• Shrikant Dwivedi
• Deenoo Pawar

The development of high-performance thermal systems has increased interest in heat transfer enhancement techniques. Heat transfer augmentation techniques refer to different method used to increase rate of heat transfer without affecting much the overall performance of the system. Heat exchangers are widely used in industry both for cooling and heating. Creation of turbulence with the help of twisted tape in the flow passage is one of the favorable passive heat transfer augmentation techniques due to their advantages of easy fabrication, operation as well as low maintenance. Heat transfer enhancement or augmentation techniques refer to the improvement of thermo hydraulic performance of heat exchangers. Among many techniques (both passive and active) investigated for augmentation of heat transfer rates inside circular tubes, a wide range of inserts have been utilized, particularly when turbulent flow is considered. A lot of methods are applied to increase thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled tubes, and surface tension devices. Furthermore, as a heat exchanger becomes older, the resistance to heat transfer increases owing to fouling or scaling. These problems are more common for heat exchangers used in marine applications and in chemical industries. In some specific applications, such as heat exchangers dealing with fluids of low thermal conductivity (gases and oils) and desalination plants, there is a need to increase the heat transfer rate. The heat transfer rate can be improved by introducing a disturbance in the fluid flow (breaking the viscous and thermal boundary layers), but in the process pumping power may increase significantly and ultimately the pumping cost becomes high. Therefore, to achieve a desired heat transfer rate in an existing heat exchanger at an economic pumping power, several techniques have been proposed in recent years.

Applicability of double ribbed twisted tapes in heat transfer enhancement of tubular heat exchanger

"Applicability of double ribbed twisted tapes in heat transfer enhancement of tubular heat exchanger", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 12, page no.a264-a271, December-2021, Available :http://www.jetir.org/papers/JETIR2112031.pdf

"Applicability of double ribbed twisted tapes in heat transfer enhancement of tubular heat exchanger", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 12, page no. ppa264-a271, December-2021, Available at : http://www.jetir.org/papers/JETIR2112031.pdf