Evaporation of Biofuels: Surrogate Fuel Development and Modeling Strategies

Authors

Philip Haspel, MSc, Andrea Pati, MSc, Sandro Gierth, MSc, Prof. Christian Hasse, Simulation of reactive Thermo-Fluid Systems, TU Darmstadt, Darmstadt;
Prof. Stefan Will, Institute of Engineering Thermodynamics, FAU Erlangen-Nürnberg;
Prof. Andreas Paul Fröba, Institute of Advanced Optical Technologies – Thermophysical Properties, FAU Erlangen-Nürnberg;
Prof. Andreas Bräuer, Institute of Thermal-, Environmental and Resources Process Engineering, TU Bergakademie Freiberg;
Dipl.-Ing. Jérôme Munier, Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Weissach

Summary

The evaporation behavior of biofuels is significantly different from standard hydrocarbon fuels. Polar species, e.g. alcohols, introduce strong real thermodynamic effects in the fuel mixture, which has a direct impact on the evaporation behavior. Current models e.g. in state of the art commercial CFD codes cannot describe these differences. Therefore, in this study a methodology for defining suitable surrogates optimized towards realistic evaporation is presented. Further, intra-droplet transport processes as rate-limiting step are investigated both experimentally and numerically.

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