The study of the structure of the candle flame is discussed in the work. The optical diagnostics adapted to the study of combustion problems is based on the visualization of phase disturbances induced in the probe light field by the medium under study with using Hilbert optics and interferometry methods combined with pixel-by-pixel processing of the dynamic structure of the recorded images. The diagnostic complex is implemented on the basis of the IAB–463M device with modified blocks of optical filtration, light source, registration and information processing. The dynamic phase structure of the candle flame was visualized. The temperature was measured using thermocouples at the reference points. The phase function was restored on axisymmetric sections from the obtained hilbertograms. The temperature field of flame was reconstructed using the inverse Abel transform.
The evolution of convective structures and the phase transition induced by non-stationary boundary conditions in a horizontal water layer bounded by flat heat-exchange surfaces were studied by shear interferometry and numerical simulation methods. Numerical modeling of the temperature field as a field of isotherms in the mode of monotonous cooling of horizontal walls was performed. The problem of fragmentary reconstruction of hilbertograms and shear interferograms images from a numerical model of the isotherm field was solved. The hydrodynamics of convective currents, the coevolution of temperature fields, interference and Hilbert structures have been modeled and studied taking into account the inversion of water density in the vicinity of the isotherm (+4°C), under conditions of phase transition and growth of the ice layer on the lower heat transfer plane. The simulation was performed using a proprietary software package. The relevance of this kind of research is due to the special importance of convection in geodynamics, physics of the atmosphere and the ocean, in hydrodynamic and thermophysical processes associated with the formation and growth of crystals.
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