| Article | |
|---|---|
| Article name | FEATURES OF THE FREEZING PROCESS OF WATER IN POROUS MATERIALS ACCORDING TO MICROWAVE RESEARCH |
| Authors | Krylov S.. , |
| Bibliographic description | |
| Category | Earth science |
| DOI | 537.8 |
| DOI | 10.21209/2227-9245-2019-25-7-45-51 |
| Article type | scientific |
| Annotation | The studies of microwave radiation passage through porous substances, silica gels KSKG and Acros are carried out. The microwave frequency was17 GHz. Power of the microwave radiation passing through a waveguide filled with moistened silica gels in the process of cooling from room temperature to negative temperature –60 °C was measured. It has been discovered that the freezing of water in silica gelAcros starts at a lower temperature than in silica gel KSKG. The reason for this is that the pore sizes of silica gelAcros are less than pore sizes silica gelKSKG. Type of dependence of the power passing through the waveguide with silica gel from temperature has changed due to different moisture. It has been found that the power of the transmitted microwave radiation increases during the freezing of water in the pores of silica gel and the slope of the graphic dependence of power versus temperature increases with increasing moisture. The author has found out that at different moisture, due to the different ratio between the amount of water on the silica gel particles and in the pores of the particles at the same temperature, there can be two power values. There is no unambiguous relationship power –moisture. The effect of sample vibration on the passage of microwave radiation has been observed – the magnitude of the transmitted microwave radiation power has increased in the absence of vibration. |
| Key words | Key words: super cooled water; microwave radiation; porous medium;moisture;waveguide; the dielectric constant; silica gel; synchronous detection; thermocouple; thermometry |
| Article information | Krylov S. Features of the freezing process of water in porous materials according to microwave research // Transbaikal State University Journal, 2019, vol. 25, no.7, pp.45-51 |
| References | References 1. Bordonsky G.S., Krylov S.D. Zhurnal fizicheskoy khimii (Russian Journal of Physical Chemistry),2012,vol. 86, no. 11,pp. 1806–1812. 2. Angell C.A. Water: a comprehensive treatise, supercooled water (Water: a comprehensive treatise, supercooled water) / ed. Franks F. New York: Plenum, 1982, vol. 7,pp. 1–81 3. Angell С. A. Annual Review of Physical Chemistry(Annual Review of Physical Chemistry), 2004,vol. 55,pp. 559–583. 4. Chaplin M. Water Structure and Science(Water Structure and Science). URL: http://www1.lsbu.ac.uk/water/index.html (Date of access: 11.04.2019).Text: electronic. 5. Debenedetti P. G.Journal of Physics: Condensed Matter(Journal of Physics: Condensed Matter), 2003,vol. 15,no. 45,pp. R1669–R1726. 6. Debenedetti P.G., Stanley H.E. Phys. Today (Phys. Today), 2003, vol. 56,no. 6,pp. 40–46. 7. Limmer D.T., Chander D.J. Chem. Phys.(J. Chem. Phys.), 2012,vol. 137,no. 4, 044509p. 8. Mishima O., Stanley H.E. Nature (Nature), 1998,vol. 396,no. 6709,pp. 329–335. 9. Poole P.H., Sciortino F., Essmann U., Stanley H.E. Nature (Nature),1992,vol. 360,no. 6402,pp. 324–328. 10. Stanley H. Pramana (Pramana), 1999, vol. 53, no. 1, pp. 53–83. |
| Full article | FEATURES OF THE FREEZING PROCESS OF WATER IN POROUS MATERIALS ACCORDING TO MICROWAVE RESEARCH |
