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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Kinetic Modelling of Diesel Fuel Droplet Heating and Evaporation: Effects of Inelastic Collisions and Three Components

Get access (open in a dialog) DOI: 10.1615/IHTC15.tps.008860
pages 8989-9000

Sinopsis

A recently developed kinetic model, taking into account a combined effect of inelastic collisions between molecules, a non-unity evaporation coefficient and the presence of three components in a mixture, is described. The latter effect is important for the problem of heat and mass transfer in a mixture of Diesel fuel (approximated as a mixture of n-dodecane and p-dipropylbenzene) and air (approximated by nitrogen), or a mixture of Diesel fuel (approximated by n-dodecane) and air (approximated as a mixture of nitrogen and water). New functionality testing of the kinetic algorithm, taking into account the contributions of three components, is performed using two test problems: evaporation/condensation and heat transfer between two parallel plates. In contrast to the previously discussed test problems, it is assumed that Diesel fuel can be approximated by ndodecane, but air is approximated as a two component mixture of nitrogen and water. The effect of inelastic collisions is taken into account. Two cases are compared: 1) the space between two plates is filled with a mixture of n-dodecane, nitrogen and water (three component mixture); 2) the space between two plates is filled with a mixture of n-dodecane and nitrogen (two component mixture). It is shown that water produces a very small effect on the distribution of temperatures and number densities of the components in both test cases. However, the presence of water leads to a visible decrease in the mass flux of evaporating/condensing n-dodecane molecules, and an increase in the total heat flux between the plates at fixed temperatures.