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16 results on '"Bovesecchi, Gianluigi"'

6. Probes for Contemporary Measurement of Thermal Conductivity, Thermal Diffusivity and Convection Heat Transfer

Author

Corasaniti, Sandra, Coppa, Paolo, Potenza, Michele, and Bovesecchi, Gianluigi

Abstract

Four probes for measurement of thermal conductivity, thermal diffusivity and convection heat transfer coefficient have been designed, built, and tested. In two of these probes (SP-1 and SP-2) three thermocouples were located at 25%, 50%, and 75% of the total length of 150 mm, while the third one (SP-3) has the three thermocouples at 10%, 50% and 90%. The fourth probe (DP-1) is double, to measure thermal diffusivity with the pulse method. First results show good performances of the devices when used to measure a reference material (glycerol). In fact, an accuracy of about ±5% was achieved both in thermal conductivity and thermal diffusivity measurements. Due to their size (length 150 mm, diameter 2 mm) the probes are especially suited to measure the thermophysical properties of bulk materials, as soils, composites, walls of buildings, etc. Convection can be studied thanks to the presence of three thermocouples, so also the boundary layer can be evaluated.

Published
2024
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10. Modeling and Measuring Thermodynamic and Transport Thermophysical Properties: A Review.

Author

D'Alessandro, Giampaolo, Potenza, Michele, Corasaniti, Sandra, Sfarra, Stefano, Coppa, Paolo, Bovesecchi, Gianluigi, and de Monte, Filippo

Subjects
THERMOPHYSICAL properties, THERMAL diffusivity, SPECIFIC heat, INVERSE problems, LEAST squares, THERMAL conductivity
Abstract

The present review describes the up-to-date state of the evaluation of thermophysical properties (TP) of materials with three different procedures: modeling (also including inverse problems), measurements and analytical methods (e.g., through computing from other properties). Methods to measure specific heat and thermal conductivity are described in detail. Thermal diffusivity and thermal effusivity are a combination of the previously cited properties, but also for these properties, specific measurement and calculation methods are reported. Experiments can be carried out in steady-state, transient, and pulse regimes. For modeling, special focus is given to the inverse methods and parameter estimation procedures, because through them it is possible to evaluate the thermophysical property, assuring the best practices and supplying the measurement uncertainty. It is also cited when the most common data processing algorithms are used, e.g., the Gauss–Newton and Levenberg–Marquardt least squares minimization algorithms, and how it is possible to retrieve values of TP from other data. Optimization criteria for designing the experiments are also mentioned. [ABSTRACT FROM AUTHOR]

Published
2022
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