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Investigations have been carried out over decades to enhance the heat transfer using active, passive and compound heat augmentation techniques. The present work includes passive heat transfer augmentation technique using non-metallic flow divider type inserts with air as working fluid. Whenever inserts are used for heat transfer enhancement, along with increase in heat transfer rate, the pressure drop also increases. This increase in pressure drop increases the pumping cost. Hence heat augmentation technique should optimize between the benefits of heat transfer rate and increased pressure drop. Initially, for validation of setup, experiments were carried out for plain tube. The results i.e. Nusselt number and friction factor obtained were validated against those obtained from empirical correlation. Secondly, Experimental investigations were carried out using flow divider type non-metallic inserts with varying the Reynolds number and heat input. The nusselt number is increased by 170% than that for plain tube. Overall Enhancement Efficiency(OEE) for different Reynolds number was above unity.

Heat Augmentation Using Non-metallic Flow Divider Type Inserts in Forced Convection