International Journal of Research in Advent Technology, Special Issue, March 2019 E-ISSN: 2321-9637 3 rd National Conference on Recent Trends & Innovations In Mechanical Engineering 15 th & 16 th March 2019 Available online at www.ijrat.org 52 An Experimental Investigation on Heat Transfer in Automobile Radiator Using the Reinforcement of Titanium Dioxide Nano-Fluid in Coolant P Praveen Kumar Reddy 1 , Als Brahma Reddy 2, Cherukupalli Sudhakar 3 1 Assitant Professor, Siddhartha Institute of Engineering and Technology, Hyderabad, TS, India, 2 Assistant Professor, Siddhartha Institute of Engineering and Technology, Hyderabad, TS, India 3 Associate Professor, Siddhartha Institute of Engineering and Technology, Hyderabad, TS, India, Praveen92reddy@gmail.com, sukareddy@gmail.com, saisudha343@gmail.com Abstract :Now days Internal Combustion (I C) Engine produces power by combustion of fuel. Most of the I.C Engines are cooled using either water or liquid or air through heat exchangers. Only 25% of heat is converted to useful power & the remaining heat is dissipated. If the heat dissipation is not done properly it will cause a serious damage to the engine. With the advancement of nanotechnology the new generation of heat transfer fluids are known as “Nano fluids” has been developed which made researchers to next level. These fluids offer higher thermal conductivity compared to that of conventional coolants. This study is focused on the application of Titanium Dioxide Nanoparticles (TiO 2 ) in Ethylene Glycol as base fluid in an automotive cooling system. Nano fluid properties and empirical correlations were known from literatures to investigate the heat transfer enhancement of an automotive radiator operated with Nano fluid based coolant. Experimentation is carried out to comparison of overall heat transfer coefficient and the heat transfer rate in cooling system of engine radiator with and without application of TiO 2 nano fluids in different volumes when mixed with base fluid i.e., Ethylene Glycol. Keywords: IC Engines, Nano Fluids, TiO 2 , Ethylene Glycol. 1. INTRODUCTION Continuous research in automotive industries has raised the demand for high efficiency engines. A high efficiency engine is not only based on its performance but also in terms of better fuel economy and less emissions. There are many systems that influence the performance of engine like method of fuel injection system, emission system, cooling system, etc. one of the parameters which affects the performance of engine is the cooling rate of radiator in engine cooling system. The automotive industry is continuously involved in strong research and development to obtain the best in multiple aspects like performance, fuel consumption, aesthetics, safety, etc. By Jadhao, J. S etal [1] air-cooled heat exchangers that are found in a vehicle (radiator, AC condenser and evaporator, charge air cooler, etc.) plays an important role in its weight and also in the design of its front-end module, which also gives a greater impact on the aerodynamic behavior of automobile. George et al [2] in their research considered these as challenges, and concluded that an optimization process is mandatory to obtain the best design. In researching for the ways to improve the aerodynamic designs of vehicles, and subsequently the fuel economy, manufacturers must reduce the amount of energy needed to overcome wind resistance on the road. Pawan, et al [3] work depicts that at high speeds, about 65% of the total energy output from a truck is expended in overcoming the aerodynamic drag. This fact is partly due to the large radiator in front of the engine positioned to maximize the cooling effect of oncoming air. With the advancement of nanotechnology, the new generation of heat transfer fluids called, “Nano fluids” have been developed and researchers found that these fluids are making higher thermal conductivity compared to that of conventional coolants. Nano fluids which consist of carrier liquids such as water, ethylene glycol are dispersed with tiny nano-scale particles known as nanoparticles. Nano fluids seem to be a potential replacement for the conventional coolants in engine cooling system for automobiles. Recently there has been considerable research findings are reported, that the superior heat transfer performances of Nano fluids. Beck [4] referred that nano fluids are potential heat transfer fluids which enhances the thermo physical properties and heat transfer performance. It can be applied in many areas for better performances for energy, heat transfer and other performances. Nanofluids helps in conserving heat energy in heat exchanger material. The important parameters which influence are the heat transfer characteristics of nanofluids which include thermal conductivity,