Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
REVIEW OF MICRO-HEAT PIPES: A CONCEPT OF AN EFFICIENT COOLING METHOD
Submission Author:
Ilvandro Luiz Souza Sueth Júnior , SP , Brazil
Co-Authors:
Cristiano Tibiriçá
Presenter: Ilvandro Luiz Souza Sueth Júnior
doi://10.26678/ABCM.ENCIT2016.CIT2016-0683
Abstract
Micro-heat pipes are passive devices with hydraulic diameter smaller than 1500 μm able to transport a high amount of heat with working fluid’s phase change. Direct applications of micro-heat pipes are in cooling compact electronic devices that need an effective refrigeration method to avoid high temperatures on its surfaces. In the last decades, many studies have been carried out focusing on micro-heat pipes development, from different combinations of working fluid type, filling ratio, orientation, material, geometry and size. These parameters must be chosen according to the temperature range between the evaporator and condenser. The objective of this study is to analyse methods of designing micro-heat pipes and the results obtained from different works. The hydraulic diameter observed were between 55 μm to 1500 μm and the most common used geometry was triangular-shape, as many authors state that is better for capillary effect, even though geometries like star grooves and rhombus grooves showed promising results. Substrates as copper and silicon, and working fluids as water, methanol and ethanol are preferred due to their capacity of increasing the effective thermal conductivity, which the highest values observed were between 600 W/m∙K and 7574 W/m∙K. Other important aspect about micro-heat pipes performance is the orientation relative to gravity, which was considered by a few authors and is a researching point to be further studied in future works. Thus, based on works found in literature, micro-heat pipes can be seen as a promising cooling technique, once it carries out a combination of micro size components with efficient ability of heat transport.
Keywords
micro-heat pipe, heat transport, phase change, cooling method
