Question: In a diesel engine the fuel is injected as small droplets, and after an initial ignition delay, during which time part of the fuel vaporizes and then burns rather abruptly, the remainder of the fuel burns as fast as the fuel vaporizes from each individual droplet. The objective of this problem is to estimate the time required for complete consumption of a spherical droplet 5 I'm in diameter. During this period, let it .be assumed that the combustion chamber pressure is 6200 kPa and the air temperature is 800°C. The fuel may be idealized as C12H26, with "heat of combustion" of 44,000 kJ/kg and latent heat of vaporization 358 kJ /kg. It may be assumed that these values are relatively independent of temperature. The boiling point of the fuel is approximately 427°C at this pressure.