Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
INFLUENCE OF GROOVES ON THE THERMAL BEHAVIOR OF MINI PULSATING HEAT PIPES
Submission Author:
Larissa Krambeck , SC
Co-Authors:
Larissa Krambeck, Kelvin Guessi Domiciano, Marcia Mantelli
Presenter: Larissa Krambeck
doi://10.26678/ABCM.ENCIT2022.CIT22-0122
Abstract
This research experimentally investigated the impact of grooves on the thermal performance of mini flat pulsating heat pipes used for surface electronic cooling applications. A novel channel design, which was made of a square channel with 4 (four) machined grooves along the longitudinal direction, was proposed, combining characteristics of an oscillating heat pipe and capillary structure. Three PHPs with 16 parallel channels were manufactured using diffusion bonding, tested and compared to each other. PHP-A had a conventional square channel. PHP-B and PHP-C were fabricated with the novel channel profile. Their essential difference is that PHP-C has grooves through all sections while PHP-B presents the novel design only in the evaporator section. Ethanol was used as the working fluid. Heat transfer rates from 10 to 170 W were studied under horizontal and gravity-assisted orientations. Both PHPs with the novel channel reduced the thermal resistance and anticipated the startup in the gravity-assisted orientation. However, the modifications only in the evaporator showed to be a better alternative for electronics cooling submitted a wide range of dissipated power. Without gravity assistance, just the square PHP operated satisfactorily, being the best option under concentrated thermal loads. Although the 4 (four) machined grooves and the edges worked as a capillary structure, the promoted capillarity was not enough for a proper operation in the horizontal position.
Keywords
Pulsating Heat Pipe, Grooves, Thermal performance, Electronics cooling
