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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL MEASUREMENTS OF CONVECTIVE HEAT TRANSFER COEFFICIENT AROUND A SINGLE BUNDLE IN COMPOUND CHANNEL
Submission Author:
Fábio Kayser , DF
Co-Authors:
Fábio Kayser, Alexandre Alencar de Melo, Jhon Goulart, Jalusa Maria da Silva Ferrari
Presenter: Fábio Kayser
doi://10.26678/ABCM.ENCIT2020.CIT20-0549
Abstract
This work aims to evaluate the experimentally the convective heat transfer coefficient around a single rod bundle. The single rod bundle is part of a compound channel that is mainly characterized by their dimensionless numbers such as the Reynolds number, Prandlt number and the gap, g. The gap g is the distance between the rod and the upper part of the channel. During the experimental campaign the gap g was changed its width, 10 and 5 mm, yielding a W/D = 1.10 and 1.05, respectively.The dimension W is the sum of the gap, g, plus the cylinder’s radius. The test section length was kept constant, 1800 mm. Special heated cell, controlled by a Minipa 3305 Power Supply, was designed.in order to keep cell`s surface heated. The temperature on the cell`s surface was acquired through a set of special thermocouples on it. Regardless the W/D test sections coherent structures, yielding periodic flow velocity patterns, were found at the gap vicinity. As regards the Nusselt number measurements was found in good agreement with previous data from another researchers.
Keywords
Nusselt number, heated cell, compound channel, Rod bundle, Coherent Structures, hot wire annemometry
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