Efficiency enhancement of heat exchanger using inserts and nano-fluid - A review

• Published in: Materials today : proceedings Vol. 44; pp. 4399 - 4403
• Main Authors: Bhatnagar, Mudit K., Rai, Mayank, Ashraf, Muneeb, Kapoor, Om, Mamatha, T.G., Vishnoi, Mohit
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2021
• Subjects: Ferrofluids; Heat Exchanger; Heat transfer; Multi-walled carbon nanotubes (MWCNTs); Nanofluids; Multi-walled carbon nanotubes (MWCNTs); Heat Exchanger; Ferrofluids; Heat transfer; Nanofluids
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2020.10.575

This review paper comprises of two methods of improving the efficiency of heat exchanger: the swirl flow technique using inserts and the nanofluid addition method. These are few passive techniques and do not require any external power source for its functionality. But they provide significant enhancements in the heat transfer parameters (up to 30%) at the cost of pressure drop, whose regeneration is also discussed by the action of hybrid nanofluid of Multi-Walled Carbon Nanotubes (MWCNTs). The deviation in thermophysical properties (Nusselt number, friction factor, and pressure drop) with the addition of inserts and nanofluids from their original values has been studied. The review concludes that the enhancement of efficiency is achieved through pressure drop in passive enhancement techniques.