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N-HEPTANE SPRAY EVAPORATION AND DISPERSION IN TURBULENT FLOW WITHIN A COMPLEX GEOMETRY CONFIGURATION

DOI: 10.1615/ICHMT.2008.CHT.970
20 pages

Mouldi Chrigui
Institute for Energy and Powerplant Technology Universität Darmstadt

A. Zghal
Laboratory of Mechanics, Solids, Structures and Technological Development, ESSTT, Tunisia

Amsini Sadiki
Institute for Energy and Powerplant Technology, Department of Mechanical Engineering, University of Darmstadt,

Johannes Janicka
Institute for Energy and Powerplant Technology, Department of Mechanical Engineering, University of Darmstadt, Petersenstr.30, 64287 Darmstadt, Germany

Abstract

Two phase flow in the frame of the Eulerian-Lagrangian method were performed to study the dispersion and evaporation of N-heptane droplets. Simulations were carried out using two different 3D-codes based on the RANS approach for the continuous phase and a tracking algorithm for droplets. The evaporation is modeled using the Uniform Temperature Model, which is appropriated for small one-component hydrocarbon droplets. The interaction between the continuous phase and evaporating droplets is considered in fully two way coupling, i.e. mass transfer, heat transfer, momentum and turbulence. The configuration consists of two parts; within the first one, droplets are supposed to disperse and evaporate in the surrounding heated air phase. The impact of turbulence on the dispersed phase is modeled by the markov-sequence dispersion model using the time and spatial correlation functions. The key and novel point in this paper is the investigation of a poly-dispersed two phase flow of a volatile one-component hydrocarbon within operating conditions similar to industrial gas turbine conditions under consideration of the dispersed phase feedback on the properties of the continuous phase fluid dynamics. The results have shown good agreements between the experimental data and the numerical simulations. Further investigations for the evaporation of multi-component fuel are required.

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