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Abstract
A high efficiency engine is based on its performance and also based on better fuel economy and less emission. By optimizing design and size of a radiator thereby reducing a vehicle Weight is a necessity for making the world green. There are several different approaches and any one of these can be taken to optimize the heat transfer performance of radiator design, include by changing the fluid. Conventional coolant fluids have inherently low thermal conductivity that greatly limits the heat exchange efficiency. In last 10 years Nano fluids have emerged as a promising substitute for conventional engine coolants. A rigorous study is going on this field for improving engine performance. The aim of the presentct work is study the methods available in the literature to enhance heat transfer rate in diesel engine radiator using Nano Fluid and suggest a novel methodology to increase it further.