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Experimental analysis and semicontinuous simulation of low-temperature droplet evaporation of multicomponent fuels

Title data

Lehmann, Sebastian ; Lorenz, Sebastian ; Rivard, Etienne ; Brüggemann, Dieter:
Experimental analysis and semicontinuous simulation of low-temperature droplet evaporation of multicomponent fuels.
In: Experiments in Fluids. Vol. 56 (January 2015) Issue 1 .
ISSN 0723-4864
DOI: https://doi.org/10.1007/s00348-014-1871-9

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
Erweiterung und experimentelle Validierung eines Modells der kontinuierlichen Thermodynamik zur numerischen Simulation der Verdampfung mehrkomponentiger KraftstofftropfenBR – 1713/10-2

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Low-pollutant and efficient combustion not only in internal combustion engines requires a balanced gaseous mixture of fuel and oxidizer. As fuels may contain several hundred different chemical species with different physicochemical properties as well as defined amounts of biogenic additives, e.g., ethanol, a thorough understanding of liquid fuel droplet evaporation processes is necessary to allow further engine optimization. We have studied the evaporation of fuel droplets at low ambient temperature. A non-uniform temperature distribution inside the droplet was already considered by including a finite thermal conductivity in a one-dimensional radial evaporation model (Rivard and Brüggemann in Chem Eng Sci 65(18):5137–5145, 2010). For a detailed analysis of droplet evaporation, two non-laser-based experimental setups have been developed. They allow a fast and relatively simple but yet precise measurement of diameter decrease and composition change. The first method is based on collecting droplets in a diameter range from 70 to 150 µm by a high-precision scale. A simultaneous evaluation of mass increase is employed for an accurate average diameter value determination. Subsequently, a gas chromatographic analysis of the collected droplets was conducted. In the second experiment, evaporation of even smaller droplets was optically analyzed by a high-speed shadowgraphy/schlieren microscope setup. A detailed analysis of evaporating E85 (ethanol/gasoline in a mass ratio of 85 %/15 %) and surrogate fuel droplets over a wide range of initial droplet diameters and ambient temperatures was conducted. The comparison of experimental and numerical results shows the applicability of the developed model over a large range of diameters and temperatures.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: multiphase flow,
multicomponent droplet evaporation,
fuel,
shadowgraphy/schlieren imaging,
semicontinuous thermodynamics
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Research Institutions
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 18 Dec 2014 07:59
Last Modified: 18 Dec 2014 08:00
URI: https://eref.uni-bayreuth.de/id/eprint/5144