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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i4.60
11 pages

INVESTIGATION OF NATURAL CONVECTION IN VERTICAL CHANNELS BY SCHLIEREN AND HOLOGRAPHIC INTERFEROMETRY

Dario Ambrosini
INFM-Dipartimento di Energetica, Universita dell’Aquila Loc. Monteluco di Roio, I-67040 Roio Poggio (AQ), Italy
Domenica Paoletti
INFM-Dipartimento di Energetica, Universita dell'Aquila Loc. Monteluco di Roio, I-67040 Roio Poggio (AQ), Italy
Giovanni Tanda
DIME, Università degli Studi di Genova

ABSTRACT

Heat transfer phenomena, which frequently involve convection, are usually described through a connective heat-transfer coefficient h. Precise measurement of h is difficult, since calculation requires knowledge of the temperature gradient between the solid surface and the fluid, measured, possibly, without disturbing the thermal layer. Optical techniques are powerful tools in experimental analysis because of their non-disturbing nature. In this paper, natural convection heat transfer in vertical channels is investigated by applying two different optical techniques, namely, schlieren and holographic interferometry. Experiments were conducted at DITEC, University of Geneva (Italy) and at the Energetic Department of the University of L 'Aquila (Italy) on the same test section. The obtained results are discussed and compared.


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