| 1. |
- Fan, Yi, et al.
(författare)
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A study of fluid coolant with carbon nanotube suspension for MicroChannel coolers
- 2008
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Ingår i: 2008 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2008; Pudong, Shanghai; China; 28 July 2008 through 31 July 2008. - 9781424427406
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Konferensbidrag (refereegranskat)abstract
- In this work, silicon microchannel coolers were made using the Deep Ion Reactive Etching (DIRE) technique. Stable and homogeneous Carbon NanoTube (CNT) suspension was also prepared. Meanwhile, a closed-loop cooling test system was developed to investigate the heat removal of the silicon microchannel cooler with different coolants. The experimental setup included a test module, a minipump for providing controllable flow, and a fan system for cooling the circular fluid. Beside the inlet and outlet of the test module, two thermocouples and pressure gauges were set up to measure the temperature and pressure of the fluids. The heat removal of the silicon microchannel cooler using different CNT volume fraction of suspension coolant was studied. The results show that the microchannel cooler with CNT suspension as coolant could strengthen the heat removal capability of microchannel cooler. In addition to heat transfer enhancement, the microchannel cooler with CNT suspension coolant did not produce extra pressure drop in the present study.
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| 2. |
- Hu, Zili, et al.
(författare)
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Vibration and buckling of a carbon nanotube inserted with a carbon chain
- 2008
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Ingår i: Proceedings, 2008 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2008. - 9781424427406
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Konferensbidrag (refereegranskat)abstract
- An elastic string-elastic shell model is developed to study vibration behaviors of a carbon nanowire. The present model predicts that non-coaxial vibration between the C-chain and the innermost tube does not occur due to negligible bending rigidity of the C-chain. In addition, it is found that the C-chain has most significant effect on the lowest frequency associated with radial vibration mode for circumferential wave-number 2 (n=2). In particular, the effect of the C-chain on axisymmetric radial breathing frequencies (n=0) predicted by the present model is found to be in reasonable agreement with known experimental and modeling results available in the literature. To study the buckling of a carbon nanowire made of the C-chain inserted inside a CNT, not only the elastic string-elastic shell model that used above but also the molecular dynamics (MD) simulation are adopted. For radial buckling, both continuum model and MD simulation predict that C-chain increases buckling stress by more than 40% to (2, 8), (0, 9), (3, 7) and (5, 5) tube. The continuum model predicts that circumferential wave number n=2 at buckling. Related with this, MD simulation shows that the cross-section of CNT is an ellipse at buckling. In particular, the nonlinear effects of vdW interaction have significant influence on the critical buckling loading. For the buckling under axial compression, two different kinds of buckling have been observed and investigated, namely the C-chain's unconditional buckling, and the tube's wall buckling, respectively. After the unconditional buckling, all displacements on the C-chain are in the same plane, and, the wave amplitudes' localization phenomenon appears. To the tube's wall buckling, the C-chain could either increase or decrease axial buckling strain depending on specific CNT chirality and temperature.
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| 3. |
- Xu, Li, et al.
(författare)
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Nano-Thermal Interface Material with CNT Nano-Particles For Heat Dissipation Application
- 2008
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Ingår i: 2008 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2008; Pudong, Shanghai; China; 28 July 2008 through 31 July 2008. - 9781424427406
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Konferensbidrag (refereegranskat)abstract
- Heat dissipation of electronic packages has become one of the limiting factors to miniaturization. The removal of the heat generated is a critical issue in electronic packaging. With the development of thermal management, thermal interface material (TIM) plays a more and more important role in electronics packaging. A new nano-TIM with nanofibers prepared by using electrospinning has been suggested in recent years. In this experiment study, the carbon nanotube (CNT) nano-particles were added into the polymer solution before the electrospinning to improve the thermal conductivity of nano-TIM. The polymer solution of Polyurethane was used for present electrospinning. The effects of a number of process parameters in the electrospinning were studied in this work. Different variables such as the distance between needle tip and collector, the voltage applied, and CNT nano-particles content were studied. The Scanning Electron Microscopy (SEM) was used to characterize nano-TIMs with CNT nano-particles.
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| 4. |
- Yue, Cong, et al.
(författare)
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Numerical Investigation on the Effect of Filler Distribution on Effective Thermal Conductivity of Thermal Interface Material
- 2008
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Ingår i: 2008 International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2008; Pudong, Shanghai; China; 28 July 2008 through 31 July 2008. - 9781424427406 ; , s. C1-10
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Konferensbidrag (refereegranskat)abstract
- Thermal interface materials have been widely adopted in the thermal management for electronics system. Most of the thermal interface materials are made of polymers with thermally conductive particles distributed inside to enhance the thermal conductivity. Thus it is essential to figure out the effective thermal conductivity of this composite material. In the present paper, a parameterized cubic cell model had been developed and implemented by the finite element method. The numerical simulations were carried out to investigate the effect of the filler distributions on the effective thermal conductivity of the thermal interface materials. The volume percentage loadings of the particles ranging from 13% to 74% had been considered, and different particle distribution patterns had also been analyzed. The simulation results were compared with the experimental data as well as other models. A fairly good agreement was obtained for the particle volume percentage loading under consideration, which verified the developed cubic cell model.
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