Design and Analysis of Heat Transfer of a Fully Spiral and Smooth Exhaust Gas Recirculation Cooler in a Diesel Engine.

Abstract

Currently our planet Earth is facing a severe climate change and the natural resources are consumed at a very vast rate, government strategies, technological companies and world organizations are working hard to reduce the emission of gases that are polluting our environment. The exhaust gas emission into the atmosphere is one of the major environmental concerns in the current days. The new emission standards for heavy vehicles and passenger cars cannot be able to meet with the adjustments to only engines. The major technique to limit the emission of these gases is to cooled down the exhaust gases, and the development of the means to reduce the formation of the Nitrogen Oxide (NOx). Exhaust gas recirculation cooler plays a vital role in reducing the emission of exhaust gases. In this thesis study, the heat transfer characteristics of a two different types of exhaust gas recirculation coolers, of a Fully spiral EGR cooler and Full-smooth EGR cooler were computational and experimentally carried out. The heat transfer properties of two types of EGR cooler were computationally studied using a commercial software Ansys (Fluent). Experimental and computational results show that at same flow rate of the exhaust gases EGR cooler with Spiral tubes has a better heat transfer efficiency than a cooler with smooth tubes. The pressure drop in Spiral tubes EGR cooler is higher than a smooth tubes cooler. Modification of the geometrical parameters such as Effective length, tubes diameter and Spiral pitch, revolutions, depth and thickness will result in increase in performance. This study also focuses on the effect of fouling in two different types of exhaust gas recirculation coolers, it’s effects and performance difference of the two different types of EGR coolers.