Quantification of Thermal Resistance of Transient-Liquid-Phase Bonded Cu/Al/Cu Interfaces for Assembly of Cu-Based Microchannel Heat Exchangers

2013 ◽  
Vol 1 (3) ◽  
Author(s):  
Bin Lu ◽  
Ke Chen ◽  
W. J. Meng ◽  
Amar Karki ◽  
Rongying Jin
Keyword(s):  
Heat Transfer ◽  
Liquid Phase ◽  
Thermal Resistance ◽  
Heat Exchangers ◽  
Transient Liquid Phase ◽  
Bonding Interface ◽  
Interfacial Thermal Resistance ◽  
Flash Method ◽  
Bonding Layer ◽  
Tlp Bonding

Transient liquid phase (TLP) bonding of Cu structures with a thin elemental Al intermediate bonding layer is being used to assemble Cu-based, enclosed, microchannel heat exchangers (MHEs). The heterogeneous Cu/Al/Cu TLP bonding interface region, formed during the TLP bonding process, impacts heat transfer of the assembled MHE device. To evaluate the thermal resistance of TLP bonded Cu/Al/Cu interface regions, transient flash measurements were performed across bonding interface regions formed under various conditions, in combination with detailed structural examination and measurements of bulk mass density and specific heat. The flash method is shown to yield quantitative measurements of interfacial thermal resistance values. Our results provide guidance to developing bonding protocols for Cu-based MHEs with optimized heat transfer performance.

Transient liquid phase (TLP) bonding of TiAl/Ti6242 with Ti–Cu foil

2004 ◽  
Vol 9 (6) ◽  
pp. 525-531 ◽  
Author(s):  
H. Duan ◽  
M. Koçak ◽  
K.-H. Bohm ◽  
V. Ventzke
Keyword(s):  
Liquid Phase ◽  
Transient Liquid Phase ◽  
Tlp Bonding ◽  
Cu Foil

Investigation of Interfacial Thermal Resistance on Nano-Structures Using Molecular Dynamics Simulations

2010 ◽  
Author(s):  
Navdeep Singh ◽  
Debjyoti Banerjee
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Thermal Resistance ◽  
Md Simulations ◽  
Interfacial Thermal Resistance ◽  
Filler Materials ◽  
Nano Structures ◽  
Dynamics Simulations ◽  
Very High

Due to their very high thermal conductivity carbon nanotubes have been found to be an excellent material for thermal management. Experiments have shown that the heaters coated with carbon nanotubes increase the heat transfer by as much as 60%. Also when nanotubes are used as filler materials in composites, they tend to increase the thermal conductivity of the composites. But the increase in the heat transfer and the thermal conductivity has been found to be much less than the calculated values. This decrease has been attributed to the interfacial thermal resistance between the carbon nanotubes and the surrounding material. MD simulations were performed to study the interfacial thermal resistance between the carbon nanotubes and the liquid molecules. In the simulations, the nanotube is placed at the center of the simulation box and a temperature of 300K is imposed on the system. Then the temperature of the nanotube is raised instantaneously and the system is allowed to relax. From the temperature decay, the interfacial thermal resistance between the carbon nanotube and the liquid molecules is calculated. In this study the liquid molecules under investigation are n-heptane, n-tridecane and n-nonadecane.

Transient liquid phase (TLP) bonding of Al7075 to Ti–6Al–4V alloy

2010 ◽  
Vol 61 (3) ◽  
pp. 312-317 ◽  
Author(s):  
A. AlHazaa ◽  
T.I. Khan ◽  
I. Haq
Keyword(s):  
Liquid Phase ◽  
Transient Liquid Phase ◽  
Tlp Bonding

Ultrarapid Transient-Liquid-Phase Bonding of Advanced Ceramics

2010 ◽  
Vol 64 ◽  
pp. 88-97 ◽  
Author(s):  
Sung M. Hong ◽  
Christopher C. Bartlow ◽  
Thomas B. Reynolds ◽  
Noritaka Saito ◽  
Andreas M. Glaeser
Keyword(s):  
Liquid Phase ◽  
Transient Liquid Phase ◽  
Transient Liquid Phase Bonding ◽  
Processing Conditions ◽  
Advanced Ceramics ◽  
Tlp Bonding ◽  
Ultrahigh Temperature

Interlayer designs and processing conditions that promote rapid and reliable transientliquid- phase (TLP) bonding/joining of Al2O3 and ZrO2-toughened Al2O3 ceramics are presented. The interplay between wetting, roughness, interlayer design and microstructure, and interlayer homogenization is described. The prospects for extending the method to other ceramics, notably the ultrahigh-temperature ceramics (UHTCs) will be discussed.

Thermal Assessment of Forced Convection Through Metal Foam Heat Exchangers

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
A. Tamayol ◽  
K. Hooman
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Forced Convection ◽  
Heat Transfer Rate ◽  
Heat Exchangers ◽  
Transfer Rate ◽  
Metal Foam ◽  
Convection Heat Transfer ◽  
Geometrical Parameters ◽  
Convection Heat

Using a thermal resistance approach, forced convection heat transfer through metal foam heat exchangers is studied theoretically. The complex microstructure of metal foams is modeled as a matrix of interconnected solid ligaments forming simple cubic arrays of cylinders. The geometrical parameters are evaluated from existing correlations in the literature with the exception of ligament diameter which is calculated from a compact relationship offered in the present study. The proposed, simple but accurate, thermal resistance model considers: the conduction inside the solid ligaments, the interfacial convection heat transfer, and convection heat transfer to (or from) the solid bounding walls. The present model makes it possible to conduct a parametric study. Based on the generated results, it is observed that the heat transfer rate from the heated plate has a direct relationship with the foam pore per inch (PPI) and solidity. Furthermore, it is noted that increasing the height of the metal foam layer augments the overall heat transfer rate; however, the increment is not linear. Results obtained from the proposed model were successfully compared with experimental data found in the literature for rectangular and tubular metal foam heat exchangers.

Transient Liquid Phase Bonding of High Strength Low Alloy Steel Coiled Tubing

2010 ◽  
Vol 442 ◽  
pp. 66-73 ◽  
Author(s):  
A. Javadzadeh ◽  
T.I. Khan
Keyword(s):  
Liquid Phase ◽  
Hsla Steel ◽  
Bonding Temperature ◽  
Transient Liquid Phase ◽  
High Strength ◽  
Oil And Gas Industry ◽  
Tube Steel ◽  
Joint Region ◽  
Coiled Tubing ◽  
Tlp Bonding

The oil and gas industry of Alberta, Canada use coiled tubing made from high strength low alloyed steel (HSLA) to extract oil from reservoirs deep beneath the earth’s surface. The repeated use of the coiled tubing in down-hole wells results in fatigue failure of the tube material. In order to repair the coiled tube, a section of tubing is fusion welded using tungsten inert gas welding onto the remaining tube steel. However, the fusion weld often fails within the weld region and therefore, alternative joining methods need to be explored to minimize detrimental changes at the joint region. In this study transient liquid phase (TLP) bonding is used with the aid of metal interlayers based on the Ag-Cu and Ni-P systems. These interlayers form a liquid at the melting point and the gradual diffusion of alloying elements into the joint and the diffusion of elements out of the joint region induces isothermal solidification whilst the joint is held at the bonding temperature. The TLP bonding behaviour of the HSLA steel as a function of bonding parameters was investigated and the quality of the joint region determined using metallurgical techniques (light and scanning electron microscopy, energy dispersive spectroscopy) and mechanical testing.

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