An iterative method for temperature gradient measurements in two-dimensional thermal boundary layer flows by speckle photography
| Autor: | Didier Varieras, Philippe Gervais, Charles Crespy |
|---|---|
| Přispěvatelé: | CETHIL, Laboratoire, Centre d'Energétique et de Thermique de Lyon (CETHIL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2009 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Convective heat transfer [PHYS.MECA.THER] Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] Iterative method business.industry Mathematical analysis Computational Mechanics Parabola General Physics and Astronomy Boundary layer Temperature gradient Optics Mechanics of Materials Heat transfer [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] business Refractive index ComputingMilieux_MISCELLANEOUS [SPI.MECA.THER] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] Second derivative |
| Zdroj: | Experiments in Fluids Experiments in Fluids, Springer Verlag (Germany), 2010, 48 (2), pp.345-354 |
| ISSN: | 1432-1114 0723-4864 |
| DOI: | 10.1007/s00348-009-0741-3 |
| Popis: | An iterative method for measuring two-dimensional refractive index fields induced by convective heat transfer phenomena is presented. Starting from the so-called correction parabola, this reconstruction technique takes into account the local second derivative variation of the refractive index field. The efficiency of the method is analytically defined as a function of non-dimensional parameter and numerically investigated using a ray-tracing code for different classic index profiles and a thermal boundary layer case. Finally, as an implementation test, this algorithm is applied to an impinging jet heat transfer experiment using speckle photography measurement data set. The results show a relative dispersion of 20% compared to the parabola reconstruction when the refractive index gradient becomes more severe. |
| Databáze: | OpenAIRE |
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