abstract
This study investigates the natural cork thermal anisotropy and its variability using plane slice samples of 1.4 mm thickness, cut along the principal radial, longitudinal, and tangential directions, from bark previously treated for cork stoppers production. Heating was pointwise applied to the rear face using a copper needle coupled to a Peltier element, while an in-plane thermographic technique monitored temperature evolution on the front surfaces using a Flir SC5650 infrared camera. Thermal diffusivity measurements yielded values of 0.172 +/- 0.038 mm2/s (radial), 0.161 +/- 0.022 mm2/s (longitudinal), and 0.160 +/- 0.027 mm2/s (tangential). Additionally, a volumetric heat capacity of 0.25 MJ/(m3 center dot K) was determined using the Hot Disk technique. This information enabled the calculation of thermal conductivity, ranging from 0.033 to 0.048 W/(m center dot K). Findings align with existing literature, which reports thermal diffusivity between 0.08 and 0.24 mm2/s and thermal conductivity between 0.035 and 0.045 W/(m center dot K). This study contributes valuable insights into the thermal properties of natural cork and their orientation-dependent variability.
keywords
CONDUCTIVITY
subject category
Engineering; Instruments & Instrumentation
authors
Santos, T; Amaral, JS; Amaral, VS; Costa, VAF
our authors
João Cunha de Sequeira Amaral
Assistant Researcher
Tiago André César dos Santos
Post-Doc Fellowship
Vitor Brás Sequeira Amaral
Full professorProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
Authors acknowledge the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds throughthe FCT/MCTES (PIDDAC) and by the projects UIDB/00481/2020 and UIDP/00481/2020, FCT and CENTRO-01-0145-FEDER-022083, Centro2020, under the PORTUGAL 2020 Partnership Agreement. V. A. F Costa acknowledges the project UID/EMS/00481/2019-FCT-FCT-Fundacao para a Ciencia e a Tecnologia; and CENTRO-01-0145-FEDER-022083-Centro Portugal Regional Operational Programme (Centro2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) . T. Santos acknowl-edges Fundacao para a Ciencia e a Tecnologia (FCT) for its financial support via the project CDRSP Base Funding(DOI: 10.54499/UIDB/04044/2020) and via the project CDRSP Programatic Funding (DOI: 10.54499/UIDP/04044/2020) .r the FCT/MCTES (PIDDAC) and by the projects UIDB/00481/2020 and UIDP/00481/2020, FCT and CENTRO-01-0145-FEDER-022083, Cen-tro2020, under the PORTUGAL 2020 Partnership Agreement. V. A. F Costa acknowledges the project UID/EMS/00481/2019-FCT-FCT-Fundacao para a Ciencia e a Tecnologia; and CENTRO-01-0145-FEDER-022083-Centro Portugal Regional Operational Programme (Cen-tro2020) , under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) . T. Santos acknowl-edges Fundacao para a Ciencia e a Tecnologia (FCT) for its financial support via the project CDRSP Base Funding (DOI: 10.54499/UIDB/04044/2020) and via the project CDRSP Programatic Funding (DOI: 10.54499/UIDP/04044/2020) .