Multi-scale microchannel fabrication molding and heat transfer performance research
Aims:This paper aims to clarify the flow boiling heat transfer performance of microchannels enhanced by micro columns.Methods:A visualization experimental platform built with a high-speed camera was used to capture the flow changes and characterization parameters such as temperature and pressure during the flow boiling process.Results:At different flow rates,the microcolumn arrays strengthened the heat exchange performance of the microchannels compared with the microchannels without added microcolumn arrays;and the flow change and heat exchange performance of different shapes of microcolumn arrays were different.It was found that the microcolumn array could alleviate the instability phenomenon in the boiling process of microchannel flow to a certain extent and reduction of pressure drop fluctuation values by more than 50% .Conclusions:Channel implantation of micro-pillar arrays can realize the requirements of enhanced heat transfer characteristics,and effectively alleviate the phenomenon of micro-channel flow instability,especially with the streamlined micro-pillar arrays of the most significant perturbation ability.
microcolumn array microchannelsflow boilingflow pattern transformationenhanced heat transfer
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