Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
High-Speed and Infrared Flow Boiling Visualization in Microchannels with modified surfaces
Submission Author:
Ana Moita , Lisboa , Portugal
Co-Authors:
Mariana Perez, Pedro Daniel Fernandes Pontes, Ana Moita
Presenter: Mariana Perez
doi://10.26678/ABCM.COBEM2023.COB2023-2432
Abstract
The present research aims to study the effect of microchannel cooling using two phase flow. With the aim of enhancing heat transfer and flow stability, surface modifications were investigated. Two stainless steel surfaces were tested, a smooth surface and one with two 100 um cavities 200 um apart. The setup included a single microchannel, manufactured in PDMS and placed on the heated surfaces. Results were obtained using two different techniques, infrared thermography and high speed images while pressure drop on the channel was also measured. Two different power values were supplied and two different flow rates were considered. Pressure drop results were inconclusive of the effect of surface indentations. The images taken allowed visualization of nucleation sites, and confirmed that none were found near the cavities. Nevertheless, the analysis proposed was able to identify where nucleation sites were formed. Slug flow interfacial heat transfer could be observed and accurately described in the thermal and heat transfer maps.
Keywords
microchannels, two-phase flows, Interfacial heat transfer
