Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EFFECT OF POROUS MICROSTRUCTURED ON POOL BOILING OF DI-WATER
Submission Author:
Arthur Gomes da Silva Vilaronga , BA , Brazil
Co-Authors:
Arthur Gomes da Silva Vilaronga, Renan Rezende, Leonardo Manetti, Elaine Maria Cardoso
Presenter: Arthur Gomes da Silva Vilaronga
doi://10.26678/ABCM.COBEM2023.COB2023-0619
Abstract
The technology industry's growth has motivated the development of optimized thermal control techniques, such as pool boiling. Different microstructure surface designs have been developed to enhance the two main parameters of pool boiling: heat transfer coefficient and critical heat flux. Micro pin fins and microchannels are commonly used to enhance heat transfer in various applications; however, the capillary effect can be inhibited as heat flux increase due to the large vapor amount on the heating surface. Alternatively, metal foams provide a large surface area and can promote liquid replacement on the surface, enhancing the capillary action and improving heat transfer performance. The current work aims to analyze the influence of different porous microstructured surfaces, based on microchannels and micro pin fins, on pool boiling heat transfer of DI water. Porous microstructures with a thickness of 1 mm, 1.5 mm width, and 0.5 or 1 mm inter-fin space were used. The copper metal foams with a thickness of 1 mm were welded on the copper block, and the different structures (microchannels and micro pin fins) were fabricated using the electric discharge machining process. The results indicate that porous copper microchannels are the best alternative as intensification techniques for pool boiling heat transfer. They can reduce the resistance to bubble departure for high heat fluxes values by combining the effect of a continuous supply of liquid to the boiling interface without compromising the effect surface area-to-volume ratio.
Keywords
pool boiling, metal foam, micro pin fins, enhancement techniques
