*A.P.Sivasubramaniam1 Experimental Investigation of Passive Heat Transfer Enhancement Using in Plain Tape Insert *A.P.Sivasubramaniam 1 , K.Mayilsamy 2 and P.Murugesan 3 1 Department of Mechanical Engineering, Paavai Engineering College, Namakkal, Tamil Nadu, India 2 Department of Mechanical Engineering, PSG College of Technology, Coimbatore, Tamil Nadu, India 3 Department of Mechanical Engineering, K.S.R Institute for Engineering and Technology, Namakkal, Tamil Nadu, India Email: 1 visuga@rediffmail.com, 2 k_mayilsamy@yahoo.com, 3 pmksrct@gmail.com Abstract In present days, almost all the industries that use heat exchangers use them at present with inserts required to improve the convective heat transfer rate of the system without the overall performance getting affected. Even the inserts can be conveniently set up and require less maintenance aside from the cost benefits.Given the successful role of inserts in the usage of exchangers, the present study experimentally examines the contribution of plain tape inserts that are mounted within the plain tube of a dual pipe heat exchanger (DPHE) to increase the system's heat transfer capacity.Using a simple tube under counterflow structure for variable pressure drops in hot water, an experimental system is used to conduct the test process and measurement is performed for various mass flow speeds of hot and cold water inlet temperatures at 53 0 C and 30 o C respectively.From the experimental measurements the thermal enhancement factor and even the properties of heat flow and friction effect are learned from the results of the experiments.The experiments are repeated with the proposed insert profiles to compare the results with that of the plain tube. It is observed from the tests that the plain tape insert gave the highest thermal enhancement level. Keywords: Heat transfer enhancement, friction factor, plain tube & plain tape. 1. Introduction The double pipe heat exchanger may be a way of simplifying the interchange of two fluids with heat b / w by not reacting at various temperatures.Two forms of heat transfer occurs in heat exchanger such as convection & conduction. Typically convection happens in each operating fluids & conduction through walls of heat exchanger that separates the fluids. The potential to increase the coefficient of heat transfer along with reduced reduction of the friction factor determines the inserts.For various industrial areas, tube extensions are used for developments in the heat transfer of fossil fuel and for chemical plants in just a few years.The second law increases effectiveness and entropy production by raising the driving force of properties as compared by the rise in the coefficient of heat transfer.The research provides an evaluation of friction factor & heat transfer coefficient for various inserts of different thicknesses and materials (Aluminum & Copper) discussed by AjitShinde et al., [1] [2]. Tierärztliche Praxis ISSN: 0303-6286 Vol 40, 2020 968