Single Phase Laminar Flow Heat Transfer Enhancement A Review: (a) Combined Transverse Ribs and Twisted Tapes and (b) Combined Helical Screw Tape Inserts and Wire Coil Inserts

Abstract

Passive heat transfer enhancement is the most widely adopted technique in industries due to low implementation cost. This paper presents state of the art reviews of two very popular passive techniques namely, wall roughness (ribs and wire coils) and swirl generators (twisted tapes and helical screw tapes). This paper concludes that ribbed surfaces and wire coils have potential to improve the performance of heat exchangers at low pumping power penalty and when coupled with twisted tapes/helical screw tapes, more compact and high performance heat exchangers may be developed with considerable saving of materials and energy.