Heat Transfer Augmentation in Forced Convection with Regularly Spaced Inserts—A Review

Heat transfer augmentation techniques are widely used to enhance performance in the Process industries, Thermal Power Plants, Heat Exchangers, Air conditioning, Refrigeration industries, Automobiles etc. In heat transfer enhancement basically two types of techniques are used, Passive technique and Active technique. Out of these techniques Passive technique used widely used, as it does not consume energy to operate it. Researcher have investigated the performance parameters with different type of twisted tape. In this paper the detailed review of regularly spaced insert is discussed. In the regularly spaced inserts attempt is made to reduce pumping power by reducing obstacles in the flow. All the researcher has used twisted tape insert for study of regularly spaced inserts. In some of the research work special type of tube section is used like convergent divergent tube. Some of the researcher has found that regularly spaced insert helps for the enhancing overall performance ratio whereas some of them found that it affects adversely. Overall Enhancement Factor found to be improved between 1 and 1.66 at various Reynolds numbers.