C O N T E N T S

is determined. The obtained results are interested from the point of view
of modelling of processes in the stormy clouds.
Key words: renewable energy, natural convection, charge
separation, electro-hydrodynamics.
ÉTUDE D’UN ÉCOULEMENT DE CONVECTION NATURELLE
DANS UN CANAL VERTICAL CHAUFEÉASYMETRIQUEMENT
par
DAN CONSTANTIN OSPIR, STEPHANE FOHANNO, CĂTĂLIN
POPA, NELU-CRISTIAN CHERECHEŞ and CĂTĂLIN POPOVICI
Abstract. This paper deals with the experimental and numerical
study of flow in a vertical channel heated asymmetrically. The
experiments are performed for a modified Rayleigh number (Ra *)
corresponding to the boundary layer regime. The dynamic structure of
the flow is characterized via visualization techniques by using laser
tomography discrete and continuous tracers across the midline of the
channel. These results are compared with computer simulations using the
laminar model. Experimentally and numerically, an ascending boundary
layer is formed near the heated wall. This upward flow is accompanied in
both cases, by a return flow of variable length, powered by the fluid
entering through the upper channel near the unheated wall.
Key words: vertical channel, natural convection, experimental
study, numerical simulation.
MATHEMATICA MODEL FOR BURNING THE LIQUID FUEL
DROPLET IN A HOT OXIDIZING ENVIRONMENT
by
CORNELIU MOROIANU
Abstract. It was proposed a mathematical model for burning the
liquid fuel drop in a hot oxidizing environment. The model was
numerically solved by the finite element method. The droplet ignition
periods were calculated as a function of ambient temperature, oxygen
concentration, initial droplet diameter and activation energy.
Key words: droplet, burning, mathematical model