Peculiarities Of Hydrodynamics In The
Evaporation Of Hydrocarbon Droplets
Author(s)
G. Miliauskas, S. Sinkunas, J. Talubinskas & K. Sinkunas
Abstract
Combustion of liquid fuel generally is going on in the sprayed form. The
combustion effectiveness is influenced by the evaporation rate of droplets, which
determine heat and mass transfer intensity between droplets and the gas and
peculiarities of combined heat spread in warming semitransparent droplets.
Modeling of complex heat transfer raises the assessment problem of the potential
liquid instability within droplets. Free liquid circulation in warming liquid
droplets can occur under the influence of Archimedes forces and forced
circulation inside them can be forced by sliding gas friction forces acting on the
droplet surface. Under the influence of these forces, droplets liquid starts to flow
on its surface and emerged vortices pass into the interior layers of the droplets.
Hydrodynamic regime of the liquid droplets determines the solution
methodology of the inner \“droplet” problem. A combined analytical and
numerical method of investigation is applied. A system of parabolic type second
order integral-differential equations describing complex heat transfer in the
droplet by conduction and radiation is transformed into an infinite series of
integral equations. Securing balance of energy fluxes in the droplet with
confidence of one hundredth of percent and using the fastest sinking the droplet
surface temperature is selected. The change of thermal state and phase
transformation intensity of warming hydrocarbons droplets heated in air is
modeled under different boundary conditions of heat and mass transfer. The
influence of forced liquid circulation on the droplet thermal state evaluated using
effective heat conduction coefficient. Free liquid circulation in the droplets is
evaluated by Rayleigh number.
Keywords: hydrocarbon droplets, combined heat and mass transfer, heating and
evaporation of droplets, hydrodynamics.
Keywords
hydrocarbon droplets, combined heat and mass transfer, heating and
evaporation of droplets, hydrodynamics
Related Book
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