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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

EXPERIMENTAL INVESTIGATIONS OF MIXED CONVECTION

Get access (open in a dialog) DOI: 10.1615/IHTC10.3430
pages 573-578

Sinopsis

Heat transfer behaviour is of special interest at transition from laminar to turbulent flow. Experimental investigations have been performed at the test section FLUTMIK using water as the actual fluid. Located at the center axis of the squared duct an electrically heated sphere generates buoyant conditions within the surrounding turbulent forced convection flow. Comparison is made with the wake flow of the unheated sphere evaluating Laser Doppler Anemometer measurements of the mean velocity field. In the case of the heated sphere the mean temperature field is measured additionally by a thermocouple probe.
Power laws are derived from the measurements describing the increase of the mean velocity, the decay of the mean temperature and the extension of the half value radius of the temperature with increasing axial distance from the sphere. In mixed convection flow the Gaussian bell shaped temperature profiles are selfpreserving.