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In the pursuit of extracting the most performance, engines are being continuously down sized and their power density continuously increased. This significantly increases the heat load on the engine for which the traditional cooling systems may not be sufficient. In the view of this fact; it is worth to explore controlled nucleate boiling to optimize engine cooling system designs. In order to utilize nucleate boiling in cooling systems, a detailed understanding of single bubble dynamics and its associated heat transfer is essential. In this work, a contact line evaporation model is developed which is then coupled to a conjugate surface to understand the individual contribution of micro layer and other sub processes towards overall heat transfer mechanism. The models use volume of fluid (VOF) interface capturing method and incorporates physics like contact line evaporation, transient conduction and bubble growth.

The increasing concern regarding diesel vehicle emissions and the rising cost of liquid diesel, leads to the need for alternative fuel. Therefore, the option of using conventional diesel engines (with appropriate modifications) as ‘dual fuel engines’; in which gaseous fuels as a supplement for the conventional diesel fuel can be used; is being pursued. When considering a gaseous fuel for use in existing diesel engines, a number of issues are important. These issues include the gas composition supplied to the engine as well as operating and design parameters. For these engines, gas interchangeability is of great significance as fuel gas composition varies from source to source. While studying the interchangeability aspect, it is necessary to formulate the relations in terms of working parameters to predict the performance of the engine.