Design and Performance a Variable Gap System for Thermal Conductivity Measurements of High Temperature, Corrosive, and Reactive Fluids

Gallagher, Ryan; Birri, Anthony; Russell, Nick; Ezell, N. Dianne Bull

doi:10.2139/ssrn.4017186

Cited by 2 publications

(3 citation statements)

References 89 publications

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“…These techniques are considered to be versatile and robust and, after a careful minimization of any heat leakages, the uncertainties can be <3% for the measurement of the thermal conductivity [4]. The variable-gap method is an attempt to mitigate the effects of convective and radiative losses by varying the distance between plates, especially important at high temperatures, but it uses the same steady-state working principle [5]. The transient hot wire is based on recording the temperature increase of a thin vertical metal wire when a voltage is applied to it [6,7], and it is simple, quick, precise, and accurate for most electrical insulating liquids [8].…”

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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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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“…Its strengths include versatility, accuracy, and the ability to capture dynamic changes in thermal conductivity [19]. The transient method uses a source that sends an electrical heat impulse to measure the response.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, steadystate techniques include coaxial cylinder and parallel plate (or axial flow) methods. These techniques generally require large sample volumes relative to transient processes and have been hypothesized to be affected by convective and radiative errors [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of calcined dam mud on the thermal conductivity of binary and ternary self-compacting concrete mixtures using the equivalent mortar method

Sallai,

Bouhamou,

Marouf

et al. 2024

SEES

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Reducing energy consumption in concrete buildings requires cement-based structural materials that have low thermal conductivity. Moreover, low thermal conductivity is a crucial property of building materials used for thermal insulation to ensure the comfort of building occupants. The research evaluates the effect of using calcined mud (CM) and natural pozzolan (Pz) on the thermal conductivity of self-compacting concrete (SCC). To optimise SCC formulations, the equivalent concrete mortar method has been used. This communication mainly focuses on the equivalent self-compacting concrete mortars (ESCCMs). The current study consists of ten formulations: one control (based on Portland cement) and nine others containing binary and ternary systems of Portland cement, calcined mud, and natural pozzolan with 10%, 20%, and 30% replacement rates . The mixtures were prepared using tests of cement paste and equivalent mortar in a fresh state. Afterwards, they were assessed based on their compressive strength at 14, 28, 90, and 180 days and their thermal conductivity at 28 and 90 days in the hardened state. The self-compatibility, the thermal conductivity, and the mechanical performance results obtained by relevant tests on ESCCMs prove that the ternary systems (Portland cement, CM, and Pz) open up many techno-economic development avenues in SCC applications to be explored.

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Design and Performance a Variable Gap System for Thermal Conductivity Measurements of High Temperature, Corrosive, and Reactive Fluids

Cited by 2 publications

References 89 publications

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

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

Influence of calcined dam mud on the thermal conductivity of binary and ternary self-compacting concrete mixtures using the equivalent mortar method

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