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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Conjugate Cooling of Protruding Heaters in a One Side Closed Duct by Impinging Flow

Get access (open in a dialog) DOI: 10.1615/IHTC15.cnd.009556
pages 1532-1546

要約

The present work shows that the temperatures of an array of discrete heaters mounted on a conductive plate cooled by forced airflow may be predicted by dimensionless conjugate coefficients g+ij which may be grouped in a square matrix G+. In addition, the conjugate coefficients are invariant with the power dissipation in the heaters. An experimental investigation was performed with four protruding heaters mounted on the lower wall of a rectangular duct with one side closed and cooled by two impinging airflows exiting from the upper wall. Two distinct materials were employed as the duct lower wall: Plexiglas and aluminum. The conjugate coefficients g+ij were obtained in tests with a single active heater at a time and they were expressed as functions of a Reynolds number in the range from 2,000 to 7,000. Numerical CFD simulations considering flush mounted heaters on a similar duct were also performed to obtain the conjugate coefficients and the results were compared with those from the experiments. Additional experiments with two or three active heaters at a time were performed and the results showed that the conjugate coefficients g+ij may be used to predict the heaters’ temperatures under arbitrary heating conditions of the heaters array.