Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
The freeze casting method as a production alternative for ceramic capillary evaporators
Submission Author:
Frederico Marques Baumgratz , SC , Brazil
Co-Authors:
Frederico Marques Baumgratz, Marcos Vinício Oro, Marcio C. Fredel, Edson Bazzo
Presenter: Frederico Marques Baumgratz
doi://10.26678/ABCM.COBEM2017.COB17-1945
Abstract
An alternative method for the production of ceramic wicks for a capillary pumped loop (CPL) is presented. The freeze casting method is considered to provide a desired distribution of the size porous along the wick structure in order to maximize the capillary pressure required for CPL systems. The characterization of the structure is also presented, including porosity, critical diameter, capillary pressure and permeability. Two different slurries were prepared varying the water/solid ratio, wherein group A corresponds to 50 wt% alumina and 50 wt% water and group B, 65 wt% alumina and 35 wt% water. For both, groups A and B, an average porosity of about 57.1 and 64.7 %, critical diameters of 10.91 and 21.81 µm, a permeability of 5.45 x 10^-13 and 1.95 x 10-^13 m² and capillary pumping pressure of 26.4 and 13.2 kPa were found, respectively. The measured characteristics meet the reference characteristics found in technical literature as well in successfully tested evaporators.
Keywords
cpl, freeze casting, Alumina, ceramic wick, capillary structure, Capillary Pump Loop
