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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL INVESTIGATION OF AN INVARIANT DESCRIPTOR FOR THE CONJUGATE COOLING OF DISCRETE HEATERS IN A DUCT
Submission Author:
Paulo Vitor Ribeiro Plácido , Buscando endereço... , Brazil
Co-Authors:
Paulo Vitor Ribeiro Plácido, Carlos Altemani
Presenter: Paulo Vitor Ribeiro Plácido
doi://10.26678/ABCM.ENCIT2020.CIT20-0053
Abstract
Circuit boards are usually cooled by forced airflow and the heat transfer from the discrete electronic components may be enhanced by conductive boards. An experimental investigation was performed to show that the temperatures of four protruding heaters mounted on the conductive lower wall of a rectangular duct cooled by forced parallel airflow may be conveniently predicted by means of dimensionless conjugate coefficients $g^+_{ni}$. These coefficients are invariant with the heaters' power dissipation and they may be grouped in a square matrix $G^+$ of order equal to the number of heaters. The conjugate coefficients were conveniently obtained from tests with a single active heater at a time. They were expressed as functions of the airflow Reynolds number, based on the duct hydraulic diameter, in the range from 2,000 to 6,100. These coefficients constitute the conjugate coefficients matrix $G^+$ of order four in these experiments. Additional experimental tests will be performed for distinct duct flow rates and arbitrary power dissipation in each heater, with two or three active heaters at a time. It is expected that the measured heaters' temperatures in these tests will be well predicted using the previously obtained invariant conjugate coefficients matrix $G^+$.
Keywords
Conjugate forced convection-conduction, protruding heaters, dimensionless conjugate coefficients, invariant descriptors
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