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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Freeze-Casting Method as an Alternative for Ceramic Capillary Evaporator Manufacturing
Submission Author:
Marcos Vinício Oro , SC
Co-Authors:
Marcos Vinício Oro, Frederico Marques Baumgratz, Caio Dias Fernandes, Isadora Schramm Deschamps, Marcio C. Fredel, Edson Bazzo
Presenter: Marcos Vinício Oro
doi://10.26678/ABCM.ENCIT2020.CIT20-0425
Abstract
Ceramic capillary evaporators have been proposed as an alternative to integrate two-phase passive thermal control systems. In the present work, the freeze casting method is considered for porous structures manufacturing and subsequent integration in a capillary pumped loop (CPL). Different sets of alumina samples were manufactured and characterized to obtain porosity, capillary pressure, critical diameter and permeability. Deionized water was used as the working fluid for the CPL thermal performance experiment. Throughout sample characterization the following results were found: porosity from 69 to 84 %, permeability from 1x10-12 to 6 x10-12 m², critical diameter from 11 to 40 µm and capillary pumping pressure from 7 to 26 kPa. The thermal performance of three samples was evaluated on a CPL, which was able to operate stably with application of powers in the evaporator up to 44 W (7 W/cm²), corresponding to a total thermal resistance of about 3 K/W (16 cm²·K/W). Although further investigations are necessary, the freeze casting method proved to be successful and valid for the manufacture of ceramic capillary evaporators.
Keywords
freeze casting, Capillary Pump Loop, ceramic evaporator, Alumina
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