Investigation of the bubble structure of hail droplet nuclei

Abstract

Abstract The paper is devoted to the study of the bubble structure of hail droplet nuclei at different temperatures and Nusselt numbers. On the basis of laboratory studies, equations are obtained that allow the measured values of the arithmetic mean diameter and the concentration of air inclusions in the droplet nuclei of hail to determine the temperature at which they were formed. The effect of changes in the Nusselt number on the bubble structure of hail droplet nuclei analyses in the article. The results of estimating the temperature and the Nusselt number at the level of formation of drop nuclei of natural hailstones that fell on 7.06.2012 are presented. For calculations, previously obtained data on the arithmetic mean diameter and concentration of air inclusions in the droplet nuclei of hailstones were used. The paper presents the results of comparing the formation temperatures of natural droplet nuclei calculated by formulas proposed by different authors. It is found that the difference in the temperature of the formation of droplet nuclei, calculated from the bubble structure according to Tlisov’s data and according to our data, is 2.3 °C. The maximum difference between our data and the List data is 2 °C.