21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-5.4.1

HEAT TRANSFER MEASUREMENTS IN A ROTATING CHANNEL

Astarita T., Cardone G., Carlomagno G. M.
University of Naples, DETEC, Italy

Keywords: heat transfer measurements, rotating channel

A new experimental methodology is used in order to perform local measurements of the heat transfer distribution nearby a 180deg sharp turn in a rotating rectangular channel by means of infrared (IR) thermography. To carry out the heat transfer measurements, the heated-thin-foil technique is employed and the channel is put in rotation in a vacuum tank so as to minimise the convective heat transfer losses at ~e outside surface of the channel. The thermal boundary condition being used during the tests is of one uniformly heated wall and three adiabatic ones. Results are reported either in local form or as averaged Nusselt number profiles along the channel. The latter representation is made in order to compare present results with the ones already existing in the literature. Local data are presented in terms of temperature and normalised Nusselt number distributions.

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