A Review of Recent Passive Heat Transfer Enhancement Methods

Improvements in miniaturization and boosting the thermal performance of energy conservation systems call for innovative techniques to enhance heat transfer. Heat transfer enhancement methods have attracted a great deal attention industrial sector due their ability provide savings, encourage proper use sources, increase economic efficiency systems. These are categorized into active, passive, compound techniques. This article reviews recent passive techniques, since they reliable, cost-effective, do not require any extra power promote conversion systems’ when compared active methods. In approaches, various components applied transfer/working fluid flow path improve rate. The studied this include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough (corrugated/ribbed surfaces), nanofluids (mono hybrid nanofluids).