Thermal effects accompanying stationary binary condensation of vapors into overcritical droplet

Heat exchange between phases and kinetics of condensation relaxation for different regimes of droplet growth

“…9 shows the time dependences of ( ) . 4,9). This circumstance seems to be associated with the high heat conductivity of helium; the vaporgas mixture containing it was considered for the case of moderate Knudsen numbers.…”

“…As the droplet temperature rises, the growth decel eration according to formula (9) results in the elonga tion of the relaxation time, because a longer time is required to reach the total droplet surface area at which the heat release begins to influence the degree of supersaturation. The lower and upper limits of the possible temperature values are the temperature of the vapor-gas mixture and the saturation temperature, respectively.…”

“…Rather many papers have been devoted to the problem of nonisothermal nucleation, (see, e.g., [1][2][3][4][5][6][7][8]). The analytical description of weak and strong thermal effects accompanying the condensation of a pure vapor into a supercritical droplet [3] was employed to study the condensation of a binary mix ture of vapors [9]. However, because analytical meth ods were used, droplet growth regimes characterized by the limiting values of the Knudsen number were only considered in the cited works, i.e., free molecular and diffusion regimes.…”

On the evolution of a multicomponent droplet during nonisothermal diffusion growth or evaporation

“…These effects include the influence of nonsta tionary diffusion and thermal conductivity in a multi component vapor-gas medium, thermodiffusion and other cross effects [19], Stefan flux and motion of a droplet surface, and the nonideality of a solution in a droplet. Previously, these effects were partly consid ered in the analytical form for nonstationary isother mal evolution of one component and binary droplets [20][21][22][23][24][25], the stationary nonisothermal growth of a binary droplet of an ideal solution [26], and the non stationary nonisothermal growth or evaporation of a binary droplet of an ideal solution [27]. The goal of this study is to rigorously derive the most general set of equations for the size, composition, and temperature of a multicomponent nonideal solution droplet upon its diffusion nonisothermal condensation or evapora tion in a multicomponent mixture of vapors with a noncondensable carrier gas.…”