heat Flux

2007 ◽  
Vol 9 (3) ◽  
pp. 261-264 ◽  
Author(s):  
Chong Fali ◽  
Chen Junling ◽  
Li Jiangang ◽  
Zheng Xuebin ◽  
Ding Chuanxian
Keyword(s):  
Heat Flux ◽  
Thermal Performance ◽  
High Heat ◽  
High Heat Flux ◽  
Performance Study

Qualification and post-mortem characterization of tungsten mock-ups exposed to cyclic high heat flux loading

2013 ◽  
Vol 88 (9-10) ◽  
pp. 1858-1861 ◽  
Author(s):  
G. Pintsuk ◽  
I. Bobin-Vastra ◽  
S. Constans ◽  
P. Gavila ◽  
M. Rödig ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Heat ◽  
High Heat Flux ◽  
Post Mortem

Thermal performance and 3D analysis of advanced mechanically joined divertor plate for LHD under steady state high heat flux

2001 ◽  
Vol 56-57 ◽  
pp. 205-210 ◽  
Author(s):  
Y Kubota ◽  
N Noda ◽  
A Sagara ◽  
R Sakamoto ◽  
K Yamazaki ◽  
...  
Keyword(s):  
Heat Flux ◽  
Steady State ◽  
Thermal Performance ◽  
High Heat ◽  
High Heat Flux ◽  
3D Analysis ◽  
Divertor Plate

Characterization of CT Plasmas on a Magnetized Coaxial Plasma Gun Device and its Application to Pulse High Heat Flux Simulation Tests

2016 ◽  
Vol 136 (3) ◽  
pp. 147-154 ◽  
Author(s):  
Ikko Sakuma ◽  
Yusuke Kikuchi ◽  
Wataru Isono ◽  
Takumi Nakazono ◽  
Masato Nakane ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Heat ◽  
High Heat Flux ◽  
Plasma Gun

Heat Transfer Characterization of a High Heat Flux Oxy-Fuel Direct Power Extraction Combustor

2017 ◽  
Author(s):  
Luisa A. Cabrera ◽  
Jad Aboud ◽  
Manuel J. Hernandez ◽  
Brian Lovich ◽  
Ahsan R. Choudhuri ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
High Heat ◽  
High Heat Flux ◽  
Direct Power ◽  
Power Extraction
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