Guarded Parallel-Plate Instrument for the Determination of the Thermal Conductivity of Gases, Liquids, Solids, and Heterogeneous Systems

Bioucas F, Rausch MH, Koller TM, Fröba AP (2023)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2023

Journal

International Journal of Heat and Mass Transfer Elsevier

Book Volume: 212

Article Number: 124283

DOI: 10.1016/j.ijheatmasstransfer.2023.124283

Abstract

In the present study, a new version of a guarded parallel-plate instrument (GPPI) for the absolute determination of the thermal conductivity under steady-state conditions is presented. It is based on an existing concept of an automated instrument and includes several modifications with the aim of further improving the achievable accuracy and experimental uncertainty while reducing the measurement time. These modifications mainly include improvements to the guard system in the upper hot part, which lead to a further suppression of parasitic heat fluxes, and the integration of flow circulation systems for the active temperature control in the periphery of the instrument. By using relatively large values for the temperature difference between the heating and cooling plates and for the sample thickness, expanded (k = 2) measurement uncertainties between (2 and 3)% could typically be achieved for the thermal conductivity. For mean temperatures from (283 to 358) K and atmospheric pressure, the measurement results agree well with reference data for liquid water, toluene, and ethylene glycol as well as air, polytetrafluorethylene (PTFE), and stainless steel 316. In addition, the applicability of the new GPPI for the determination of the effective thermal conductivity of heterogeneous systems was demonstrated using water-based nanofluids containing dispersed silicon dioxide, titanium dioxide, or copper oxide nanoparticles.

Authors with CRIS profile

Francisco Bioucas Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Michael Rausch Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Thomas Manfred Koller Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Andreas Paul Fröba Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP)

Additional Organisation(s)

Erlangen Graduate School in Advanced Optical Technologies

Related research project(s)

Effektive Wärmeleitfähigkeit von Dispersionen mit einer flüssigen kontinuierlichen Phase Aug. 1, 2021 - July 31, 2024

How to cite

APA:

Bioucas, F., Rausch, M.H., Koller, T.M., & Fröba, A.P. (2023). Guarded Parallel-Plate Instrument for the Determination of the Thermal Conductivity of Gases, Liquids, Solids, and Heterogeneous Systems. International Journal of Heat and Mass Transfer, 212. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2023.124283

MLA:

Bioucas, Francisco, et al. "Guarded Parallel-Plate Instrument for the Determination of the Thermal Conductivity of Gases, Liquids, Solids, and Heterogeneous Systems." International Journal of Heat and Mass Transfer 212 (2023).

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