Measurement of the thermal transport properties of liquids using the front-face flash method

Forero-Sandoval, I. Y.; Pech-May, Nelson W.; Alvarado‐Gil, J. J.

doi:10.1016/j.infrared.2018.07.009

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…The residuals obtained for the fitting of the parameters Q 0 ∕e s , b 21 = e f ∕e s and h p = h∕e s are smaller than 2 % , which indicates that retrieved values are highly accurate. The backing fluid was ethyleneglycol with a thermal effusivity of 858 Ws 1∕2 m −2 K −1 [32]. For times smaller than the diffusion one ( t < 0 = L 2 ∕( ) ), the logarithmic plot of the surface temperature evolution exhibits a slope m ≈ −0.5 , in agreement with previous reported works [29,39].…”

Section: Thermal Effusivitysupporting

confidence: 87%

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Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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Composites made up of microparticles embedded in a polymeric matrix have attracted increasing attention due to the possibility of tailoring their physical properties by adding the adequate quantity of fillers. As the concentration of these fillers increases, their connectivity changes drastically at a given threshold and therefore the electrical, thermal and optical properties of these composites are expected to exhibit a percolation effect. In this work, the thermal and electrical conductivities along with the emissivity of composites composed of carbonyl-iron microparticles randomly distributed in a polyester resin matrix are measured, for volume fractions ranging from 0 to 0.55. It is shown that both the thermal and electrical conductivities increase with the particles' concentration, such that their percolation threshold appears at volume fractions of 0.46 and 0.38, respectively. The emissivity, on the other hand, decreases as the fillers' concentration increases, such that it exhibits a substantial decay at a volume fraction of 0.41. The percolation threshold of the emissivity is thus higher than that of the thermal conductivity, but lower than the electrical conductivity one. This dispersion on the percolation concentration is justified by the different physical mechanisms required to activate the electrical, thermal, and optical responses of the considered composites. The obtained results thus show that the percolation phenomenon can efficiently be used to enhance or reduce the physical properties of particulate composites.

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Section: Thermal Effusivitysupporting

confidence: 87%

“…The sample is heated up by a flash lamp (Speedotron 206VF) working at 4.8 kJ per pulse. The pulse duration extends up to 20 ms with a temporal shape previously discussed [32]. An infrared (IR) filter is placed in front of the flash lamp to prevent that its IR radiation…”

Section: Thermal Propertiesmentioning

confidence: 99%

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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“…This is done numerically using the well-known Euler algorithm for both the heating and cooling stages. Further details about the implementation can be found in previous investigations. , The surface temperature evolution can be expressed as T ( p 1 , p 2 , p 3 ; z = 0, t ), where p 1 = Q 0 χ/ϵ, p 2 = L / D , and p 3 = h ′. Consequently, it involves three unknown parameters that can be obtained by fitting the inverse Laplace transform of eq to the measured surface temperature evolution.…”

Section: Methodsmentioning

confidence: 99%

“…Further details about the implementation can be found in previous investigations. 18,21 The surface temperature evolution can be expressed as T(p 1 , p 2 ,…”

Section: T Z S I S H Y S H S S H Y Smentioning

confidence: 99%

Evidence of a Thermal Diffusivity Gap in Sintered Li–Co–Sb–O Solid Solutions

et al. 2023

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In this work, the thermal properties of ternary Li3x Co7–4x Sb2+x O12 solid solutions are studied for different concentrations in the range 0 ≤ x ≤ 0.7. Samples are elaborated at four different sintering temperatures: 1100, 1150, 1200 and 1250 °C. The effect of increasing the content of Li+ and Sb5+, accompanied by the reduction of Co2+, on the thermal properties is studied. It is shown that a thermal diffusivity gap, which is more pronounced for low values of x, can be triggered at a certain threshold sintering temperature (around 1150 °C in this study). This effect is explained by the increase of contact area between adjacent grains. Nevertheless, this effect is found to be less pronounced in the thermal conductivity. Moreover, a new framework for heat diffusion in solids is presented that establishes that both the heat flux and the thermal energy (or heat) satisfy a diffusion equation and therefore highlights the importance of thermal diffusivity in transient heat conduction phenomena.

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“…Among, the unsteady electrothermal methods, the transient hot wire (THW) becomes one of commonly used techniques for the measurement of the thermal conductivity of liquids [8,17]. In its standard configuration, a thin metal wire introduced in a liquid sample, acts as a resistive heat source and a thermometer.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Measurements of Liquids with Transient Hot-Bridge Method

Albouchi¹,

Mzali²,

Saadaoui³

et al. 2019

I2M

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In this paper an electro-thermal method is used for measuring the thermal conductivity of liquids. This technique is based on eight heat sensing resistors which are connected to form a Wheatstone bridge. Measurements performed on several liquids covering a wide range of thermal properties validate the method. The total standard uncertainty of the experimental results was estimated to be less than 3.8 %. Good agreement is found between the measured values of the thermal properties and previously reported values in literature. Moreover, measurements using this method are less time consuming than using the classical methods. This technique may find practical application for the thermal characterization of complex fluids even when applying external electric or magnetic fields.

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Measurement of the thermal transport properties of liquids using the front-face flash method

Cited by 4 publications

References 27 publications

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Evidence of a Thermal Diffusivity Gap in Sintered Li–Co–Sb–O Solid Solutions

Thermal Conductivity Measurements of Liquids with Transient Hot-Bridge Method

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