Review of Heat Transfer Enhancement Using Passive Techniques in Different Type of Twisted Tapes in Circular Tube

Heat transfer enhancement techniques refer to different methods used to increase rate of heat transfer with-out affecting much the overall performance of the system. Heat transfer enhancement is the process of modifying a heat transfer surface to increase the heat transfer coefficient between the surface and a fluid. A majority of heat exchangers used in thermal power plants, chemical processing plants, air conditioning equipment, and processing plants, air conditioning equipment, and refrigerators, petrochemical, biomedical and food processing plants serve to heat and cool different types of fluids. This review paper based on different type of twisted tape and their different orientation or arrangements. In the present paper stress is given on to work dealing with displaced insert into circular tubes (twist tap insert, screw tap insert, helical tap insert, wire mesh tape insert) and CFD based analysis in laminar and turbulent flow. According to recent studies these are known to be economic heat transfer enhancement tools.