Cryogenic apparatus for study of near-field heat transfer

Králı́k, Tomáš; Hanzelka, P.; Musilová, Věra; Srnka, A.; Zobač, Martin

doi:10.1063/1.3585985

Cited by 51 publications

(38 citation statements)

References 12 publications

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“…More recently, Kralik et al 307 carried out near-field measurements between tungsten surfaces, each 35 mm 110 in diameter, with a separation distance between ~ 1 m to 1 mm. The hot-side surface was maintained between 10-100 K and cold side maintained at 5 K. They reported a three orders of magnitude increase in the emittance between the two surfaces.…”

Section: Near-field Radiationmentioning

confidence: 99%

Nanoscale heat transfer – from computation to experiment

Luo

Chen

2013

Phys. Chem. Chem. Phys.

249

208

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Heat transfer can differ distinctly at the nanoscale from that at the macroscale. Recent advancement in computational and experimental techniques has enabled a large number of interesting observations and 5 understanding of heat transfer processes at the nanoscale. In this review, we will first discuss recent advances in computational and experimental methods used in nanoscale thermal transport studies, followed by reviews of novel thermal transport phenomena at the nanoscale observed in both computational and experimental studies, and discussion on current understanding of these novel phenomena. Our perspectives on challenges and opportunities on computational and experimental 10 methods are also presented. IntroductionHeat transfer at the nanoscale can differ distinctly from that predicted by classical laws.1 Understanding nanoscale heat transfer will help thermal management of electronic, optical, and 15 optoelectronic devices, and design new materials with different thermal transport properties for energy conversion and utilization. Research on nanoscale heat transfer has advanced significantly over the past two decades, and a large number of interesting phenomena have been observed. 20The record-high thermal conductivities were computationally calculated (6600 W/mK at room temperature) 2 and experimentally measured (3500 W/mK at room temperature) 3 in a single-walled carbon nanotube (CNT), a one-dimensional system with thermal conductivity exceeding that of diamond -25 the best known heat conductor in bulk form. The thermal conductivities of CNTs are not only high but could also be diverging due to the one-dimensional nature of thermal transport. [4][5][6] Graphene 7 has also been reported to have exceptionally high thermal conductivity (5800 W/mK). Polymers, such as polyethylene, are usually regarded as thermal insulators in the amorphous phase (~0.3 W/mK). 9 However, simulations suggest that along a polyethylene molecular chain, thermal conductivity is high and could even be divergent.10 Ultradrawn polyethylene nanofibers are found to have thermal 35 conductivities (~100 W/mK) hundreds of times higher than their amorphous counterparts. 11 In fluids suspended with nanoparticles, thermal conductivity enhancement way beyond the amount predicted by traditional effective medium theory has been reported. 12,13 This observation has inspired a large amount of 40 research both theoretically and experimentally to explore the mechanism and applications of the enhanced thermal transport in nanofluids. [14][15][16][17][18][19] Theories have predicted that radiative heat transfer between objects separated at small distances increase significantly with decreasing separations, supported by a few 45 prior experiments performed at micrometer or larger separations. [20][21][22] Recent experiments have pushed the separations between surfaces to tens of nanometers, and radiative heat transfer many orders of magnitude higher than that predicted by Planck's blackbody radiation law has been reported. Besides the high and inc...

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Section: Near-field Radiationmentioning

confidence: 99%

Nanoscale heat transfer – from computation to experiment

Luo

Chen

2013

Phys. Chem. Chem. Phys.

249

208

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“…in near-field regime) the situation radically changes. Indeed, at this scale, evanescent photons which remain confined near the surface of materials are the main contributors to transfer and they participate via tunneling through the vacuum gap [1][2][3][4][5][6][7][8]. A significant heat-flux increase results from this transport.…”

Section: Introductionmentioning

confidence: 99%

Three-Body Amplification of Photon Heat Tunneling

2012

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Resonant tunneling of surface polaritons across a subwavelength vacuum gap between two polar or metallic bodies at different temperatures leads to an almost monochromatic heat transfer which can exceed by several orders of magnitude the far-field upper limit predicted by Planck's blackbody theory. However, despite its strong magnitude, this transfer is very far from the maximum theoretical limit predicted in near-field. Here we propose an amplifier for the photon heat tunneling based on a passive relay system intercalated between the two bodies, which is able to partially compensate the intrinsic exponential damping of energy transmission probability thanks to three-body interaction mechanisms. As an immediate corollary, we show that the exalted transfer observed in near-field between two media can be exported at larger separation distances using such a relay. Photon heat tunneling assisted by three-body interactions enables novel applications for thermal management at nanoscale, near-field energy conversion and infrared spectroscopy.

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“…Basu et al * simchi@alumni.iust.ac.ir have considered two semi-infinite plates separated by a vacuum gap of finite width, especially for 0.1 < d < 100 nm, and studied the dependency of maximum heat flux to the dielectric function and vacuum gap width [14]. In addition at subwavelength gap (i.e., in near field regime), it has been shown that, a significant increment of heat flux results from the evanescent photons which remain confined near the surface of the materials [15][16][17][18][19][20][21][22]. Messina et al, have considered a metal-like (ML) medium layer (with width, δ) between two silicon carbide (SiC) layers (with width, d) and studied the amplification of photon heat tunneling in this structure [23].…”

Section: Introductionmentioning

confidence: 99%

Graphene-based three-body amplification of photon heat tunneling

Simchi

2017

Journal of Applied Physics

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We consider a three slabs configuration including two non-doped single layer graphene on insulating silicon dioxide (G/SiO2) substrates and one non-doped suspended single layer graphene (SG). The suspended layer is placed between two G/SiO2 layers. Without SG layer, the heat flux has maximum at Plasmon frequency supported by the G/SiO2 slabs. In three slabs configuration, the photon heat tunneling is amplified between two G/SiO2 layers significantly, only for specific range of vacuum gap between SG layer and G/SiO2 layers and Plasmon frequency, due to the coupling of modes between each G/SiO2 layer and SG layer. Since, the SG layer is a single atomic layer, the photon heat tunneling assisted by this configuration does not depend on the thickness of middle layer and in consequence, it can enable novel applications for nanoscale thermal management.

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Cryogenic apparatus for study of near-field heat transfer

Cited by 51 publications

References 12 publications

Nanoscale heat transfer – from computation to experiment

Nanoscale heat transfer – from computation to experiment

Three-Body Amplification of Photon Heat Tunneling

Graphene-based three-body amplification of photon heat tunneling

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