Experimental and Numerical Investigation on the Evaporation of Shear-Driven Multicomponent Liquid Wall Films

Author:

Gerendas M.1,Wittig S.1

Affiliation:

1. Institut fu¨r Thermische Stro¨mungsmaschinen, Universita¨t Karlsruhe, 76128 Karlsruhe, Germany

Abstract

The presented work is concerned with two-phase flows similar to those in prefilming airblast atomizers and combustors employing film vaporization. Correlations for the multicomponent mixture properties and models for the calculations of the multicomponent evaporation were implemented in a well tested elliptic finite-volume code GAP-2D (S. Wittig et al., 1992, “Motion and Evaporation of Shear-Driven Liquid Films in Turbulent Gas,” ASME J. Eng. Gas Turbines Power 114, pp. 395–400) utilizing time-averaged quantities, k,ε turbulence model, wall functions, and curve-linear coordinates in the gas phase, adiabatic or diabatic conditions at the film plate, partially turbulent velocity profile, uniform temperature, and a rapid mixing approach in the wavy film. This new code GAP-2K was tested for stability, precision, and grid independence of the results by applying it to a turbulent hot air flow over a two-component liquid film, a mixture of water and ethanol in different concentrations. Both simulations and experiments were carried out over a wide range of inlet conditions, such as inlet pressure (1–2.6 bar), inlet temperature (298–573 K), inlet air velocity (30–120 m/s), initial liquid flow rate (0.3–1.2 cm2/s), and initial ethanol concentration (20–75 percent mass). Profiles of temperature, gas velocity, and concentration of the evaporating component normal to the film, and the development of the film temperature, the static pressure, the liquid flow rate, and the liquid compound along the film plate have been measured and compared with the simulation, showing a good match.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference24 articles.

1. Sattelmayer, Th., and Wittig, S., 1986, “Internal Flow Effects in Prefilming Airblast Atomizers: Mechanisms of Atomization and Droplet Spectra,” Trans. ASME (86-GT-150).

2. Sattelmayer, Th., and Wittig, S., 1989, “Performance Characteristics of Prefilming Airblast Atomizers in Comparison with other Airblast Nozzles,” Encyclopedia of Fluid Mechanics, Vol. 8, Golf Publishing Company, Houston, pp. 1091–1141.

3. Wittig, S., Noll, B., Himmelsbach, J., Hallmann, M., and Samenfink, W., 1991, “Experimentelle und theoretische Untersuchung der Stro¨mung und des Filmverhaltens in den Saugrohren von Ottomotoren,” Forschungsvereinigung Verbrennungskraftmaschinen (FVV), Informationstagung Motoren, Heft R 463.

4. Wittig, S., Himmelsbach, J., Noll, B., Feld, H. J., and Samenfink, W., 1992, “Motion and Evaporation of Shear-Driven Liquid Films in Turbulent Gas,” ASME J. Eng. Gas Turbines Power, 114, pp. 395–400.

5. Whalley, P. B., 1987, Boiling, Condensation and Gas-Liquid Flow, Clarendon Press, Oxford.

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