A comprehensive review on compound heat transfer enhancement using passive techniques in a heat exchanger

•Twisted tape inserts perform improved heat transfer augmentation in laminar flow than in the turbulent.•Twisted tape inserts are preferred in both laminar and turbulent flows if the pressure drop penalty is not much concern.•Twisted tapes, the researchers should focus to reduce the pressure drop by using short-length twisted tapes.•Wire coil gives improved overall heat transfer coefficient the pressure drop penalty is considered.•Helical screwtape inserts can help to stimulate higher heat transfer exchange rate than the use of twisted tape inserts.•Delta winglet generates the vortexes which increases the heat transfer without much increase in friction factor.•Thermal performance factor increases with increasing number of perforated whole in conical ring.•Helical ribs have a significant effect on the heat transfer and pressure drop.•Helically coiled corrugated tubes give improved heat transfer enhancement.