ERIC Number: EJ931547
Record Type: Journal
Publication Date: 2011-May
Abstractor: As Provided
On the Heat Transfer through a Solid Slab Heated Uniformly and Continuously on One of Its Surfaces
Marin, E.; Lara-Bernal, A.; Calderon, A.; Delgado-Vasallo, O.
European Journal of Physics, v32 n3 p783-791 May 2011
Some peculiarities of the heat transfer through a sample that is heated by the superficial absorption of light energy under continuous uniform illumination are discussed. We explain, using a different approach to that presented in a recent article published in this journal (Salazar "et al" 2010 "Eur. J. Phys." 31 1053-9), that the front surface of a thick sample reaches a higher equilibrium temperature than a thin one, a fact that may be against some people's first intuition. From the analytical solution of the problem, we obtain a condition necessary to apply a very thermally thin sample approximation, i.e. to neglect a temperature gradient across a sample. From the analysis of the heat transfer through both a thermally thin and a thermally thick sample, we suggest an inexpensive experiment suitable for measuring the thermal diffusivity of low thermal conductivity solids. Both the theoretical analysis and the suggested experiment can be suitable for students and teachers dealing with heat transfer problems, thermal characterization techniques and/or partial differential equations at undergraduate and graduate levels.
Descriptors: Heat, Science Instruction, Thermodynamics, Light, Energy, Physics, Science Experiments, College Science, Undergraduate Study, Graduate Study
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Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Authoring Institution: N/A