Measurement of thermal diffusivity of ethanol from (293 to 564) K and up to 10 MPa in vicinity of the critical point

Chen, Junshuai; Xing, Hongwei; Zhan, Taotao; Chen, Libin; He, Maogang; Zhang, Ying

doi:10.1016/j.fluid.2021.113276

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…Figure 11 shows the thermal diffusivity (black symbols) and θ th / E e (blue symbols) values of water–ethanol mixtures for different concentrations. Experimental data were taken from the paper of Capeloto et al 20 Thermal diffusivity values obtained from fitting the analytical [numerical ( eq 14 ), with ( eq 9 )] model are 1.43 × 10 –7 (1.42 × 10 –7 ) m 2 s –1 and 0.91 × 10 –7 (0.96 × 10 –7 ) m 2 s –1 for water 22 and ethanol, 19 , 28 , 29 respectively, being our results in good agreement with the literature values. The theoretical restrictions, discussed before, have been taken into account.…”

Section: Resultsmentioning

confidence: 99%

Analytical Model for Pulsed-Laser Induced Mode-Mismatched Dual-Beam Thermal Lens Spectroscopy in Liquids

et al. 2023

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Analytical models are very important to understand physical, chemical, and biological phenomena. In many cases, obtaining an analytical model is a complex, even an impossible task. In this work, an analytical model for thermal lens spectroscopy has been developed. The model considers light absorbing liquids, a laser pulsed beam as the heat source, timescale thermal regime, and small phase change produced by heating. A simplification for low-absorption samples is obtained. A complete theoretical study of their utilization is shown. Measurements of the thermal diffusivity of water–ethanol sample mixtures in the liquid phase are analyzed. These values for pure substances are in good agreement with those reported in the literature. Our methodology could be very useful in the analysis of the optical and thermal properties of liquids.

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Section: Resultsmentioning

confidence: 99%

Analytical Model for Pulsed-Laser Induced Mode-Mismatched Dual-Beam Thermal Lens Spectroscopy in Liquids

et al. 2023

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Time investigation and enhancement of the photothermal lens effect in the mode-matched configuration

et al. 2022

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Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

Koller,

Rausch,

Fröba

2024

Int J Thermophys

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The present article summarizes experimental and theoretical considerations required for a proper use of dynamic light scattering (DLS) for the measurement of transport properties of fluids. It addresses not only recent advancements of the method, but also aims to provide recommendations to researchers who intend to apply the technique in the future. As outlined in this study, DLS is based on the analysis of scattered light governed by microscopic statistical or periodic fluctuations that originate from the thermal movement of molecules and/or particles at macroscopic thermodynamic equilibrium. The dynamics of these hydrodynamic fluctuations in the bulk of fluids or at their phase boundaries are related to the underlying diffusive processes and, thus, to the associated transport properties, and are reflected by the time-dependent correlation function of the scattered light intensity. The fundamentals of this type of detection, known as photon correlation spectroscopy (PCS), will be discussed in the present contribution in some more detail. It is emphasized that the experiments need to be designed carefully in accordance with theory in order to assign the measurement signals to the corresponding hydrodynamic fluctuations. If the necessary conditions are fulfilled, DLS allows the accurate determination of several transport properties including kinematic and dynamic viscosity, thermal diffusivity, mutual diffusivity, and sound attenuation, which may be accessed together with other thermophysical properties such as speed of sound and surface or interfacial tension. In some instances, also the simultaneous determination of several transport properties is possible. With the exception of the sound attenuation, expanded uncertainties for the mentioned transport properties down to 1 % can be achieved for various types of fluid systems over a wide range of thermodynamic states up to elevated temperatures and pressures as well as in the vicinity of critical points. This performance and versatility of the DLS technique is documented in the present study by highlighting measurement examples from recent thermophysical property research on different classes of working fluids relevant for process and energy technology.

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Measurement of thermal diffusivity of ethanol from (293 to 564) K and up to 10 MPa in vicinity of the critical point

Cited by 7 publications

References 37 publications

Analytical Model for Pulsed-Laser Induced Mode-Mismatched Dual-Beam Thermal Lens Spectroscopy in Liquids

Analytical Model for Pulsed-Laser Induced Mode-Mismatched Dual-Beam Thermal Lens Spectroscopy in Liquids

Time investigation and enhancement of the photothermal lens effect in the mode-matched configuration

Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

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