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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
THERMAL-HYDRAULIC CHARACTERIZATION OF A TRIANGULAR MICROCHANNEL REGENERATOR VIA THE SINGLE-BLOW METHOD
Submission Author:
Paulo Vitor de faria , SC
Co-Authors:
Paulo Vitor de faria, Bernardo Vieira, Hígor Feltrin Teza, Gislaine Hoffmann, Guilherme Fidelis Peixer, Alan Nakashima, Jaime Lozano, Jader Riso Barbosa Jr.
Presenter: Paulo Vitor de faria
doi://10.26678/ABCM.ENCIT2022.CIT22-0725
Abstract
Despite their importance in several engineering applications, there are conflicting results in the literature re- garding the thermo-hydraulic behaviour of microchannel thermal regenerators, especially concerning the Nusselt number and their relation with equivalent microchannels of the same geometry. In this work, two La-Fe-Si triangular microchan- nel regenerators were submitted to pressure drop and single-blow tests to determine their Ergun’s constant and Nusselt number. The pressure drop tests consisted of measuring the regenerator pressure drop in steady flow for several mass flow rates and finding the Ergun’s constant from a best fit of the data. The single-blow tests consisted of submitting the regenerator to a steady-state flow in which the inlet temperature suffers a step wise change and measuring the temperature profile of the outlet of the regenerator. The energy equations for both the solid and fluid in this situation are know and are a function of the NTU, allowing for its value (and consequently, the Nusselt number) to be determined through a curve fitting method. The results showed an Ergun’s constant of 0.17, indicating a much smaller pressure drop than in a packed bed of spheres, as expected, and that the Nusselt number does not seem to depend on the Reynolds number and has a value close to 2.49, which is known to be the Nusselt number of a triangular macrochannel with a constant wall temperature.
Keywords
microchannel regenerator, triangular microchannel, pressure drop, Heat transfer, single blow
