INFLUENCE OF PHYSICAL CONDITIONS ON WATER TRANSITION FROM ICE SURFACE BY THE DISPERSION MEDIUM AT LOW TEMPERATURES

• Main Authors: Veronika I. Egochina, Anatoly V. Tyagunin, Gennady D. Koposov
• Format: Article
• Language: English
• Published: Voronezh State University 2018-12-01
• Series: Конденсированные среды и межфазные границы
• Subjects: moisture transition; temperature gradient; gravitational action; sand; ice; quasi-liquid layer.
• ISSN: 1606-867X; 1606-867X

The purpose of the research was to test the possibility of using the ice surface as a generator of moisture in measuring the moisture conductivity of soils. The article presents the results of a study of the infl uence of various physical conditions on the moisture transition ice - dispersed medium at low temperatures. The experiments were carried out by weight method in the freezer with automatic temperature maintenance. To adjust the temperature, the freezer was equipped with a temperature sensor. Every day, readings of the mass of water transferred to the sample were obtained. The temperature range was chosen from -5 to -24 oC. The results of the study of the infl uence of factors such as: temperature, the presence of a temperature gradient in the direction of moisture transition, the effect of the gravitational fi eld, the presence of impurities in the ice. Samples of the dispersed medium were selected inorganic: river sand, silica gel, white soot, kaolin (white) clay. NaOH, KOH alkalis and NaCl, KCl salts were used as impurities. Impurity concentration selected (%): 3.5, 1, 0.1, 0.01, and 0.001. Two phases of the process of moisture transfer from the ice surface to the ground were identifi ed: the fi rst is associated with the movement of the diffusion fl ow; the second is associated with the transfer of moisture through the unfrozen water fi lm. The driving force of the moisture fl ow is: gravitational action; temperature gradient and concentration gradient. During the experiments, the infl uence of the selected factors on the moisture transfer of the ice –dispersed medium was revealed: 1) the greater the temperature, the greater the probability that the water molecules will be able to move in a larger volume to the ground; 2) the presence of salt contributes to the process of moisture transfer due to a decrease in the surface tension coeffi cient; 3) when certain conditions are created, the moisture transfer is carried out in the opposite direction to the ice-sand contact.