Thermal Analysis of Edge Illumination Type LED Backlight with Heat Pipe

This paper reports on thermal characterization of edge illumination type LED backlight integrated with heat pipes. Heat pipe is integrated with the panel by phase change flattening and expanding process. Thermal capabilities, including the steady-state working temperature and the temperature uniformity along the panels with heat pipes and without heat pipes are compared and analyzed. Results show that the steady-state working temperature on the panel with heat pipes is 1~6°C lower than that on the panel without heat pipes under power range of 15W to 51W of the LED arrays. And the temperature uniformity along the panel with heat pipes is controlled within 2.0°C.

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Kinetic study of Mongolian coals by thermal analysis

Mongolian Journal of Chemistry ◽

10.5564/mjc.v18i44.933 ◽

2018 ◽

Vol 18 (44) ◽

pp. 20-23

Author(s):

Jargalmaa S ◽

Tsatsral G ◽

Battsetseg M ◽

Batkhishig D ◽

Ankhtuya A ◽

...

Keyword(s):

Thermal Analysis ◽

Thermal Characterization ◽

Low Rank ◽

Weight Changes ◽

Heating Rates ◽

Weight Losses ◽

Brown Coals ◽

Temperature Ranges ◽

Kinetics Of

Thermal analysis was used for the thermal characterization of the coal samples. The experiments were performed to study the pyrolysis and gasification kinetics of typical Mongolian brown coals. Low rank coals from Shivee ovoo, Ulaan ovoo, Aduun chuluun and Baganuur deposits have been investigated. Coal samples were heated in the thermogravimetric apparatus under argon at a temperature ranges of 25-1020ºC with heating rates of 10, 20, 30 and 40ºC/min. Thermogravimetry (TG) and derivative thermogravimetry (DTG) were performed to measure weight changes and rates of weight losses used for calculating the kinetic parameters. The activation energy (Ea) was calculated from the experimental results by using an Arrhenius type kinetic model.

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Steady-State Investigation of Vapor Deposited Micro Heat Pipe Arrays

Journal of Electronic Packaging ◽

10.1115/1.2792070 ◽

1995 ◽

Vol 117 (1) ◽

pp. 75-81 ◽

Cited By ~ 27

Author(s):

A. K. Mallik ◽

G. P. Peterson

Keyword(s):

Thermal Conductivity ◽

Steady State ◽

Surface Temperature ◽

Heat Pipe ◽

Effective Thermal Conductivity ◽

Heat Pipes ◽

Temperature Gradients ◽

Bottom Surface ◽

Micro Heat Pipe ◽

Micro Heat Pipes

An experimental investigation of vapor deposited micro heat pipe arrays was conducted using arrays of 34 and 66 micro heat pipes occupying 0.75 and 1.45 percent of the cross-sectional area, respectively. The performance of wafers containing the arrays was compared with that of a plain silicon wafer. All of the wafers had 8 × 8 mm thermofoil heaters located on the bottom surface to simulate the active devices in an actual application. The temperature distributions across the wafers were obtained using a Hughes Probeye TVS Infrared Thermal Imaging System and a standard VHS video recorder. For wafers containing arrays of 34 vapor deposited micro heat pipes, the steady-state experimental data indicated a reduction in the maximum surface temperature and temperature gradients of 24.4 and 27.4 percent, respectively, coupled with an improvement in the effective thermal conductivity of 41.7 percent. For wafers containing arrays of 66 vapor deposited micro heat pipes, the corresponding reductions in the surface temperature and temperature gradients were 29.0 and 41.7 percent, respectively, and the effective thermal conductivity increased 47.1 percent, for input heat fluxes of 4.70 W/cm2. The experimental results were compared with the results of a previously developed numerical model, which was shown to predict the temperature distribution with a high degree of accuracy, for wafers both with and without the heat pipe arrays.

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Raman-Based Steady-State Thermal Characterization of Multiwall Carbon Nanotube Bundle and Buckypaper

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2015.9641 ◽

2015 ◽

Vol 15 (4) ◽

pp. 3004-3010 ◽

Cited By ~ 7

Author(s):

Man Li ◽

Yanan Yue

Keyword(s):

Steady State ◽

Carbon Nanotube ◽

Thermal Characterization ◽

Multiwall Carbon Nanotube ◽

Nanotube Bundle ◽

Multiwall Carbon

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Production Stainless Gravitational Heat Pipes Filled with Distilled Water

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.832.184 ◽

2016 ◽

Vol 832 ◽

pp. 184-191 ◽

Cited By ~ 1

Author(s):

Marián Jobb ◽

Ľuboš Kosa ◽

Michal Holubčík ◽

Radovan Nosek

Keyword(s):

Heat Pipe ◽

Operating Temperature ◽

Heat Pipes ◽

Distilled Water ◽

Aisi 304 ◽

Working Temperature ◽

Essential Function ◽

Aisi 316 ◽

Process Measurements ◽

Pipe Manufacturing

This article deals with the performance of heat pipes, depending on the operating temperature and positions (operation angle). There is described the essential function of the heat pipe manufacturing process. Measurements were carried at an operating temperature of 40 °C to 90 °C. Stainless heat pipes were made of three kinds of materials AISI 304, AISI 310, AISI 316 and filled with a distilled water, up to 20% of the heat pipe inner volume. For each material was selected heat pipe with the best results. The heat pipes were measured at various angles of vertical inclination (0 ° - 90 °), at the working temperature 90 ° C. The performance was measured on the experimental device. Presented results show the progress of individual measurements and the effect of operating parameters on the performance of heat pipes.

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Amplification of the Thermocapillary Convection during Evapo-Condensation Cycle in Heat Pipes

Materials Science Forum ◽

10.4028/www.scientific.net/msf.553.209 ◽

2007 ◽

Vol 553 ◽

pp. 209-214

Author(s):

Rachid Bennacer ◽

Mohammed El Ganaoui

Keyword(s):

Thermal Analysis ◽

Numerical Model ◽

Heat Pipe ◽

Thermocapillary Convection ◽

Thermal Conditions ◽

Heat Pipes ◽

External Conditions ◽

Local Coupling

The control of a process dealing with heat pipe exploitation needs the thermal analysis of the evaporation-condensation cycle and noticeably the imposed external conditions (in instance modeling the heating). In this work a numerical model has been developed to describe the local coupling near the liquid/vapour interface. Simulations exhibits and quantify the response of the capillary motion to the thermal conditions.

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