Thermal diffusivity imaging

Gfroerer, T. H.; Phillips, Ryan; Rossi, P.

doi:10.1119/1.4928277

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…Non-equilibrium states, in which temperatures are changing over time and there are variable thermal energy flows, are definitely much more complex to treat from a theoretical viewpoint. Despite the large number of non-stationary situations in physics and engineering studies and some valuable examples of how IR imaging can be helpful in treating these subjects [20][21][22], high school students, but also undergraduates, often do not handle the required formal tools to attack and understand these chapters of technical and applied physics.…”

Section: Introductionmentioning

confidence: 99%

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Infrared imaging of a non-stationary thermal conductive process and observation of its Green’s kernel

Oss

2019

Eur. J. Phys.

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A simple experiment is devised to visualize, through the infrared thermal imaging technique, the time dependence of the transient temperature distribution in a solid, metallic rod. The Laplace transform method is adopted to obtain a theoretical model which is numerically solved. The particular case of a thermal shock imposed to one end of a single rod is then considered and a simplified form of the Laplace transform solution is analytically developed. The resulting expression is shown to constitute the Green’s heat kernel for the rod problem. This propagator has a simple analytical expression which allows for its explicit study and comparison with the experimental temperatures. The onset of a ‘heat wave’ and its temperature peak is observed and described within the Green fundamental solution. Further comparisons are also made in terms of numerical simulations based on a free app devoted to thermal partial differential equations. The experiment and the mathematical treatment here presented have been developed especially for undergraduate physics students in an educational framework.

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Section: Introductionmentioning

confidence: 99%

“…Substituting equations (20) and (22) in equation (19), considering the small value of δ, a simple integration leads to the following expression for the temperature distribution:…”

mentioning

confidence: 99%

Infrared imaging of a non-stationary thermal conductive process and observation of its Green’s kernel

Oss

2019

Eur. J. Phys.

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“…In university courses, they are particularly useful for conducting demonstrative classes and laboratory experiments [5][6][7]. Furthermore, the cost of thermal cameras has decreased in recent years, resulting in their increased use in various physics topics and the proposal of numerous related activities [8][9][10][11][12]. Their increasing affordability has made them more accessible to a wider range of users, including students and researchers, and they are increasingly being integrated into university courses to enhance the learning experience [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Seeing the invisible: convection cells revealed with thermal imaging

et al. 2023

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Fluid instabilities are ubiquitous phenomena of great theoretical and applied importance. In particular, an intriguing example is the thermocapillary or Bénard-Marangoni instability which occurs when a thin horizontal fluid layer, whose top surface is free, is heated from below. In this phenomenon, after passing a certain temperature difference threshold, the fluid develops a regular pattern, usually hexagonal, of convection cells known as Bénard convection. In general this pattern is not visible to the naked eye unless specific tracers are incorporated into the fluid. The use of thermal imaging is a simple alternative not only for directly observing these phenomenon but also for obtaining valuable quantitative information, such as the relationship between the critical wavelength and the thickness of the fluid layer. Here, we propose an experiment specially suited for laboratory courses in fluid mechanics or nonlinear physics that involves the use of thermal cameras, or appropriate smartphone accessories, to study Bénard convection.

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“…imaging of temperature distributions using mostly infrared (IR) cameras. In the first category fall experiments using relaxation techniques [1,2] measured with arrays of thermometers or thermocouples [3,4], with a hot wire method [5], by the deflection of a laser beam through the temperature gradient in Plexiglas [6] and with an IR camera [7]. In the second category thermal imaging with thermal sensitive foils was proposed [8], but in most papers IR cameras are used for qualitative imaging of objects from daily life [9,10], vegetation [11], paintings [12], the Moon [13], black bodies [14] and heat conduction and convection processes [15].…”

Section: Introductionmentioning

confidence: 99%

Heat conduction in carrots studied with an IR-camera

Hänisch

Ziese

2021

Eur. J. Phys.

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Heat conduction and diffusion are important phenomena for the understanding of many physical, chemical and biological processes. In physics education these topics are an area to effectively relate the complexity of the mathematical description with modern experimental techniques that enable students to conduct their own research projects. In this work an infrared (IR) camera was used to image temperature profiles of carrot cross-sections after boiling. Using modelling of the spatial and temporal evolution of the heat conduction process it was possible to extract a value of the thermal diffusivity of D = (2.3 ± 0.2) × 10−7 m2 s−1. From this a thermal conductivity κ = (0.9 ± 0.1) W m−1 K−1 was calculated. The heat transfer coefficients between water and carrot of h W = (333 ± 50) W m−2 K−1 and between air and carrot of h A = (7 ± 1) W m−2 K−1 were determined. This experiment could be potentially used as an experiment in the general physics or in the advanced physics laboratory in the second or third year.

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Thermal diffusivity imaging

Cited by 13 publications

References 16 publications

Infrared imaging of a non-stationary thermal conductive process and observation of its Green’s kernel

Infrared imaging of a non-stationary thermal conductive process and observation of its Green’s kernel

Seeing the invisible: convection cells revealed with thermal imaging

Heat conduction in carrots studied with an IR-camera

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