Bench top Fourier transform infrared based instrument for simultaneously measuring surface spectral emittance and temperature

Markham, James R.; Kinsella, Karen; Carangelo, Robert M.; Brouillette, Carl; Carangelo, Martin D.; Best, P. E.; Solomon, P.R.

doi:10.1063/1.1143913

Cited by 62 publications

(29 citation statements)

References 8 publications

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“…Using optical methods, it is usually difficult to do absolute thermal conductivity measurements temperature rise at the surface causes either reflectance change, [197][198][199] emittance change, [200][201][202][203] absorptance change, 204 photoacoustic signal change, 205 thermal expansion on the sample surface or in the surrounding media. [206][207][208] Either the amplitude or phase signals can be used to extract thermal properties of thin 35 films and interfaces.…”

Section: 5 Optical Methodsmentioning

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: 5 Optical Methodsmentioning

confidence: 99%

Nanoscale heat transfer – from computation to experiment

Luo

Chen

2013

Phys. Chem. Chem. Phys.

249

208

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“…Finally, some emissivity data for Inconel 600, Inconel X and Haynes 230 are given in Refs. [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Emissivity measurements on aeronautical alloys

Campo

Pérez-Sáez

González-Fernández

et al. 2010

Journal of Alloys and Compounds

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“…The hemispherical reflectance has been measured by various techniques [7][8][9][10][11][12][13]. In the field of thermal engineering, the hemispherical reflectance has been measured mainly by an integrating sphere technique [7].…”

Section: Idea For New Spectrophotometer Systemmentioning

confidence: 99%

A New Spectrophotometer System for Measuring Hemispherical Reflectance and Normal Emittance of Real Surfaces Simultaneously

Makino

Wakabayashi

2010

Int J Thermophys

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A new spectrophotometer system is developed for the study of thermal radiation characteristics of real surfaces in thermal engineering environments. The system measures spectra of normal incidence hemispherical reflectance R NH and normal emittance ε N in the near-ultraviolet through infrared region of wavelength of 0.30 µm to 11 µm simultaneously and repeatedly with a cycle time of 4 s. The system enables evaluation of the normal incidence absorptance A N in this wide spectral region. Transitions of spectra of specular-finished and rough-finished nickel surfaces in a high-temperature air-oxidation process are measured to demonstrate the performance of the system. Clear interference behaviors are found even in the spectra of hemispherical reflectance R NH and emittance ε N of a rough-finished surface. List of symbolsA N Normal incidence absorptance n Index of refraction R HH Hemispherical reflectance for hemispherically homogeneous incidence R HN Normal reflectance for hemispherically homogeneous incidence R NH Normal incidence hemispherical reflectance R NN Normal incidence specular reflectance (specular reflection component of hemispherical reflectance R NH ) tTime after the start of heating specimen, s

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Bench top Fourier transform infrared based instrument for simultaneously measuring surface spectral emittance and temperature

Cited by 62 publications

References 8 publications

Nanoscale heat transfer – from computation to experiment

Nanoscale heat transfer – from computation to experiment

Emissivity measurements on aeronautical alloys

A New Spectrophotometer System for Measuring Hemispherical Reflectance and Normal Emittance of Real Surfaces Simultaneously

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