Slip-flow and heat transfer in microtubes with internal fins

The study of the simultaneous development of slip-flow and heat transfer in a microtube with internal fins has been conducted. It was found that rarefaction effects were more pronounced in the entrance region than in the fully developed region for both friction factor and Nusselt number. Minimal influence of the number of fins on rarefaction effects for the friction factor was observed, but a substantial influence on Nusselt numbers was noted. Tubes with larger fin height were found to enhance rarefaction effects on the friction factor, while the opposite was observed for Nusselt number. An evaluation criterion was used to compare the heat transfer and pressure drop in microtubes with and without fins. The results showed that the microtube with fins offers a significant performance advantage, especially in the entrance region and for tubes with a higher number of fins with a larger fin height. This study highlights that microtubes with internal fins have the potential to improve cooling efficiency in electronic circuit cooling applications compared to microtubes without internal fins.