Application of nanofluids in thermosyphons: A review

Nanofluids are widely used in recent years in order to enhance heat transfer in several mediums. Thermal performance of thermosyphons can be improved by employment of nanofluids. In this study, a comprehensive review is conducted on the studies focused on the thermosyphons filled with nanofluids. In addition, thermosyphons working with nanofluids in various applications are reviewed here. Based on the literature review, nanofluids have potential to significantly improve thermal performance of thermosyphons. In addition, it is concluded that thermal performance of nanofluidic thermosyphons depends on type of nanoparticles, base fluid, concentration and etc. Most of the reviewed studies have found that there is an optimum concentration for the nanofluids used in thermosyphons. In addition, the efficiency of the devices use nanofluidic thermosyphons are improved due to increased effective thermal conductivity of thermosyphons charged with nanofluids.