Measurement of the thermal conductivity of fluids using laser spot lock-in thermography

Bedoya, A.; Colom, Mateu; Mendioroz, A.; Salazar, A.; Marı́n, E.

doi:10.1016/j.measurement.2020.107740

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…What is more three complex fluid flow configurations were analysed and research shows that flow conditions are two dimensional [11]. In another work laser spot heating locked in infrared thermography was used to find the thermal conductivity of fluid [12]. In conclusion the proposed method gives fast, non-contact method with fine accuracy (uncertainty of about 5%) for measuring thermal conductivity in liquids and gasses as well.…”

Section: Introductionmentioning

confidence: 96%

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Thermovision analysis of heat and power plant chimneys technical condition

et al. 2022

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This paper describes the thermovision analysis conducted on two types of chimneys: structural steel one and reinforced concrete one located in Kielce Heat and Power Plant, Poland. As a result of the research temperature distribution obtained from the thermograms were shown on the diagrams and analysed along their horizontal direction. It proves, both of the chimneys that were examined are in proper technical condition. The article also discusses the importance of the analysis as a diagnostic tool that allows early-stage detection of structural technical conditions and thermal insulation degradation. A factory’s chimney should work constantly to maintain its operation, since modifications in the production line caused by construction works are high cost and usually difficult to implement. However, analyses are critical to ensure chimneys are well maintained. The literature presents many examples of destructive influence of high temperature on the reinforced concrete chimneys. When failure of chimneys occurs, even the whole plant unit may be closed down. Thermography is then an ideal, non-destructive and cost-effective instrument for structure testing and can therefore be a useful, initial step to locate potential damage.

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Section: Introductionmentioning

confidence: 96%

“…In conclusion the proposed method gives fast, non-contact method with fine accuracy (uncertainty of about 5%) for measuring thermal conductivity in liquids and gasses as well. It gives wide range of advantages comparing to conventional techniques for thermal characterization [12].…”

Section: Introductionmentioning

confidence: 99%

Thermovision analysis of heat and power plant chimneys technical condition

et al. 2022

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“…The laser flash technique measures the thermal diffusivity in a small amount of liquid, effectively eliminating convection effects, but it requires a specially constructed enclosure that increases its complexity [8]. Furthermore, a laser can also be used to determine the thermal conductivity of a liquid by measuring the interfacial thermal resistance [10]. However, this setup requires a thermal camera.…”

Section: Introductionmentioning

confidence: 99%

Determination of thermal conductivity, thermal diffusivity, and specific heat of liquids using a thermoelectric module

Mendiola-Curto,

Beltrán-Pitarch,

García-Cañadas

2024

Meas. Sci. Technol.

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Managing heat through working fluids is essential in many applications, as well as the development of new fluids with improved properties. Therefore, the characterization of their thermal properties, which is usually a laborious task, is necessary to design and model new thermal systems. In this study, we show the proof of concept of a new method capable of determining the thermal conductivity, thermal diffusivity, and specific heat capacity of liquids from a single simple measurement, provided their density is known (a property easy to measure). The method is based on the use of a thermoelectric module, which is soldered to a large copper block at one side (heat sink). At the other side, the liquid is added on top of the ceramic external layer of the module. By means of impedance spectroscopy measurements, it is demonstrated for three liquids (water, Luzar, and diethylene glycol) that their thermal properties of can be obtained. In order to do this, a new equivalent circuit was developed to account for the new boundary conditions of the measuring setup. Random and systematic errors were calculated and combined to obtain a total uncertainty <8.6% for the thermal conductivity, <6.3% for the thermal diffusivity, and <6.1% for the specific heat capacity. The reasonably low uncertainties obtained position the new method as a low-cost alternative able to provide the three key thermal properties of liquids from one single measurement and only using a single setup.

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