Open AccessDynamics of propagation of a self-sustained evaporation front on the flat and cylindrical heaters
Author(s) -
В. Е. Жуков,
M. I. Moiseev,
Ekaterina Slesareva
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1369/1/012050
Subject(s) - evaporation , front (military) , instability , front velocity , materials science , mechanics , convection , head (geology) , saturation (graph theory) , optics , composite material , thermodynamics , meteorology , physics , geology , mathematics , combinatorics , geomorphology
The paper presents the results of experiments on freons R21 and R114 and their mixtures. The variation range of volatile component concentration is 0 <C <1. The propagation velocity of a self-sustaining evaporation front was studied. The experiments were carried out under the conditions of free convection at a temperature of saturation. The stainless steel tubes with the diameters of 3 and 8 mm and a flat section of 25 x 50 mm were used as the working sections. The experimental results showed that in the field of development of hydrodynamic instability of a vapor front, a higher velocity of front propagation corresponds to a higher concentration of volatile component. Experiments with different heater geometry showed that dependence of the evaporation front velocity on the temperature head for a cylindrical heater with a diameter of 3 mm almost coincides with the dependence for a flat heater. In the region of temperature heads corresponding to the loss of hydrodynamic stability of the evaporation front interface, an earlier development of instability is observed on a heater with a diameter of 8 mm.