DESTRUCTION OF BERNARD CELLS UNDER LOCAL IRREGULARITIES OF THERMAL EQUILIBRIUM AND THEIR FORMING OVER THE BERNARD CELLS
Results of the experiments on destruction of Bernard cells are described. Destruction of BC was conducted by two ways: micro-drop of the cooled vacuum oil, dropped on the surface of the formed Bernard cells and local change of temperature of the upper border of the layer with heated copper wire. It...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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V.N. Karazin Kharkiv National University Publishing
2015-09-01
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| Series: | East European Journal of Physics |
| Online Access: | https://periodicals.karazin.ua/eejp/article/view/4007 |
| Summary: | Results of the experiments on destruction of Bernard cells are described. Destruction of BC was conducted by two ways: micro-drop of the cooled vacuum oil, dropped on the surface of the formed Bernard cells and local change of temperature of the upper border of the layer with heated copper wire. It was offered to study the destruction of convective Bernard cells on the Sun (super-granules) as the result of quick heating of their lower border. Mathematical description of the destruction mechanism is presented. Method of calculation of volume expansion of the solar matter is presented. Value of coefficient of volume expansion was obtained which allowed decreasing the Rayleigh number of the super-granule to the value of free cell. It was shown that increase on the order of the temperature of lower boundary of the super-granule, results in the increase of Rayleigh number and as a sequence in acceleration of the solar matter. Acceleration time of the solar matter to the second orbital velocity was estimated. It constitutes 3⋅10 s, and time of solar matter outburst (eruptive flare) is about 2.23⋅103 s. Distance of solar matter outburst is about 7⋅108 m and comparable with the Sun radius. Experimental results on forming the air Bernard cells over the oil Bernard cells is described and numerically analyzed.
Correspondence of sizes of air Bernard cells to ones of oil Bernard cells is explained. |
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| ISSN: | 2312-4334 2312-4539 |