Smart composite in construction Smart composite in construction Умные композиты в строительстве 2782-1919 82673 10.52957/27821919_2020_1_39 Без рубрики Uncategorized Без рубрики Transformation of a disturbed sitting drop Transformation of a disturbed sitting drop Игнатьев Алексей Александрович Ignatyev Aleksey Aleksandrovich

кандидат технических наук;

candidate of technical sciences;

 Готовцев Валерий Михайлович Gotovcev Valeriy Mihaylovich

доктор технических наук;

doctor of technical sciences;

 Российский дорожный научно-исследовательский институт Москва Россия Russian Road Research Institute Moscow Russian Federation Национальный исследовательский университет «Высшая школа экономики» National Research University Higher School of Economics Ярославский государственный технический университет Yaroslavl State Technical University 19 12 2020 19 12 2020 1 1 39 44 11 09 2020 12 10 2020 https://chemintech.ru/en/nauka/article/82673/view

The paper presents the results of a study of equilibrium of a sitting drop from the standpoint of continuum mechanics. It is shown that the connection between internal forces and interfacial tensions is formed by gradients of internal pressures of a medium in interface layers that lead to forming body forces. It was found that the shape of a sitting drop with the contact angle equal Theta_0 = 𝜋/2 is the minimum surface energy state, in which the liquid - solid interface layer is not formed, and the surface energy of the drop takes the minimum value. It was also determined that the thickness of the interface layer varies depending on the values of the contact angle and reaches a maximum value at the complete wetting and complete non-wetting. Finally, the paper examines the impact of external and internal disturbances on the shape of a sitting drop.

The paper presents the results of a study of equilibrium of a sitting drop from the standpoint of continuum mechanics. It is shown that the connection between internal forces and interfacial tensions is formed by gradients of internal pressures of a medium in interface layers that lead to forming body forces. It was found that the shape of a sitting drop with the contact angle equal Theta_0 = 𝜋/2 is the minimum surface energy state, in which the liquid - solid interface layer is not formed, and the surface energy of the drop takes the minimum value. It was also determined that the thickness of the interface layer varies depending on the values of the contact angle and reaches a maximum value at the complete wetting and complete non-wetting. Finally, the paper examines the impact of external and internal disturbances on the shape of a sitting drop.

 sitting drop interphase layer wetting angle

Kikoin A.K., Kikoin I.K. Molecular physics. M.: Nauka. 1976. 478 pp. (in Russian). Kikoin A.K., Kikoin I.K. Molecular physics. M.: Nauka. 1976. 478 pp. (in Russian). Adamson A. Physical Chemistry of Surfaces. Gast. A. New York: Wiley Interscience Publication. 1979. 784 p. Adamson A. Physical Chemistry of Surfaces. Gast. A. New York: Wiley Interscience Publication. 1979. 784 p. Frenkel Y. Kinetic theory of liquids. L.: Nauka. 1975. 301 pp. (in Russian). Frenkel Y. Kinetic theory of liquids. L.: Nauka. 1975. 301 pp. (in Russian). Roldugin V.I., Kharitonova T.V. On the nonequilibrium thermodynamics of thermocrystallization motion of inclusions in solids. Colloid. J: Sci. Magaz. 2013. V. 75. N 2. P. 198-201 (in Russia). Roldugin V.I., Kharitonova T.V. On the nonequilibrium thermodynamics of thermocrystallization motion of inclusions in solids. Colloid. J: Sci. Magaz. 2013. V. 75. N 2. P. 198-201 (in Russia). Rowlinson J.S., Widom B. Molecular Theory of Capillarity. M.: Mir. 1986. 352 p. Rowlinson J.S., Widom B. Molecular Theory of Capillarity. M.: Mir. 1986. 352 p. Rusanov A.I., Gudrich F.Ch. Modern capillarity theory: to the 100th anniversary of Gibbs ' capillarity theory. L.: Khimiya. 1980. 344 p. (in Russia). Rusanov A.I., Gudrich F.Ch. Modern capillarity theory: to the 100th anniversary of Gibbs ' capillarity theory. L.: Khimiya. 1980. 344 p. (in Russia). Loitsyanskiy L.G. Fluid and gas mechanics. M.: Nauka. 1950. 678 pp. (in Russia). Loitsyanskiy L.G. Fluid and gas mechanics. M.: Nauka. 1950. 678 pp. (in Russia). Deryagin B.V., Churaev N.V., Muller V.M. Surface forces. M.: Nauka. 1985. 398 p. (in Russia). Deryagin B.V., Churaev N.V., Muller V.M. Surface forces. M.: Nauka. 1985. 398 p. (in Russia). Kaplan I.G. Introduction to the theory of intermolecular interactions. M.: Nauka. 1982. 312 p. (in Russia). Kaplan I.G. Introduction to the theory of intermolecular interactions. M.: Nauka. 1982. 312 p. (in Russia). Vargaftik N.B. Handbook of thermophysical properties of gases and liquids. M.: Nauka. 1972. 708 p. (in Russia). Vargaftik N.B. Handbook of thermophysical properties of gases and liquids. M.: Nauka. 1972. 708 p. (in Russia). Ababneh A.. Amirfazli A., Elliott J.W. Effect of Gravity on Macroscopic Advancing Contact Angle of Sessile Drops. Canad. J. Chem. Eng. 2006. V. 84. P. 39-43. Ababneh A.. Amirfazli A., Elliott J.W. Effect of Gravity on Macroscopic Advancing Contact Angle of Sessile Drops. Canad. J. Chem. Eng. 2006. V. 84. P. 39-43. Brutin D., Zhu Q., Rahli O. Sessile drop in microgravity: creation, contact angle and interface. Micrograviti Sci. Teecnol. 2009. V. 21. N 1. P. 67-76. Brutin D., Zhu Q., Rahli O. Sessile drop in microgravity: creation, contact angle and interface. Micrograviti Sci. Teecnol. 2009. V. 21. N 1. P. 67-76. Abel G., Ross G.G., Andrzejewski L. Wetting of a liquid surface by another immiscible liquid in microgravity. Adv. Space Res. 2004. V. 33. N 8. P. 1431-1438. Abel G., Ross G.G., Andrzejewski L. Wetting of a liquid surface by another immiscible liquid in microgravity. Adv. Space Res. 2004. V. 33. N 8. P. 1431-1438. Kabov O.A. Zaitsev D.V. The effect of wetting hysteresis on drop spreading under gravity. Dokl. Akad. Nauk. 2013. V. 451. N 1. P. 37-40. Kabov O.A. Zaitsev D.V. The effect of wetting hysteresis on drop spreading under gravity. Dokl. Akad. Nauk. 2013. V. 451. N 1. P. 37-40.