1,721,002 research outputs found
White-light speckle photography technique applied for free convection heat transfer problems
No full textWhite light speckle photography, as its laser counterpart, measures light beam deflection through a phase
object, that is a transparent medium with non uniform refractive index. As the beam deflection at the
solid surface is connected to the wall-temperature gradient, a convection heat transfer coefficient can
be obtained. In this work, the advantages and disadvantages of using a white light speckle photography
technique are evaluated using both simulation and experimental comparison with a different optical
technique, namely holographic interferometry. The simulation study is proposed to analyze the sensitivity
of the technique to different data reduction algorithms. Sensitivity problems, when the working fluid is air,
are considered and suggestive discussions are made to further improve the sensitivity, such as modifying
the experimental setup and/or introducing an image offset. Finally, some selected experimental results
and a brief discussion are presented for several free convection heat transfer problems
Application of tomographic algorithms to Schlieren optical data for the study of convection heat transfer
No full textRicostruzione tomografica di campi termici tridimensionali con ridotto numero di proiezioni
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Speckle-based deflection techniques in diffusivity measurements
No full text"Optical techniques have a long tradition in flow visualization, allowing both qualitative and quantitative analysis. In particular, speckle photography, introduced in 1968, has been. extensively used. The aim of this work is to discuss speckle-based deflection techniques in the. investigation of diffusion phenomena in liquids.
On the edges of the rainbow and beyond: using colours mapping in multispectral diagnostics of artworks
No full textLa realtà virtuale dallo Spazio al Museo: uno strumento nell’esplorazione delle Opere d’Arte
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