The Thermal Diffusivity of Biochar Coating Deposited on a Heat Exchanger

Bison, Paolo; Ferrarini, Giovanni; Morselli, Nicoló; Muscio, Alberto; Rossi, Stefano

doi:10.3390/engproc2023051026

Cited by 2 publications

References 10 publications

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Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Bison,

Ferrarini,

Glorieux

et al. 2024

Thermosense: Thermal Infrared Applications XLVI

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This work deals with the characterization of biochar deposited on a thin metallic sheet, used to enhance the evaporation in heat exchangers. The effectiveness of such deposit is done by means of the heated thin foil thermographic technique. The thermal diffusivity of the foil is the main objective of this study. In the proposed method, a pulse of 2 ms duration is produced by a laser, and periodically projected on the surface of an opaque sample of which the thermal parameters have been determined by classical measurements. The spatial distribution of the laser light pattern is random, after passing through a mask like a QR code. Several masks with different spatial features and distribution were prepared by sputtering thin layer (100 nm) of gold on a piece of glass covered by a pattern. Using the masks, samples were photothermally excited by impulsive laser light patterns. The resulting dynamic temperature field evolution at the sample surface was observed by a fast IR camera in the LW, and the thermal diffusion process was recorded by a sequence of IR images. In this contribution, a theoretical model is described and utilized to analyze the spatiotemporal dependence of the temperature field.

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Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Bison,

Ferrarini,

Glorieux

et al. 2024

Thermosense: Thermal Infrared Applications XLVI

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Thermal Material Property Evaluation Using through Transmission Thermography: A Systematic Review of the Current State-of-the-Art

Ali,

Addepalli,

Zhao

2024

Applied Sciences

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Determining thermal material properties such as thermal diffusivity can provide valuable insights into a material’s thermal characteristics. A well-established method for this purpose is flash thermography using Parker’s half-rise equation. It assumes one-dimensional heat transfer for thermal diffusivity estimation through the thickness of the material. However, research evidence suggests that the technique has not developed as much as the reflection mode over the last decade. This systematic review explores the current state-of-the-art in through-transmission thermography. The methodology adopted for this review is the SALSA framework that seeks to Search, Appraise, Synthesise, and Analyse a selected list of papers. It covers the fundamental physics behind the technique, the advantages/limitations it has, and the current state-of-the-art. Additionally, based on the Population, Intervention, Comparison, Outcome, and Context (PICOC) framework, a specific set of inclusion and exclusion criteria was determined. This resulted in a final list of 81 journal/conference papers selected for this study. These papers were analysed both quantitatively and quantitatively to identify and address the current knowledge gap hindering the further development of through-transmission thermography. The findings from the review outline the current knowledge gap in through-transmission thermography and the challenges hindering the development of the technique, such as depth quantification in pulsed thermography and the lack of a standardised procedure for conducting measurements in the transmission mode. Overcoming some of these obstacles can pave the way for further development of this method to aid in material characterisation.

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The Thermal Diffusivity of Biochar Coating Deposited on a Heat Exchanger

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

Cited by 2 publications

References 10 publications

Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Periodic projection of a random spatial pattern for the assessment of the in-plane thermal diffusivity

Thermal Material Property Evaluation Using through Transmission Thermography: A Systematic Review of the Current State-of-the-Art

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