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EFFECTS OF DROPLET INITIAL CONDITIONS ON THE EVAPORATION PROCESS

DOI: 10.1615/ICHMT.2008.CHT.1840
21 pages

M. M. Abou Al-Sood
Department of Mechanical and Manufacturing Engineering, University of Manitoba, Manitoba, Canada

Abstrakt

A numerical model is developed to investigate the effect of initial conditions of droplet on the vaporization process in a turbulent convective environment at ambient pressure and temperature higher than the standard conditions. Heptane droplet with two different initial diameters, 0.1 mm and 1.5 mm, and temperatures, 253 K and 320 K, are examined. The droplet is exposed to a turbulent stream of nitrogen with a mean velocity of 2 m/s, and turbulence intensity ranging between 0 and 60%. The ambient pressure and temperature range between 0.5 MPa and 4 MPa, and 324 K and 1350 K, respectively. The numerical model solves the complete set of time-dependent conservation equation of mass, momentum, energy, and species concentration in both gas-phase and liquid-phase. The turbulence terms in the conservation equations of the gas-phase are modeled by using the shear-stress transport (SST) model. Variable thermophysical properties, gas and liquid phase transients and radiation are all accounted for. Moreover, the effect of high-pressure such as non-ideal gas behaviour, solubility of gases into droplet and pressure dependence of gas- and liquid-phase thermophysical properties are considered.

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