Copper Coated Carbon Nanotube Wick Wetted with Ultrahigh Temperature Ceramic Nanofluid and Silver Nanofluid in Heat Pipes with Enhanced Stability

2014 ◽  
Vol 592-594 ◽  
pp. 906-911
Author(s):  
C. Smilin John Thas ◽  
S. Mukesh Ram Gautham
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Fluid Mixture ◽  
Nano Fluid ◽  
Micro Patterning ◽  
Significant Performance ◽  
Carbon Nano Tubes ◽  
Ultrahigh Temperature ◽  
The Stability ◽  
Temperature Applications

. High thermal conductivity of copper and carbon nano tubes are used in variety of thermal management applications to improve cooling performance. Deposition of copper over these nanotubes increases the hydrophilic wicking surface and increased conductivity and stiffness. The CNT coating and micro patterning are able to provide significant performance enhancements by reducing the surface superheat up to 72% . Conductivity can be increased further by wetting the wicks with conductive fluids. The nanofluids are of great use in this area. Ceramic nanofluid has a very good stability and silver nanofluid has a very good thermal conductivity and hence their mixture is of great use in high temperature applications. Adding of ceramics also ensure the stability of nanofluid suspensions and prevent coagulation. This paper suggests wetting the wicks with ceramic and silver nano fluid mixture in the ratio of 1:5 to increase conductivity and stability for high temperature applications further.

Analysis and modeling of the pore size effect on the thermal conductivity of alumina foams for high temperature applications

2017 ◽  
Vol 43 (16) ◽  
pp. 13356-13363 ◽  
Author(s):  
Pedro I.B.G.B. Pelissari ◽  
Ricardo A. Angélico ◽  
Vânia R. Salvini ◽  
Diogo O. Vivaldini ◽  
Victor C. Pandolfelli
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Size Effect ◽  
Pore Size ◽  
Temperature Applications

Thermal conductivity and thermal expansion of Ir3X (X = Ti, Zr, Hf, V, Nb, Ta) compounds for high-temperature applications

2003 ◽  
Vol 80 (2) ◽  
pp. 385-390 ◽  
Author(s):  
Yoshihiro Terada ◽  
Kenji Ohkubo ◽  
Seiji Miura ◽  
Juan M Sanchez ◽  
Tetsuo Mohri
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Temperature Applications

Characteristics of Gold Wire Bonds with Ti- and Ni-Based Contact Metallization to n-SiC for High Temperature Applications

2010 ◽  
Vol 645-648 ◽  
pp. 745-748 ◽  
Author(s):  
M. Guziewicz ◽  
Ryszard Kisiel ◽  
Krystyna Gołaszewska ◽  
Marek Wzorek ◽  
Anna Stonert ◽  
...  
Keyword(s):  
High Temperature ◽  
Ohmic Contacts ◽  
Gold Wire ◽  
Electrical Parameters ◽  
Contact Metallization ◽  
Wire Bonds ◽  
Morphology And Structure ◽  
The Stability ◽  
Temperature Applications

The stability of Au wire connections to n-SiC/Ti ohmic contacts and to n-SiC/Ni ohmic contacts with top Au or Pt layers has been investigated. Long-term tests of the connections are performed in air at 400oC. Evaluation of electrical parameters, morphology and structure of the metallization as well as the strength of Au joint show stable Au wire bonds to the metallization with Ti-ohmic contacts.

Shark-skin inspired surface engineering on intermetallic titanium aluminides for high temperature applications using the fluorine effect

2011 ◽  
Vol 1295 ◽  
Author(s):  
Raluca Pflumm ◽  
Michael Schütze
Keyword(s):  
High Temperature ◽  
Surface Engineering ◽  
Titanium Aluminides ◽  
Single Digit ◽  
New Developments ◽  
Shark Skin ◽  
The Stability ◽  
Micro Structures ◽  
Temperature Applications

ABSTRACTIncreasing demands on technical components for high-temperature applications (e.g. tur-bine blades) promote new developments not only in the field of alloy design, but also in surface engineering. This paper shows that it is possible to structure the surface of intermetallic titanium aluminides in-situ by locally controlled oxidation of the material due to selective doping with fluorine. The aim is to reproduce a shark-skin pattern (parallel riblets with valleys in between) in order to improve the surface aerodynamics. Riblets with widths in the single digit μm range have been generated. The nucleation process, the aspect ratio and the stability of the generated micro-structures are discussed as a function of the substrate composition and the oxidation conditions.

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