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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v17.i1.20
pages 15-40

SOME THERMOGRAPHIC MEASUREMENTS IN COMPLEX FLUID FLOWS

Giovanni Maria Carlomagno
Department of Aerospace Engineering, University of Naples, DETEC, Napoli, Italy

RESUMO

This paper deals with measurements performed with infrared (IR) thermography to measure wall convective heat fluxes in complex fluid flows. Convective heat fluxes are usually measured by means of a thermal sensor, described by a suitable heat transfer model, where transducers measure temperatures. If compared to standard transducers, the infrared camera appears to be very valuable because it is non-intrusive, has a high sensitivity (down to 20 mK), has a low response time (down to 20 μs); the camera is fully two-dimensional (from 80k up to 1M pixels, at 50 Hz) so, allowing for a better evaluation of errors due to radiation and tangential conduction within the sensor. By correctly choosing the measuring sensor, IR thermography can be exploited to resolve convective heat flux maps with both steady and transient techniques. The article presents a number of convective heat transfer measurements in complex fluid flows, performed with IR thermography by the author and his co-workers, which range from very low-speed flows (natural convection) to very high-speed ones (hypersonic regime).


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