Abstract :
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Enhanced heat transfer surface are used in many engineering applications such as heat exchanger, air conditioning, chemical reactor and refrigeration systems, hence many techniques have been investigated on enhancement of heat transfer rate and decrease the size and cost of the involving equipment especially in heat exchangers. One of the most important techniques used are passive heat transfer technique. These techniques when adopted in Heat exchanger proved that the overall thermal performance improved signi?cantly. This paper reviews works taken by researchers on this technique since 2004 such as twisted tape, wire coil, swirl ?ow generator etc. to enhance the thermal ef?ciency in heat exchangers and useful to designers implementing passive augmentation techniques in heat exchange. The authors found that variously developed twisted tape inserts are popular researched and used to strengthen the heat transfer ef?ciency for heat exchangers.
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